Performing a regulation with two loops in parallel
Hi,
I'm using two loops running in parallel to make the regulation of a voltage through the automatic control of a motor. In the first loop I read all the time which is the value of my actual voltage. There's also a subVI inside this loop that looks if the voltage is within the specified limits and if not, calculate in which direction and which is the optimal speed of the motor to continue regulating in order to achieve the desirable value. The actual voltage, the direction of the motor and the actual speed are stored in a global variable.
On the other side I have a loop with a machine state that at the beginning initializes my motor (I control it with serial communication) and it's reading the direction and speed glob
als and sending this information always to the motor until the first loop detect that our regulation has finished, and the machine state of the second loop stops the motor, and close the serial port.
In both loops I have a Wait(ms) command, 250ms in the first one (every voltage acquisition needs about 210ms) and 100ms in the second one (I just wrote this times without no idea, just to try them).
The thing is that this program is working most of the time perfect, BUT for some reason from time to time the subVI get hanged and I have to kill LV. I don't know if my problem comes from the timing in the loops or maybe because in some cases I'm writing and reading to one of the globals at the same time and I get a collapse. Could somebody help me? If I need some kind of semaphores or syncronization issues, could you send me an example? I'm using LabVIEW 7.0.
Thanks in advance,
Angel
The technique you are using is called a functional global variable, and it's generally better programming practice than using a normal global variable. The only potential problem I see is if you are concerned about loosing data. If you just want to send the current values to the motor then you are fine, but if you need to send a command to the motor every time the values are updated then you should consider using a queue. With the functional global you still have the possibility of changing the value in the first loop twice before the second loop ever sees it, or reading it twice in the second loop before the first has had a chance to update it. If this situation wouldn't be a problem then you should be just fine.
Regards,
Ryan K.
Similar Messages
-
Problem with two parallel While loops
I have a serious problem with controlling two parallel While Loop. Here is the deal:
I have written a VI to send a series of commands called Cycle through Serial Port to a custom hardware. One of these commands is setting motor pressure by sending it's command and changing it's voltage. After setting desired pressure I have to read and control motor pressure, again through serial port in a parallel loop. There is a Pressure Sensor in system and I can obtain current's motor pressure by sending a command and receiving pressure value. In the first While loop I send some commands to hardware including Pressure Setting Command trough a state machine. In the second While Loop I read pressure value and then decide to increase motor voltage or decrease it. Now the problem is in communicating these two loops. In cycle after "Init" state when state reaches "Pressure 2 Bar" motor voltage will increase. Meanwhile I have to control this voltage in parallel While Loop. As you can see I used Local Variable to communicate between these two loops. The problem is that loops are not synchronized. Specially when I switch to "Pressure 3.8 Bar" state during cycle running control loop (second while) is still working based on "Pressure 2 Bar" state not 3.8 bar. Because of this motor pressure goes to 3.8 bar for a sec (becuase of "Pressure 3.8 Bar" state) and comes back to 2 bar (because the second while still has not gotten that new state,most probably cause of all the delays in the loop) and after couple seconds it goes back to 3.8 bar.
I really don’t know what to do. Is there a way to fix this? Or I should consider a better way to do this?
I went through Occurrence Palette but couldnt figure out how to embed that in the VI.
Sorry for my poor English. I attached VI and it's subVIs as a LLB file. I can explain more details if somebody wants.
Attachments:
QuickStartCycle.llb 197 KBI make it a point to NEVER have a WAIT function inside a state machine.
It sort of defeats the purpose, which I define as "Examine current state; decide whether you've met the conditions to advance to another state, then get out".
For example, I have a single state machine VI controlling four identical instruments, via TCP connections.
For some functions, that means issuing a command, waiting 60 seconds, then reading results.
If I waited INSIDE the state machine, then it's tied up waiting on one device and cannot handle any others.
Not a good plan.
To handle this, I have a loop which calls the state machine. After issuing the command, the state goes to "Waiting on Response", and there is a target time of 60 seconds from now.
It's called over and over in that state, and each time merely compares NOW to the target time. If NOW is past the target, then we read the results.
the state machine can tell the caller when to call back; that's how I distinguish between an urgent need and nothing-to-do.
By having the CALLER do the waiting, instead of the state machine itself, the state machine is free to handle another device, or do something else on the same device.
You should be calling the state machine over and over and over anyway. So, have the state machine "control the pressure" on every call, and THEN examine whatever state it's in.
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks -
Threads in while loop with two data acq loops
Good day, I am using two while loops to perform data acquisition from two different pieces of hardware inside a "main" while loop - a total of three while loops. I want each of the data acq loops to run as fast as possible. With this model will each data acq loop run in a separate thread or will they be running in the same thread because they are both inside the "main" while loop.
I'm not getting the performance I would like and I'm looking at ways to optimize the execution.
Thanks
JohnI would have a loop for each of you data acquisition tasks and at least one, possibly two additional loops that will write your data to file. Let the acquisition loops collect the data as quickly as possible and simply queue it off for further processing. When these loops are in parallel LabVIEW will run them on separate threads. In addition you could have a separate loop with an event structure that could handle you UI interaction. This loop could control the overall application with respect to starting and stopping the tasks, etc. You don't really need to contain all these loops in any other loop or structure. They can all reside on the block diagram next to each other. Ideally you will create subVIs for the data acquision and data processing tasks.
Message Edited by Mark Yedinak on 10-06-2009 04:29 PM
Mark Yedinak
"Does anyone know where the love of God goes when the waves turn the minutes to hours?"
Wreck of the Edmund Fitzgerald - Gordon Lightfoot -
FPGA - Synchronization between two loops with different loop rates.
Hi all,
I am trying to implement an Analog and Quadrature Decoder. Simply put, I have two loops: LOOP 1 with an Analog Input (AI) which is a slower loop rate. Another loop: LOOP 2 has a digital input (input) and counts the Quadrature counts. I understand that Analog conversion is slower, and as a result, LOOP 1 will have a slower higher tick rate. I want to pass the "counts" from LOOP 2 into LOOP1, so that I can synchronize the Analog Input with the number of quadrature counts. My issue at hand is: since LOOP 2 updates at a higher rate. Will the "counts" value that I pass/tunnel from LOOP 2 to LOOP 1 refresh at the LOOP 2's rate or at LOOP 1's rate.
Thanks,
Herrick Changhlchang wrote:
Hi all,
I am trying to implement an Analog and Quadrature Decoder. Simply put, I have two loops: LOOP 1 with an Analog Input (AI) which is a slower loop rate. Another loop: LOOP 2 has a digital input (input) and counts the Quadrature counts. I understand that Analog conversion is slower, and as a result, LOOP 1 will have a slower higher tick rate. I want to pass the "counts" from LOOP 2 into LOOP1, so that I can synchronize the Analog Input with the number of quadrature counts. My issue at hand is: since LOOP 2 updates at a higher rate. Will the "counts" value that I pass/tunnel from LOOP 2 to LOOP 1 refresh at the LOOP 2's rate or at LOOP 1's rate.
Thanks,
Herrick Chang
The only way to pass values between two parallel loops is by some sort of global variable (global or locals are fine, as are shared variables although I wouldn't recommend that for FPGA if you don't want to go outside of the FPGA target at all). Don't tunnel anything between two independant loops as they won't be independant anymore.
The local variable will be updated at the rate the writing loop updates it, though your slower read loop will obviously not see every value. Note that the FPGA compiler will protect the local variable access in both loops in order to avoid race conditions. This protection is necessary but expensive in terms of runtime performance of each loop as well as FPGA gate usage.
Rolf Kalbermatter
Rolf Kalbermatter
CIT Engineering Netherlands
a division of Test & Measurement Solutions -
How can I transfer data between two while loops in parallel
Hello,
I have two while loops in parallel and I want to transfer data from the first to the second loop. The problem isthat data are transfered only when the first loop ends. I tried with queue but it doesn't work. How can I do, preferentially without global variable ?
Thanks.I join a very simplified VI's because the real works with PXI, RT, ...
When you run the "secondVI.vi", no data comes in array from the "firstVI.vi".
As I said in my first message, I tried with queue too but it doesn't work, because when the terminal go out from the while loop, while loop have to be ended to send data.
Attachments:
transfer_data.zip 20 KB -
LabVIEW array performance: Two loops operating on the same massive array
Yes there has been a lot said and left unsaid about LabVIEW performance in the past - but I have to ask the following:
Is it possible to have two seperate while loops act on the same data without making copies?
Say I have a 1GB array of doubles which I have wired to a shift register on one loop. With a little bit of effort (by using in-place and chasing the dots a bit) it would be possible to operate on that data inside that loop without making copies.
But what if I need to also access that same array in a different loop (which is running at a different rate). I basically need two loops' shift registers to point to the same data. At the moment the only way I can manage this is to use DLL calls which destroys dataflow but al least makes no copies. It also means I cannot use LabVIEW code but have to resort to C coding.
Data corruption is no issue as the two loops, at any instant, operate in different locations of the array.
Any smart ideas that will work?drclaw wrote:
Hi AnthonV,
A Functional Global approach might suit your needs. This will allow you to keep you data in a shift register, but access/modify parts of the data from other VIs or loops.
Another option is to use a single element queue to store the array to achieve a similar result.
Both these options and more techniques are located at
http://zone.ni.com/devzone/cda/tut/p/id/3625#toc0
Hope that helps
Good suggestion. Functional Globals also go by the name "Action Engine" as I discuss in this Nugget on Action Engines.
Put all of your number crunching code inside appropriately named Actions of the AE and that way all of the work CAN be done "in-place".
Have fun!
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction -
How to build a table with two For Loop
Hi,
I have two Loop For and I want to build a table with N columm (N = a loop + b loop)
You can see my example.
Thank's a lot
Attachments:
help_table.zip 10 KBI think this is the solution that you are going for.
-Jim
Attachments:
help_table.vi 26 KB -
Exchange rates with two parallel currencies
Hi all,
I need to manage a company with two parallel currencies (USD and PKR). To post a document in USD it's necessary to define in TCURR an exchange rate FROM USD to PKR, and to post a document in PKR it's necessary to have an entry FROM PKR to USD.
Obviously the second exchange rate has to be the multiplicative inverse of the first one.
For this reason, to avoid redundant and possibly wrong entries, is it possible to manage only one exchange rate in TCURR (for example FROM USD to PKR) instead of two? How?
Thanks for your attentionGo to SAP Netweaver> General Settings> Currencies and manipulate the following and you should be able to maintain only one set of exchange rates.
i) go to Check Exchange Rate Type - and manipulate the exchange rate type you are using (Check Financial Accounting Basic settings> Ledgers> Define Currencies for Leading Ledger to check the exchange rate type used for each company code - generally M is used) and assign Reference Currency "Ref.crcy" (for example we use USD) for that exchange rate type.
ii) go to Define Stnadrd Quotation for Exchange Rates and maintain - Forexample we use "Blank" to "USD", so that we just have to maintain Other currencies to USD (ref.crcy) and in In-direct Quotation.
These setting would give you the ability to maintain just "Other Currencies" to "USD" in in-direct quotaion. Use this example to decide which currency you want to use as reference currency and then maintain accordingly.
Hope this helps. -
Can we perform two actions with one button with two clicks one after other?
Sir,
can we perform two actions with one button with two clicks one after other?
I want that when I click an Add Button first time it add data to the database and when I click again this button it clear the form data to empty fields.
Regards
TanvirIn code it should be easy.
The following code adds a button called butman with a text "ADD".
It then registers a listener that will be called if the button is clicked.
This listener then calls the runAddData method if you clicked on butman while it contained the "ADD" text and it will call the runClearData method otherwise.
Therefore it will swap the button's functionality between ADD and CLEAR on every click.
final Button butman = new Button("ADD");
butman.setOnAction(new EventHandler<ActionEvent>() {
@Override
public void handle(ActionEvent t) {
if (butman.getText().equals("ADD")) {
butman.setText("CLEAR");
runAddData();
} else {
butman.setText("ADD");
runClearData();
} // END IF-THEN
}});I hope this is what you wanted.
Some extra food for thought.
You might want to run the ADD and CLEAR methods in their own threads so that it can run in the back ground, without slowing down your user interface.
I also like to rather reuse one button for multiple functionality in stead of making an application with hundreds of nodes only used rarely with masses of code to show and hide them if needed. -
Demantra - can it run with two Data Models in parallel?
Hello,
we face the following situation: we have items that have to planned on a daily basis; many other items, however, only need weekly planning.
Demantra only allows one base time unit in its data model. If we choose "daily" for all products, the system size will increase enormously.
If we choose "weekly" for all products, we can not plan our daily products for specific days in the week.
The idea is now to set up a Demantra System with two data models in parallel. Is this possible? Would they reside in different databases or database users?
The Business Modeller allows to create new models, but can they run in parallel? If they can, how would the user access the different data models?
Thanks for any hints on this!Can you please elaborate on this issue?
Thanks -
Hi I hope someone can help me?
I have these two loops, which at the moment prints out like this
addr1, id, phone, lastname, firstname
town, addr2, postcode, county, country
[7,4,2,1,0]
[9,8,6,5,3]
the first two lines is what vector vv2 holds inside it.
the second two line is what vector vv holds inside it.
my problem is how can i get it to printout like this?
[7,4,2,1,0]
addr1, id, phone, lastname, firstname
[9,8,6,5,3]
town, addr2, postcode, county, country
I hope someone can help me thanks
nicky
for (int ii2=0;ii2 < results2.size(); ii2++) {
vv2 = (Vector)results2.elementAt(ii2);
ste2 = vv2.toString();
stb2 = new StringBuffer(ste2);
stb12 = new StringBuffer();
int is = stb2.length();
int is2 = is-2;
int is3 = is-1;
stb2.replace(0,1,"");
stb2.replace(is2,is3,"");
for(int i222 = 0; i222 < vv2.size(); i222++){
stb12.append(",");
stb12.append("?");
stb12.replace(0,1,"");
System.out.println(stb2);
for (int ii = 0; ii < results.size(); ii++) {
vv = (Vector)results.get(ii);
System.out.println(vv);
}You are using more for loops than you need to. If you just want to print out the element of one vector after the other then just put it in the same loop. Here try this:
for (int ii2=0;ii2 < results2.size(); ii2++) {
vv2 = (Vector)results2.elementAt(ii2);
ste2 = vv2.toString();
stb2 = new StringBuffer(ste2);
stb12 = new StringBuffer();
int is = stb2.length();
int is2 = is-2;
int is3 = is-1;
stb2.replace(0,1,"");
stb2.replace(is2,is3,"");
for(int i222 = 0; i222 < vv2.size(); i222++){
stb12.append(",");
stb12.append("?");
stb12.replace(0,1,"");
System.out.println(stb2);
vv = (Vector)results.get(ii2);
System.out.println(vv);
And for god sakes man use some better names for your for loop iterator. Usually it is custom to start with i and if you need an inner for loop or another for loop within the same scope move on to using j and then k, so on and so on. All those numbers in your variables make the code harder to read than it needs to be. Just a suggestion, good luck. -
How do I run one vi that has a continuous loop in parallel with other vi�s
I am currently attempting to run one vi that has a continuous
loop in parallel with other vi’s. When I
run the program it hangs up in the continuous loop vi and does not execute any
other steps in the program. The loop vi
is for temperature checking, control and recording once it reaches a certain temperature
gradient. The other vi’s are for other functions
like pressure readings and flow rates, for example.
Where am I going wrong and what can I do to fix this
problem. Thank you for your time and
help.Here is a zip file with the vi in question. The
spraycooling6 and the TempStep5 both run fine alone but when I add the TempStep
to the Spraycooling6 it only runs the TempStep and hangs up the program.
I'm new to LabView and know that the code is probably not optimized for some
functions. In addition, this is still a work in progress for me so this is
not the final vi. Again, thank you for you time and input I
appreciate it.
Attachments:
Spraycooling6.zip 137 KB -
Requirement wherein I want to call two queries in parallel using ABAP Prg
We are using RSCRM_BAPI to run a query in background and write the results to a table. We later read this table and create a file. I have a requirement u2013 wherein I want to call two queries in parallel using an ABAP program.
For our discussion assume:
1) Program : ZCALL_RCRMBAPI is a program that calls RSCRM_BAPI in background and takes the query name as input
2) Program: ZMAIN_PROGRAM this is the main program
The requirement is to call the ZCALL_RCRMBAPI in a loop. Also within the loop call it in parallel. Basically we have an ODS that stores ; FISCPER. So I call the two queries for a list of FISCPER.
ZMAIN_PROGRAM - A program that reads a table (ODS ) in our case and call the two programs in a loop and both should run in parallel .
Now if it was sequential u2013 it was easy u2013 I would just say
Loop at L_T_FISCPER .
Update Z_FISCPER with L_T_FISCPER-FISCPER u201C Assume Z_FISCPER is a Z table . The VARIABLE in the query Q1 and Q2 use a customer exit to read this table.
A) SUBMIT ZCALL_RCRMBAPI with P_QUERy = Q1 and return .
B) SUBMIT ZCALL_RCRMBAPI with P_QUERy = Q2 and return .
Endloop .
Question: How do I make these calls in parallel u2013 yet retain control in the main program?
A) SUBMIT ZCALL_RCRMBAPI with P_QUERy = Q1 and return .
B) SUBMIT ZCALL_RCRMBAPI with P_QUERy = Q2 and return .Instead of RSCRM BAPI you can use the RRW3_QUERY_VIEW_DATA function module for greater control over program execution...
/people/arun.varadarajan/blog/2009/07/29/make-the-most-out-of-query-execution--part-1
will give you pointers as to how this can be done... -
Election problem after repeated split-brains with two nodes
Hi
I'm using a customized source based on BDB-5.1.19 (excxx_repquote)
with two site one - MASTER and the other SLAVE...
nsite=2
ack=quorum
- the master is writing to quotedb at a rate of 10 txn per sec
- the test consist to isolate the client from the master (split brain) and reconnect it after a random time include from 1sec to 10sec
the test run well about 10 times but at a moment the process slave receive DB_EVENT_REP_ELECTION_FAILED
and the master enter in election mode and never exit from the CLIENT mode. I must say that to freeze the client I decide to kill me (kill -9 my pid) when I receive such event...
here is the verbose log on the master...
[1307872770:871621][6510/47655809107168] MASTER: rep_send_function returned: 110
[1307872770:973655][6510/47655809107168] MASTER: bulk_msg: Send buffer after copy due to PERM
[1307872770:973667][6510/47655809107168] MASTER: send_bulk: Send 266 (0x10a) bulk buffer bytes
[1307872770:973672][6510/47655809107168] MASTER: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 68 eid -1, type bulk_log, LSN [21][986648] perm
[1307872770:973693][6510/47655809107168] MASTER: will await acknowledgement: need 1
[1307872771:26623][6510/47655809107168] MASTER: rep_send_function returned: 110
[1307872771:126380][6510/1162996032] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 70 eid 0, type log, LSN [21][946345]
[1307872771:126407][6510/1162996032] MASTER: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 68 eid -1, type dupmaster, LSN [0][0] nobuf
[1307872771:126695][6510/1162996032] MASTER: rep_start: Found old version log 17
[1307872771:126753][6510/1162996032] CLIENT: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 68 eid -1, type newclient, LSN [0][0] nobuf
[1307872771:126833][6510/1183975744] CLIENT: starting election thread
[1307872771:126876][6510/1183975744] CLIENT: Start election nsites 2, ack 1, priority 100
[1307872771:126890][6510/1183975744] CLIENT: Election thread owns egen 69
[1307872771:127423][6510/1173485888] CLIENT: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 70 eid 0, type newclient, LSN [0][0]
[1307872771:130079][6510/1183975744] CLIENT: Tallying VOTE1[0] (2147483647, 69)
[1307872771:130113][6510/1183975744] CLIENT: Beginning an election
[1307872771:130134][6510/1183975744] CLIENT: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 68 eid -1, type vote1, LSN [21][986728] nobuf
[1307872771:130147][6510/1173485888] CLIENT: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 68 eid -1, type master_req, LSN [0][0] nobuf
[1307872771:130438][6510/1152506176] CLIENT: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 70 eid 0, type vote1, LSN [21][946437]
[1307872771:130460][6510/1162996032] CLIENT: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 70 eid 0, type alive, LSN [21][986728]
[1307872771:130467][6510/1152506176] CLIENT: Updating gen from 68 to 70
[1307872771:130482][6510/1162996032] CLIENT: Received ALIVE egen of 71, mine 69
[1307872771:130503][6510/1162996032] CLIENT: Election finished in 0.003602000 sec
[1307872771:130515][6510/1162996032] CLIENT: Election done; egen 70
[1307872771:130534][6510/1152506176] CLIENT: Received vote1 egen 71, egen 71
[1307872771:130581][6510/1152506176] CLIENT: Tallying VOTE1[0] (0, 71)
[1307872771:130593][6510/1089075520] CLIENT: starting election thread
[1307872771:130619][6510/1152506176] CLIENT: Incoming vote: (eid)0 (pri)100 ELECTABLE (gen)70 (egen)71 [21,946437]
[1307872771:130642][6510/1152506176] CLIENT: Not in election, but received vote1 0x282c 0x8
[1307872771:130674][6510/1089075520] CLIENT: Start election nsites 2, ack 1, priority 100
[1307872771:130692][6510/1089075520] CLIENT: Election thread owns egen 71
[1307872771:130704][6510/1194465600] CLIENT: starting election thread
[1307872771:130733][6510/1194465600] CLIENT: Start election nsites 2, ack 1, priority 100
[1307872771:132922][6510/1089075520] CLIENT: Tallying VOTE1[1] (2147483647, 71)
[1307872771:132949][6510/1089075520] CLIENT: Accepting new vote
[1307872771:132958][6510/1089075520] CLIENT: Beginning an election
[1307872771:132973][6510/1089075520] CLIENT: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 70 eid -1, type vote1, LSN [21][986728] nobuf
[1307872771:132985][6510/1194465600] CLIENT: election thread is exiting
[1307872771:133012][6510/1089075520] CLIENT: Tallying VOTE2[0] (2147483647, 71)
[1307872771:133037][6510/1089075520] CLIENT: Counted my vote 1
[1307872771:133048][6510/1089075520] CLIENT: Skipping phase2 wait: already got 1 votes
[1307872771:133060][6510/1089075520] CLIENT: Got enough votes to win; election done; (prev) gen 70
[1307872771:133071][6510/1089075520] CLIENT: Election finished in 0.002367000 sec
[1307872771:133084][6510/1089075520] CLIENT: Election done; egen 72
[1307872771:133111][6510/1089075520] CLIENT: Ended election with 0, e_th 1, egen 72, flag 0x2a2c, e_fl 0x0, lo_fl 0x6
[1307872771:133170][6510/1173485888] CLIENT: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 70 eid 0, type alive, LSN [0][0]
[1307872771:133187][6510/1173485888] CLIENT: Racing replication msg lockout, ignore message.
[1307872771:173744][6510/1162996032] CLIENT: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 70 eid 0, type vote2, LSN [0][0]
[1307872771:173769][6510/1162996032] CLIENT: Racing replication msg lockout, ignore message.
[1307872771:231593][6510/1183975744] CLIENT: Ended election with 0, e_th 0, egen 72, flag 0x2a2c, e_fl 0x0, lo_fl 0x1c
[1307872771:231629][6510/1183975744] CLIENT: election thread is exiting
[1307872777:443794][6510/1131526464] CLIENT: init connection to site 2.0.0.210:12345 with result 115
[1307872971:644194][6510/1131526464] CLIENT: init connection to site 2.0.0.210:12345 with result 115
[1307873165:844583][6510/1131526464] CLIENT: init connection to site 2.0.0.210:12345 with result 115
[1307873360:44955][6510/1131526464] CLIENT: init connection to site 2.0.0.210:12345 with result 115
[1307873554:245347][6510/1131526464] CLIENT: init connection to site 2.0.0.210:12345 with result 115
[1307873748:445736][6510/1131526464] CLIENT: init connection to site 2.0.0.210:12345 with result 115
[1307873942:646117][6510/1131526464] CLIENT: init connection to site 2.0.0.210:12345 with result 115
[1307874136:846509][6510/1131526464] CLIENT: init connection to site 2.0.0.210:12345 with result 115
.... and infinite stay to this situation
My question is why the Master is suddenly transformed into CLIENT and why it's never returning to the MASTER
Thanks in advance ...
here is the log for the client
[1307872315:455113][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type log, LSN [21][984396]
[1307872315:455134][1282/1160603968] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type log, LSN [21][984483] perm
[1307872315:609962][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type bulk_log, LSN [21][984733] perm
[1307872315:764958][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type bulk_log, LSN [21][984986] perm
[1307872315:919962][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type bulk_log, LSN [21][985238] perm
[1307872316:75018][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type bulk_log, LSN [21][985491] perm
[1307872316:229959][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type bulk_log, LSN [21][985741] perm
[1307872316:384949][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type bulk_log, LSN [21][985993] perm
[1307872316:499899][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type bulk_log, LSN [21][986141] perm
[1307872316:539895][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type log, LSN [21][986221]
[1307872316:540078][1282/1171093824] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type log, LSN [21][986307]
[1307872316:540100][1282/1160603968] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type log, LSN [21][986394] perm
[1307872316:694950][1282/1171093824] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type bulk_log, LSN [21][986648] perm
[1307872316:847349][1282/1129134400] MASTER: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 70 eid -1, type log, LSN [21][946345]
[1307872316:847698][1282/1171093824] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type dupmaster, LSN [0][0]
[1307872316:847999][1282/1181583680] MASTER: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type newclient, LSN [0][0]
[1307872316:848168][1282/1171093824] MASTER: rep_start: Found old version log 17
[1307872316:848222][1282/1181583680] CLIENT: Racing replication msg lockout, ignore message.
[1307872316:848398][1282/1171093824] CLIENT: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 70 eid -1, type newclient, LSN [0][0] nobuf
[1307872316:848504][1282/1192073536] CLIENT: starting election thread
[1307872316:848542][1282/1192073536] CLIENT: Start election nsites 2, ack 1, priority 100
[1307872316:848566][1282/1192073536] CLIENT: Election thread owns egen 71
[1307872316:849634][1282/1192073536] CLIENT: Tallying VOTE1[0] (2147483647, 71)
[1307872316:849654][1282/1192073536] CLIENT: Beginning an election
[1307872316:849680][1282/1192073536] CLIENT: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 70 eid -1, type vote1, LSN [21][946437] nobuf
[1307872316:851403][1282/1160603968] CLIENT: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type vote1, LSN [21][986728]
[1307872316:851448][1282/1160603968] CLIENT: Received vote1 egen 69, egen 71
[1307872316:851470][1282/1160603968] CLIENT: Received old vote 69, egen 71, ignoring vote1
[1307872316:851481][1282/1160603968] CLIENT: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 70 eid 0, type alive, LSN [21][986728] nobuf
[1307872316:851538][1282/1171093824] CLIENT: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 68 eid 0, type master_req, LSN [0][0]
[1307872316:851558][1282/1171093824] CLIENT: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 70 eid 0, type alive, LSN [0][0] nobuf
[1307872316:854254][1282/1160603968] CLIENT: /opt/bdb/ rep_process_message: msgv = 5 logv 17 gen = 70 eid 0, type vote1, LSN [21][986728]
[1307872316:854275][1282/1160603968] CLIENT: Received vote1 egen 71, egen 71
[1307872316:854317][1282/1160603968] CLIENT: Tallying VOTE1[1] (0, 71)
[1307872316:854339][1282/1160603968] CLIENT: Incoming vote: (eid)0 (pri)100 ELECTABLE (gen)70 (egen)71 [21,986728]
[1307872316:854353][1282/1160603968] CLIENT: Existing vote: (eid)2147483647 (pri)100 (gen)70 (sites)2 [21,946437]
[1307872316:854369][1282/1160603968] CLIENT: Accepting new vote
[1307872316:854379][1282/1160603968] CLIENT: Phase1 election done
[1307872316:854395][1282/1160603968] CLIENT: Voting for 0
[1307872316:854407][1282/1160603968] CLIENT: /opt/bdb/ rep_send_message: msgv = 5 logv 17 gen = 70 eid 0, type vote2, LSN [0][0] nobuf
[1307872317:960344][1282/1192073536] CLIENT: After phase 2: votes 0, nvotes 1, nsites 2
[1307872317:960389][1282/1192073536] CLIENT: Election finished in 1.111809000 sec
[1307872317:960401][1282/1192073536] CLIENT: Election done; egen 72
[1307872317:960412][1282/1192073536] CLIENT: Ended election with -30974, e_th 0, egen 72, flag 0x282c, e_fl 0x0, lo_fl 0x0
Kill me !!
--- my source
on the master I run manually :
txn_rate 1
loop_rate 10
loop 1 20000
* See the file LICENSE for redistribution information.
* Copyright (c) 2001, 2010 Oracle and/or its affiliates. All rights reserved.
* $Id$
* In this application, we specify all communication via the command line. In
* a real application, we would expect that information about the other sites
* in the system would be maintained in some sort of configuration file. The
* critical part of this interface is that we assume at startup that we can
* find out
* 1) what our Berkeley DB home environment is,
* 2) what host/port we wish to listen on for connections; and
* 3) an optional list of other sites we should attempt to connect to.
* These pieces of information are expressed by the following flags.
* -h home (required; h stands for home directory)
* -l host:port (required; l stands for local)
* -C or -M (optional; start up as client or master)
* -r host:port (optional; r stands for remote; any number of these may be
* specified)
* -R host:port (optional; R stands for remote peer; only one of these may
* be specified)
* -a all|quorum (optional; a stands for ack policy)
* -b (optional; b stands for bulk)
* -n nsites (optional; number of sites in replication group; defaults to 0
* to try to dynamically compute nsites)
* -p priority (optional; defaults to 100)
* -v (optional; v stands for verbose)
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <string>
#include <sstream>
#include <sys/types.h>
#include <signal.h>
#include <db_cxx.h>
#include "RepConfigInfo.h"
#include "dbc_auto.h"
using std::cout;
using std::cin;
using std::cerr;
using std::endl;
using std::ends;
using std::flush;
using std::istream;
using std::istringstream;
using std::ostringstream;
using std::string;
using std::getline;
#include <stdio.h>
#include <readline/readline.h>
#include <readline/history.h>
#define CACHESIZE (10 * 1024 * 1024)
#define DATABASE "quote.db"
#define DATABASE2 "quote2.db"
const char *progname = "excxx_repquote";
#include <errno.h>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#define snprintf _snprintf
#define sleep(s) Sleep(1000 * (s))
extern "C" {
extern int getopt(int, char * const *, const char *);
extern char *optarg;
typedef HANDLE thread_t;
typedef DWORD thread_exit_status_t;
#define thread_create(thrp, attr, func, arg) \
(((*(thrp) = CreateThread(NULL, 0, \
(LPTHREAD_START_ROUTINE)(func), (arg), 0, NULL)) == NULL) ? -1 : 0)
#define thread_join(thr, statusp) \
((WaitForSingleObject((thr), INFINITE) == WAIT_OBJECT_0) && \
GetExitCodeThread((thr), (LPDWORD)(statusp)) ? 0 : -1)
#else /* !_WIN32 */
#include <pthread.h>
typedef pthread_t thread_t;
typedef void* thread_exit_status_t;
#define thread_create(thrp, attr, func, arg) \
pthread_create((thrp), (attr), (func), (arg))
#define thread_join(thr, statusp) pthread_join((thr), (statusp))
#endif
// Struct used to store information in Db app_private field.
typedef struct {
bool app_finished;
bool in_client_sync;
bool is_master;
bool no_dummy_wr;
} APP_DATA;
static void log(const char *);
void checkpoint_thread (void );
void log_archive_thread (void );
void dummy_write_thread (void );
class RepQuoteExample {
public:
RepQuoteExample();
void init(RepConfigInfo* config);
void doloop();
int terminate();
static void event_callback(DbEnv* dbenv, u_int32_t which, void *info);
void print_stocks_size(Db *dbp);
private:
// disable copy constructor.
RepQuoteExample(const RepQuoteExample &);
void operator = (const RepQuoteExample &);
// internal data members.
APP_DATA app_data;
RepConfigInfo *app_config;
DbEnv cur_env;
thread_t ckp_thr;
thread_t lga_thr;
thread_t dmy_thr;
// private methods.
void print_stocks(Db *dbp);
void print_env(DbEnv *dbenv);
void prompt();
RepQuoteExample *g_runner=NULL;
RepConfigInfo *g_config=NULL;
class DbHolder {
public:
DbHolder(DbEnv env, const char _dbname) : env(env)
dbp = 0;
if (_dbname) dbname=_dbname;
else dbname=DATABASE;
~DbHolder() {
try {
close();
} catch (...) {
// Ignore: this may mean another exception is pending
bool ensure_open(bool creating) {
if (dbp)
return (true);
dbp = new Db(env, 0);
u_int32_t flags = DB_AUTO_COMMIT;
if (creating)
flags |= DB_CREATE;
try {
//dbp->open(NULL, DATABASE, NULL, DB_BTREE, flags, 0);
//dbp->open(NULL, dbname, NULL, DB_BTREE, flags, 0);
dbp->open(NULL, NULL, dbname, DB_BTREE, flags, 0);
return (true);
} catch (DbDeadlockException e) {
} catch (DbRepHandleDeadException e) {
} catch (DbException e) {
if (e.get_errno() == DB_REP_LOCKOUT) {
// Just fall through.
} else if (e.get_errno() == ENOENT && !creating) {
// Provide a bit of extra explanation.
log("Stock DB does not yet exist");
} else
throw;
// (All retryable errors fall through to here.)
log("please retry the operation");
close();
return (false);
void close() {
if (dbp) {
try {
dbp->close(0);
delete dbp;
dbp = 0;
} catch (...) {
delete dbp;
dbp = 0;
throw;
operator Db *() {
return dbp;
Db *operator->() {
return dbp;
private:
Db *dbp;
DbEnv *env;
const char *dbname;
class StringDbt : public Dbt {
public:
#define GET_STRING_OK 0
#define GET_STRING_INVALID_PARAM 1
#define GET_STRING_SMALL_BUFFER 2
#define GET_STRING_EMPTY_DATA 3
int get_string(char **buf, size_t buf_len)
size_t copy_len;
int ret = GET_STRING_OK;
if (buf == NULL) {
cerr << "Invalid input buffer to get_string" << endl;
return GET_STRING_INVALID_PARAM;
// make sure the string is null terminated.
memset(*buf, 0, buf_len);
// if there is no string, just return.
if (get_data() == NULL || get_size() == 0)
return GET_STRING_OK;
if (get_size() >= buf_len) {
ret = GET_STRING_SMALL_BUFFER;
copy_len = buf_len - 1; // save room for a terminator.
} else
copy_len = get_size();
memcpy(*buf, get_data(), copy_len);
return ret;
size_t get_string_length()
if (get_size() == 0)
return 0;
return strlen((char *)get_data());
void set_string(char *string)
set_data(string);
set_size((u_int32_t)strlen(string));
StringDbt(char *string) :
Dbt(string, (u_int32_t)strlen(string)) {};
StringDbt() : Dbt() {};
~StringDbt() {};
// Don't add extra data to this sub-class since we want it to remain
// compatible with Dbt objects created internally by Berkeley DB.
Db *g_repquote=NULL;
RepQuoteExample::RepQuoteExample() : app_config(0), cur_env(0) {
app_data.app_finished = 0;
app_data.in_client_sync = 0;
app_data.is_master = 0; // assume I start out as client
app_data.no_dummy_wr = 0 ; //prevent to run dummy write
int (*old_rep_process_message)
__P((DB_ENV *, DBT *, DBT *, int, DB_LSN *));
int my_rep_process_message __P((DB_ENV arg1, DBT arg2, DBT arg3, int arg4, DB_LSN arg5))
printf("EZ->>> my_rep_process_message:%p\n",arg5);
old_rep_process_message(arg1,arg2,arg3,arg4,arg5);
void RepQuoteExample::init(RepConfigInfo *config) {
app_config = config;
cur_env.set_app_private(&app_data);
cur_env.set_errfile(stderr);
app_data.no_dummy_wr=config->no_dummy_wr;
if (app_data.no_dummy_wr)
printf("No dummy !!!\n");
//EZ->cur_env.set_errpfx(progname);
cur_env.set_event_notify(event_callback);
// Configure bulk transfer to send groups of records to clients
// in a single network transfer. This is useful for master sites
// and clients participating in client-to-client synchronization.
if (app_config->bulk)
cur_env.rep_set_config(DB_REP_CONF_BULK, 1);
// Set the total number of sites in the replication group.
// This is used by repmgr internal election processing.
if (app_config->totalsites > 0)
cur_env.rep_set_nsites(app_config->totalsites);
// Turn on debugging and informational output if requested.
if (app_config->verbose)
cur_env.set_verbose(DB_VERB_REPLICATION, 1);
cur_env.set_verbose(DB_VERB_REPMGR_MISC, 1);
cur_env.set_verbose(DB_VERB_RECOVERY, 1);
cur_env.set_verbose(DB_VERB_REPLICATION, 1);
cur_env.set_verbose(DB_VERB_REP_ELECT, 1);
cur_env.set_verbose(DB_VERB_REP_LEASE, 1);
cur_env.set_verbose(DB_VERB_REP_SYNC, 1);
cur_env.set_verbose(DB_VERB_REPMGR_MISC, 1);
// Set replication group election priority for this environment.
// An election first selects the site with the most recent log
// records as the new master. If multiple sites have the most
// recent log records, the site with the highest priority value
// is selected as master.
cur_env.rep_set_priority(app_config->priority);
// Set the policy that determines how master and client sites
// handle acknowledgement of replication messages needed for
// permanent records. The default policy of "quorum" requires only
// a quorum of electable peers sufficient to ensure a permanent
// record remains durable if an election is held. The "all" option
// requires all clients to acknowledge a permanent replication
// message instead.
cur_env.repmgr_set_ack_policy(app_config->ack_policy);
// Set the threshold for the minimum and maximum time the client
// waits before requesting retransmission of a missing message.
// Base these values on the performance and load characteristics
// of the master and client host platforms as well as the round
// trip message time.
cur_env.rep_set_request(20000, 500000);
// Configure deadlock detection to ensure that any deadlocks
// are broken by having one of the conflicting lock requests
// rejected. DB_LOCK_DEFAULT uses the lock policy specified
// at environment creation time or DB_LOCK_RANDOM if none was
// specified.
cur_env.set_lk_detect(DB_LOCK_DEFAULT);
// The following base replication features may also be useful to your
// application. See Berkeley DB documentation for more details.
// - Master leases: Provide stricter consistency for data reads
// on a master site.
// - Timeouts: Customize the amount of time Berkeley DB waits
// for such things as an election to be concluded or a master
// lease to be granted.
// - Delayed client synchronization: Manage the master site's
// resources by spreading out resource-intensive client
// synchronizations.
// - Blocked client operations: Return immediately with an error
// instead of waiting indefinitely if a client operation is
// blocked by an ongoing client synchronization.
cur_env.repmgr_set_local_site(app_config->this_host.host,
app_config->this_host.port, 0);
for ( REP_HOST_INFO *cur = app_config->other_hosts; cur != NULL;
cur = cur->next) {
cur_env.repmgr_add_remote_site(cur->host, cur->port,
NULL, cur->peer ? DB_REPMGR_PEER : 0);
// Configure heartbeat timeouts so that repmgr monitors the
// health of the TCP connection. Master sites broadcast a heartbeat
// at the frequency specified by the DB_REP_HEARTBEAT_SEND timeout.
// Client sites wait for message activity the length of the
// DB_REP_HEARTBEAT_MONITOR timeout before concluding that the
// connection to the master is lost. The DB_REP_HEARTBEAT_MONITOR
// timeout should be longer than the DB_REP_HEARTBEAT_SEND timeout.
cur_env.rep_set_timeout(DB_REP_HEARTBEAT_SEND, 5000000);
cur_env.rep_set_timeout(DB_REP_HEARTBEAT_MONITOR, 10000000);
// The following repmgr features may also be useful to your
// application. See Berkeley DB documentation for more details.
// - Two-site strict majority rule - In a two-site replication
// group, require both sites to be available to elect a new
// master.
// - Timeouts - Customize the amount of time repmgr waits
// for such things as waiting for acknowledgements or attempting
// to reconnect to other sites.
// - Site list - return a list of sites currently known to repmgr.
// We can now open our environment, although we're not ready to
// begin replicating. However, we want to have a dbenv around
// so that we can send it into any of our message handlers.
cur_env.set_cachesize(0, CACHESIZE, 0);
cur_env.set_flags(DB_REP_PERMANENT, 1);
//cur_env.set_flags(DB_TXN_WRITE_NOSYNC, 1);
/* u_int32_t maxlocks=300000;
if (maxlocks != 0)
cur_env.set_lk_max_locks(maxlocks);
u_int32_t maxlocks_o=300000;
if (maxlocks_o != 0)
cur_env.set_lk_max_objects(maxlocks_o);
u_int32_t maxmutex=300000;
if (maxmutex != 0)
cur_env.mutex_set_max(maxmutex);
DbEnv *m_env=&cur_env;
m_env->set_flags(DB_TXN_NOSYNC, 1);
m_env->set_lk_max_lockers(60000);
m_env->set_lk_max_objects(60000);
m_env->set_lk_max_locks(60000);
m_env->set_tx_max(60000);
//m_env->repmgr_set_ack_policy(DB_REPMGR_ACKS_NONE);
m_env->rep_set_timeout(DB_REP_ACK_TIMEOUT, 50 * 1000); //50ms
m_env->rep_set_timeout(DB_REP_CHECKPOINT_DELAY, 0);
//m_env->rep_set_timeout(DB_REP_CONNECTION_RETRY, 30 * 1000 * 1000); // 30 seconds
m_env->rep_set_timeout(DB_REP_ELECTION_TIMEOUT, 1 * 1000 * 1000); // 5 seconds
m_env->rep_set_timeout(DB_REP_FULL_ELECTION_TIMEOUT, 5 * 1000 * 1000); // 5 seconds
m_env->rep_set_timeout(DB_REP_CONNECTION_RETRY, 5 * 1000 * 1000);
//m_env->rep_set_timeout(DB_REP_ELECTION_RETRY, 10 * 1000 * 1000); //10 seconds
//m_env->rep_set_timeout(DB_REP_HEARTBEAT_MONITOR, 80 * 1000 * 1000); //80 seconds
//m_env->rep_set_timeout(DB_REP_HEARTBEAT_SEND, 500 * 1000); //500 milli seconds
//The minimum number of microseconds a client waits before requesting retransmission
u_int32_t rep_req_min = 40000; //40 000 microsec = 40 mili
//The maximum number of microseconds a client waits before requesting retransmission
u_int32_t rep_req_max = 1280000;// 1 280 000 microsec = 1.28 sec
u_int32_t rep_limit_gbytes = 0;
u_int32_t rep_limit_bytes = 100 * 1024 * 1024; // 100MB
m_env->rep_set_request(rep_req_min, rep_req_max);
m_env->rep_set_limit(rep_limit_gbytes, rep_limit_bytes);
cur_env.open(app_config->home, DB_CREATE | DB_RECOVER |
DB_THREAD | DB_INIT_REP | DB_INIT_LOCK | DB_INIT_LOG |
DB_INIT_MPOOL | DB_INIT_TXN , 0);
//keep old function for chain
//old_rep_process_message=cur_env.get_DB_ENV()->rep_process_message;
//derouting
//cur_env.get_DB_ENV()->rep_process_message=my_rep_process_message;
/*int _i;
cur_env.log_get_config(DB_LOG_DIRECT, &_i);printf ("DB_LOG_DIRECT = %d\n",_i);
cur_env.log_get_config(DB_LOG_DSYNC, &_i);printf ("DB_LOG_DSYNC = %d\n",_i);
cur_env.log_get_config(DB_LOG_AUTO_REMOVE, &_i);printf ("DB_LOG_AUTO_REMOVE = %d\n",_i);
cur_env.log_get_config(DB_LOG_IN_MEMORY, &_i);printf ("DB_LOG_IN_MEMORY = %d\n",_i);
cur_env.log_get_config(DB_LOG_ZERO,&_i);printf ("DB_LOG_ZERO = %d\n",_i);
// Start checkpoint and log archive support threads.
(void)thread_create(&ckp_thr, NULL, checkpoint_thread, &cur_env);
(void)thread_create(&lga_thr, NULL, log_archive_thread, &cur_env);
(void)thread_create(&dmy_thr, NULL, dummy_write_thread, &cur_env);
cur_env.repmgr_start(3, app_config->start_policy);
}int RepQuoteExample::terminate() {
try {
// Wait for checkpoint and log archive threads to finish.
// Windows does not allow NULL pointer for exit code variable.
thread_exit_status_t exstat;
(void)thread_join(lga_thr, &exstat);
(void)thread_join(ckp_thr, &exstat);
(void)thread_join(dmy_thr, &exstat);
// We have used the DB_TXN_NOSYNC environment flag for
// improved performance without the usual sacrifice of
// transactional durability, as discussed in the
// "Transactional guarantees" page of the Reference
// Guide: if one replication site crashes, we can
// expect the data to exist at another site. However,
// in case we shut down all sites gracefully, we push
// out the end of the log here so that the most
// recent transactions don't mysteriously disappear.
cur_env.log_flush(NULL);
cur_env.close(0);
} catch (DbException dbe) {
cout << "error closing environment: " << dbe.what() << endl;
return 0;
void RepQuoteExample::prompt() {
cout << "QUOTESERVER";
if (!app_data.is_master)
cout << "(read-only)";
cout << "> " << flush;
void log(const char *msg) {
time_t currentTime;
// get and print the current time
time (¤tTime); // fill now with the current time
char buff[255];
strncpy(buff,ctime(¤tTime),sizeof(buff));
char *p;
for(p =buff ; *p != '\n'; p++);
*p = '\0';
cerr << buff << " - " << msg << endl;
// Simple command-line user interface:
// - enter "<stock symbol> <price>" to insert or update a record in the
// database;
// - just press Return (i.e., blank input line) to print out the contents of
// the database;
// - enter "quit" or "exit" to quit.
void RepQuoteExample::doloop() {
DbHolder dbh1(&cur_env,DATABASE);
DbHolder dbh2(&cur_env,DATABASE2);
DbHolder *dbh=&dbh1;
DbTxn *txn;
string input;
bool truncate = false;
char *c;
using_history();
g_repquote=*dbh;
int loop_rate = 0;
int txn_rate = 500;
while (prompt(), /*getline(cin, input)*/c=readline(NULL)) {
input=std::string(c);
add_history(c);
free(c);
int start_loop = 0;
int end_loop = 0;
int start_loop_d = 0;
int end_loop_d = 0;
istringstream is(input);
string token1, token2, token3;
truncate = false;
start_loop = 0;
end_loop = 0;
// Read 0, 1 or 2 tokens from the input.
int count = 0;
if (is >> token1) {
count++;
if (is >> token2)
count++;
if (is >> token3)
count++;
if (count == 1) {
if (token1 == "truncate" ) {
truncate = true;
else if (token1 == "env" ){
print_env(&cur_env);
continue;
else if (token1 == "verbose" ) {
app_config->verbose = !app_config->verbose;
if (app_config->verbose)
cur_env.set_verbose(DB_VERB_REPLICATION, 1);
cur_env.set_verbose(DB_VERB_REPMGR_MISC, 1);
cur_env.set_verbose(DB_VERB_RECOVERY, 1);
cur_env.set_verbose(DB_VERB_REP_ELECT, 1);
cur_env.set_verbose(DB_VERB_REP_LEASE, 1);
cur_env.set_verbose(DB_VERB_REP_SYNC, 1);
cur_env.set_verbose(DB_VERB_REPMGR_MISC, 1);
log("verbose is on");
else
cur_env.set_verbose(DB_VERB_REPLICATION, 0);
cur_env.set_verbose(DB_VERB_REPMGR_MISC, 0);
cur_env.set_verbose(DB_VERB_RECOVERY, 0);
cur_env.set_verbose(DB_VERB_REP_ELECT, 0);
cur_env.set_verbose(DB_VERB_REP_LEASE, 0);
cur_env.set_verbose(DB_VERB_REP_SYNC, 0);
cur_env.set_verbose(DB_VERB_REPMGR_MISC, 0);
log("verbose is off");
continue;
else if (token1 == "print" ) {
print_stocks(*dbh);
count = 0;
else if (token1 == "db1" ) {
dbh=&dbh1;
g_repquote=*dbh;
log( "switch to Db1");
count = 0;
else if (token1 == "db2" ) {
dbh=&dbh2;
g_repquote=*dbh;
log( "switch to Db2");
count = 0;
else if (token1 == "exit" || token1 == "quit") {
app_data.app_finished = 1;
break;
} else {
log("Format: <stock> <price>");
continue;
else if (count == 2)
if (token1 == "loop_rate" ){
loop_rate = atoi(token2.c_str());
continue;
if (token1 == "txn_rate" ){
txn_rate = atoi(token2.c_str());
continue;
else if (count == 3)
if (token1 == "loop" ) {
start_loop = atoi(token2.c_str());
end_loop = start_loop + atoi(token3.c_str());
if (token1 == "delete" ) {
start_loop_d = atoi(token2.c_str());
end_loop_d = start_loop_d + atoi(token3.c_str());
// Here we know count is either 0 or 2, so we're about to try a
// DB operation.
// Open database with DB_CREATE only if this is a master
// database. A client database uses polling to attempt
// to open the database without DB_CREATE until it is
// successful.
// This DB_CREATE polling logic can be simplified under
// some circumstances. For example, if the application can
// be sure a database is already there, it would never need
// to open it with DB_CREATE.
if (!dbh->ensure_open(app_data.is_master))
continue;
try {
if (count == 0)
if (app_data.in_client_sync)
log( "Cannot read data during client initialization - please try again.");
else
print_stocks_size(*dbh);
else if (!app_data.is_master)
log("Can't update at client");
else {
if (truncate)
u_int32_t no_remove;
txn = NULL;
cur_env.txn_begin(NULL, &txn, DB_TXN_NOWAIT);
try
(*dbh)->truncate(txn, &no_remove, 0);
// commit
txn->commit(0);
txn = NULL;
} catch (DbException &e) {
std::cout << "Error on txn commit: " << e.what() << std::endl;
// } catch (DbDeadlockException &) {
if (txn != NULL)
(void)txn->abort();
// std::cout << "Error on txn commit: " << std::endl;
else if (start_loop)
int j=0;
for (int i=start_loop; i<=end_loop; i=i+txn_rate)
//transaction begin
txn = NULL;
cur_env.txn_begin(NULL, &txn, 0);
for (j=i; j<=end_loop && j<=(i+txn_rate); j++)
Dbt key, value;
std::string key1, value1;
std::stringstream sstrm;
sstrm << "key" << j << ends;
key1 = sstrm.str();
key.set_data((void *)key1.c_str());
key.set_size((u_int32_t)strlen(key1.c_str()));
sstrm.str("");
int payload = rand() + j;
sstrm << "price" << payload << ends;
value1 = sstrm.str();
value.set_data((void *)value1.c_str());
value.set_size((u_int32_t)strlen(value1.c_str()));
// Perform the database put
(*dbh)->put(txn, &key, &value, 0);
printf("Kill me !!\n");
kill(getpid(),-9);
exit(0);
try
// commit
txn->commit(0);
txn = NULL;
} catch (DbException &e) {
std::cout << "Error on txn commit: " << e.what() << std::endl;
if (loop_rate>0)
usleep(txn_rate * 1000 * 1000 / loop_rate);
else if (start_loop_d)
int j=0;
for (int i=start_loop_d; i<=end_loop_d; i=i+100)
//transaction begin
txn = NULL;
cur_env.txn_begin(NULL, &txn, 0);
for (j=i; j<=end_loop_d && j<=(i+100); j++)
Dbt key, value;
std::string key1, value1;
std::stringstream sstrm;
sstrm << "key" << j << ends;
key1 = sstrm.str();
key.set_data((void *)key1.c_str());
key.set_size((u_int32_t)strlen(key1.c_str()));
// Perform the database put
(*dbh)->del(txn, &key, 0);
try
// commit
txn->commit(0);
txn = NULL;
} catch (DbException &e) {
std::cout << "Error on txn commit: " << e.what() << std::endl;
else
const char *symbol = token1.c_str();
StringDbt key(const_cast<char*>(symbol));
const char *price = token2.c_str();
StringDbt data(const_cast<char*>(price));
(*dbh)->put(NULL, &key, &data, 0);
} catch (DbDeadlockException e) {
log("please retry the operation");
dbh->close();
} catch (DbRepHandleDeadException e) {
log("please retry the operation");
dbh->close();
} catch (DbException e) {
if (e.get_errno() == DB_REP_LOCKOUT) {
log("please retry the operation");
dbh->close();
} else
throw;
dbh->close();
void RepQuoteExample::event_callback(DbEnv* dbenv, u_int32_t which, void *info)
static char buf[256];
APP_DATA app = (APP_DATA)dbenv->get_app_private();
info = NULL; /* Currently unused. */
switch (which) {
case DB_EVENT_REP_CLIENT:
app->is_master = 0;
app->in_client_sync = 1;
sprintf(buf,"%s - %s",progname,"CLIENT");
//EZ->dbenv->set_errpfx(buf);
log("DB_EVENT_REP_CLIENT.");
break;
case DB_EVENT_REP_MASTER:
app->is_master = 1;
app->in_client_sync = 0;
sprintf(buf,"%s - %s",progname,"MASTER");
//EZ->dbenv->set_errpfx(buf);
log("DB_EVENT_REP_MASTER.");
break;
case DB_EVENT_REP_NEWMASTER:
log("DB_EVENT_REP_NEWMASTER.");
app->in_client_sync = 1;
break;
case DB_EVENT_REP_PERM_FAILED:
// Did not get enough acks to guarantee transaction
// durability based on the configured ack policy. This
// transaction will be flushed to the master site's
// local disk storage for durability.
log("DB_EVENT_REP_PERM_FAILED.");
log("Insufficient acknowledgements to guarantee transaction durability.");
break;
case DB_EVENT_REP_STARTUPDONE:
app->in_client_sync = 0;
log("DB_EVENT_REP_STARTUPDONE.");
break;
case DB_EVENT_REP_ELECTION_FAILED:
log("DB_EVENT_REP_ELECTION_FAILED.");
//g_runner->init(g_config);
printf("Kill me !!\n");
kill(getpid(),-9);
exit(0);
break;
case DB_EVENT_REP_DUPMASTER:
log("DB_EVENT_REP_DUPMASTER.");
break;
default:
dbenv->errx("ignoring event %d", which);
void RepQuoteExample::print_stocks_size(Db *dbp) {
DB_BTREE_STAT *statp;
dbp->stat(NULL, &statp, 0);
log("db_stat");
cout << "***************************************** >>>>>>>>>>> : database contains " << (u_long)statp->bt_ndata << " records\n";
void RepQuoteExample::print_env(DbEnv *dbenv) {
dbenv->stat_print(DB_STAT_ALL);
void RepQuoteExample::print_stocks(Db *dbp) {
StringDbt key, data;
#define MAXKEYSIZE 10
#define MAXDATASIZE 20
char keybuf[MAXKEYSIZE + 1], databuf[MAXDATASIZE + 1];
char kbuf, dbuf;
memset(&key, 0, sizeof(key));
memset(&data, 0, sizeof(data));
kbuf = keybuf;
dbuf = databuf;
DbcAuto dbc(dbp, 0, 0);
cout << "\tSymbol\tPrice" << endl
<< "\t======\t=====" << endl;
int no_records =0;
for (int ret = dbc->get(&key, &data, DB_FIRST);
ret == 0;
ret = dbc->get(&key, &data, DB_NEXT)) {
key.get_string(&kbuf, MAXKEYSIZE);
data.get_string(&dbuf, MAXDATASIZE);
no_records++;
cout << "\t" << keybuf << "\t" << databuf << endl;
cout << "********************** NO Records " << no_records << endl;
cout << endl << flush;
dbc.close();
static void usage() {
cerr << "usage: " << progname << " -h home -l host:port [-CM]"
<< "[-r host:port][-R host:port]" << endl
<< " [-a all|quorum][-b][-n nsites][-p priority][-v]" << endl;
cerr << "\t -h home (required; h stands for home directory)" << endl
<< "\t -l host:port (required; l stands for local)" << endl
<< "\t -C or -M (optional; start up as client or master)" << endl
<< "\t -r host:port (optional; r stands for remote; any "
<< "number of these" << endl
<< "\t may be specified)" << endl
<< "\t -R host:port (optional; R stands for remote peer; only "
<< "one of" << endl
<< "\t these may be specified)" << endl
<< "\t -a all|quorum (optional; a stands for ack policy)" << endl
<< "\t -b (optional; b stands for bulk)" << endl
<< "\t -n nsites (optional; number of sites in replication "
<< "group; defaults " << endl
<< "\t to 0 to try to dynamically compute nsites)" << endl
<< "\t -p priority (optional; defaults to 100)" << endl
<< "\t -v (optional; v stands for verbose)" << endl;
exit(EXIT_FAILURE);
int main(int argc, char **argv) {
RepConfigInfo config;
char ch, portstr, tmphost;
int tmpport;
bool tmppeer;
config.no_dummy_wr = false;
// Extract the command line parameters
while ((ch = getopt(argc, argv, "E:a:bCh:l:Mn:p:R:r:vw")) != EOF) {
tmppeer = false;
switch (ch) {
case 'a':
if (strncmp(optarg, "all", 3) == 0)
config.ack_policy = DB_REPMGR_ACKS_ALL;
else if (strncmp(optarg, "quorum", 6) != 0)
usage();
break;
case 'b':
config.bulk = true;
break;
case 'C':
config.start_policy = DB_REP_CLIENT;
break;
case 'E':
config.start_policy = DB_REP_ELECTION;
break;
case 'h':
config.home = optarg;
break;
case 'l':
config.this_host.host = strtok(optarg, ":");
if ((portstr = strtok(NULL, ":")) == NULL) {
cerr << "Bad host specification." << endl;
usage();
config.this_host.port = (unsigned short)atoi(portstr);
config.got_listen_address = true;
break;
case 'M':
config.start_policy = DB_REP_MASTER;
break;
case 'n':
config.totalsites = atoi(optarg);
break;
case 'p':
config.priority = atoi(optarg);
break;
case 'R':
tmppeer = true; // FALLTHROUGH
case 'r':
tmphost = strtok(optarg, ":");
if ((portstr = strtok(NULL, ":")) == NULL) {
cerr << "Bad host specification." << endl;
usage();
tmpport = (unsigned short)atoi(portstr);
config.addOtherHost(tmphost, tmpport, tmppeer);
break;
case 'v':
config.verbose = true;
break;
case 'w':
config.no_dummy_wr = true;
//config.priority = 2;
break;
case '?':
default:
usage();
// Error check command line.
if ((!config.got_listen_address) || config.home == NULL)
usage();
RepQuoteExample runner;
g_runner=&runner;
g_config=&config;
try {
runner.init(&config);
runner.doloop();
} catch (DbException dbe) {
cerr << "Caught an exception during initialization or"
<< " processing: " << dbe.what() << endl;
runner.terminate();
return 0;
// This is a very simple thread that performs checkpoints at a fixed
// time interval. For a master site, the time interval is one minute
// plus the duration of the checkpoint_delay timeout (30 seconds by
// default.) For a client site, the time interval is one minute.
void checkpoint_thread(void args)
DbEnv *env;
APP_DATA *app;
int i, ret;
env = (DbEnv *)args;
app = (APP_DATA *)env->get_app_private();
for (;;) {
// Wait for one minute, polling once per second to see if
// application has finished. When application has finished,
// terminate this thread.
for (i = 0; i < 60; i++) {
sleep(1);
if (app->app_finished == 1)
return ((void *)EXIT_SUCCESS);
// Perform a checkpoint.
// original line
if ((ret = env->txn_checkpoint(0, 0, 0)) != 0) {
//if ((ret = env->txn_checkpoint(0, 0, DB_FORCE)) != 0) {
env->err(ret, "Could not perform checkpoint.\n");
return ((void *)EXIT_FAILURE);
// This is a simple log archive thread. Once per minute, it removes all but
// the most recent 3 logs that are safe to remove according to a call to
// DBENV->log_archive().
// Log cleanup is needed to conserve disk space, but aggressive log cleanup
// can cause more frequent client initializations if a client lags too far
// behind the current master. This can happen in the event of a slow client,
// a network partition, or a new master that has not kept as many logs as the
// previous master.
// The approach in this routine balances the need to mitigate against a
// lagging client by keeping a few more of the most recent unneeded logs
// with the need to conserve disk space by regularly cleaning up log files.
// Use of automatic log removal (DBENV->log_set_config() DB_LOG_AUTO_REMOVE
// flag) is not recommended for replication due to the risk of frequent
// client initializations.
void log_archive_thread(void args)
DbEnv *env;
APP_DATA *app;
char **begin, **list;
int i, listlen, logs_to_keep, minlog, ret;
env = (DbEnv *)args;
app = (APP_DATA *)env->get_app_private();
logs_to_keep = 3;
for (;;) {
// Wait for one minute, polling once per second to see if
// application has finished. When application has finished,
// terminate this thread.
for (i = 0; i < 60; i++) {
sleep(1);
if (app->app_finished == 1)
return ((void *)EXIT_SUCCESS);
// Get the list of unneeded log files.
if ((ret = env->log_archive(&list, DB_ARCH_ABS)) != 0) {
env->err(ret, "Could not get log archive list.");
return ((void *)EXIT_FAILURE);
if (list != NULL) {
listlen = 0;
// Get the number of logs in the list.
for (begin = list; *begin != NULL; begin++, listlen++);
// Remove all but the logs_to_keep most recent
// unneeded log files.
minlog = listlen - logs_to_keep;
for (begin = list, i= 0; i < minlog; list++, i++) {
if ((ret = unlink(*list)) != 0) {
env->err(ret,
"logclean: remove %s", *list);
env->errx(
"logclean: Error remove %s", *list);
free(begin);
return ((void *)EXIT_FAILURE);
free(begin);
#define DATABASE_DUMMY "dummy.db"
void create_dummy_db(DB_ENV env, DB *dbp)
DB_ENV *dbenv=env;
int ret;
u_int32_t db_flags;
if ((ret = db_create(dbp, dbenv, 0)) != 0)
dbenv->err(dbenv, ret, "create_dummy_db: db_create");
db_flags = DB_AUTO_COMMIT | DB_CREATE;
//if ((ret = (*dbp)->open(*dbp,NULL, DATABASE, NULL, DB_BTREE, db_flags, 0)) != 0)
if ((ret = (*dbp)->open(*dbp,NULL, NULL, DATABASE_DUMMY, DB_BTREE, db_flags, 0)) != 0)
dbenv->err(dbenv, ret, "create_dummy_db: DB->open");
void reopen_dummy_db(DB_ENV env, DB *dbp)
DB_ENV *dbenv=env;
int ret;
u_int32_t db_flags;
if ((ret = db_create(dbp, dbenv, 0)) != 0)
dbenv->err(dbenv, ret, "create_dummy_db: db_create");
db_flags = DB_AUTO_COMMIT | DB_CREATE;
//if ((ret = (*dbp)->open(*dbp,NULL, DATABASE, NULL, DB_BTREE, db_flags, 0)) != 0)
if ((ret = (*dbp)->open(*dbp,NULL, NULL, DATABASE_DUMMY, DB_BTREE, db_flags, 0)) != 0)
dbenv->err(dbenv, ret, "reopen_dummy_db: DB->open");
void perform_db_operation(DB_ENV env, DB *dbp, bool bRead)
//main loop
//DB *dbp=NULL;
DB_ENV *dbenv=env;
int ret;
u_int32_t db_flags;
DBT key, data;
char buf[20]="dummy", *rbuf;
rbuf=buf;
if (*dbp == NULL)
create_dummy_db(dbenv, dbp);
if (! bRead)
memset(&key, 0, sizeof(key));
memset(&data, 0, sizeof(data));
key.data = buf;
key.size = (u_int32_t)strlen(buf);
data.data = rbuf;
data.size = (u_int32_t)strlen(rbuf);
if ((ret = (*dbp)->put(*dbp, NULL, &key, &data, 0)) != 0)
if (ret == DB_REP_HANDLE_DEAD)
//create_dummy_db(dbenv, dbp);
reopen_dummy_db(dbenv, dbp);
(*dbp)->err(*dbp, ret, "DB->put :");
else
if (ret != DB_KEYEXIST)
(*dbp)->err(*dbp, ret, "perform_db_operation: DB->put");
else
DB_BTREE_STAT *statp;
(*dbp)->stat(*dbp,NULL, &statp, 0);
std::cout<<"dbp read stats: key#"<< statp->bt_nkeys <<std::endl;
void dummy_write_thread(void args)
DbEnv *env;
APP_DATA *app;
char **begin, **list;
int i, listlen, logs_to_keep, minlog, ret;
DB *m_dbp; // a pointer
env = (DbEnv *)args;
app = (APP_DATA *)env->get_app_private();
logs_to_keep = 3;
for (;;) {
if (! app->no_dummy_wr)
if (app->is_master)
perform_db_operation(env->get_DB_ENV(),&m_dbp,false);
//env->txn_checkpoint(0, 0, DB_FORCE);
usleep(1 * 1000 * 1000);
else
if (app->is_master)
//DB *db_quote=g_repquote->get_DB();
//perform_db_operation(env->get_DB_ENV(),&db_quote,true);
//if (g_repquote)
// g_runner->print_stocks_size(g_repquote);
//env->txn_checkpoint(0, 0, DB_FORCE);
//perform_db_operation(env->get_DB_ENV(),&m_dbp,false);
env->rep_flush();
usleep(4 * 1000 * 1000);
my script to simulate the split brain
#!/bin/sh
[ -z "$node1" ] && node1=10.10.32.121
[ -z "$node2" ] && node2=10.10.32.91
trap myend 0 1 2 3 6 9 14 15
myend()
echo "Receive signal to stop test..."
un_split_brain
echo "done"
exit 1
split_brain()
echo -n "Split-Brain at node $node..."
snmpset -m ALL -v 2c -c svil 10.10.0.100 ifAdminStatus.41 i 2 >/dev/null 2>&1
echo "done"
un_split_brain()
echo -n "Undo Split-Brain at node $node..."
snmpset -m ALL -v 2c -c svil 10.10.0.100 ifAdminStatus.41 i 1 >/dev/null 2>&1
echo "done"
is_slave()
local r=$(ssh root@$1 "tail -2 /tmp/BDB.log" | grep -c CLIENT)
[ $r -gt 1 ] && ret=1 || ret=0
return $ret
is_master()
local r=$(ssh root@$1 "tail -2 /tmp/BDB.log" | grep -c MASTER)
[ $r -gt 1 ] && ret=1 || ret=0
return $ret
wait_for_master()
echo -n "Waiting for MASTER at node $node ... "
is_master $node
r=$?
while ( [ ! $r -eq 1 ] )
do
usleep 500000
is_master $node
r=$?
echo -n "."
done
echo "done"
wait_for_slave()
local r
local tm
tm=0
echo -n "Waiting for SLAVE at node $node ... "
is_slave $node
r=$?
while ( [ ! $r -eq 1 ] )
do
usleep 500000
is_slave $node
r=$?
echo -n "."
tm=$((tm+1))
[ $tm -gt 120 ] && break
done
[ $tm -gt 120 ] && ret=0 || ret=1
echo "done"
return $ret
run_test_split_brain()
local nt
nt=1
nfails=0
x=4
[ -z "$1" ] && node=$node2
while ((1))
do
printf "*************** TEST [%02d] ********************\n" $nt
split_brain
wait_for_master
x=$((RANDOM%9))
echo -n " waiting $x sec ..."
sleep $x
echo "done"
un_split_brain
wait_for_slave
r=$?
[ ! $r -eq 1 ] && echo "`date` - test [$nt] - fails ..." || echo "`date` - test [$nt] - OK ."
[ ! $r -eq 1 ] && nfails=$((nfails+1))
perc_failure=$(echo "100.0 - $nfails / $nt * 100.0" | bc -l)
echo "************************************************ [% Success test $perc_failure % ]"
nt=$((nt+1))
x=$((RANDOM%9))
echo -n " waiting $x sec ..."
sleep $x
done
run_test_split_brain
here is the makefile to run to two environments
i run:
- make run
and in another window sh test_split_brain.sh
node1?=10.10.32.121
node2?=10.10.32.91
nsite?=2
debug?=0
all: RepQuoteExampleEric install
RepConfigInfo.o: RepConfigInfo.cpp RepConfigInfo.h
g++ -I/usr/local/BerkeleyDB.5.1/include/ -g -O0 -c RepConfigInfo.cpp -o RepConfigInfo.o
RepQuoteExampleEric: RepQuoteExampleEric.cpp RepConfigInfo.o
g++ -I/usr/local/BerkeleyDB.5.1/include/ -g -O0 RepQuoteExampleEric.cpp RepConfigInfo.o -o RepQuoteExampleEric -L /usr/local/BerkeleyDB.5.1/lib/ -lreadline -lcurses -ldb_cxx
kill:
-ssh -X root@$(node1) "killall -9 /root/RepQuoteExampleEric"
-ssh -X root@$(node2) "killall -9 /root/RepQuoteExampleEric"
run: RepQuoteExampleEric kill install clean_env
ssh -X root@$(node1) "xterm -geom 100x20+100+100 -e \"LD_LIBRARY_PATH=/usr/local/BerkeleyDB.5.1/lib/ /root/RepQuoteExampleEric -h /opt/bdb/ -l 2.0.0.110:12345 -r 2.0.0.210:12345 -a quorum -b -n $(nsite) -v | tee /tmp/BDB.log\"" &
ssh -X root@$(node2) "xterm -geom 100x20+800+100 -e \"LD_LIBRARY_PATH=/usr/local/BerkeleyDB.5.1/lib/ /root/RepQuoteExampleEric -h /opt/bdb/ -l 2.0.0.210:12345 -r 2.0.0.110:12345 -a quorum -b -n $(nsite) -v -w | tee /tmp/BDB.log\"" &
run_node2: clean_env2
ssh -X root@$(node2) "xterm -geom 100x20+800+100 -e \"LD_LIBRARY_PATH=/usr/local/BerkeleyDB.5.1/lib/ /root/RepQuoteExampleEric -h /opt/bdb/ -l 2.0.0.210:12345 -r 2.0.0.110:12345 -a quorum -b -n $(nsite) -v -w | tee /tmp/BDB.log\"" &
debug_node2: clean_env2
ssh -X root@$(node2) "xterm -geom 100x20+800+100 -e \"LD_LIBRARY_PATH=/usr/local/BerkeleyDB.5.1/lib/ /root/RepQuoteExampleEric -h /opt/bdb/ -l 2.0.0.210:12345 -r 2.0.0.110:12345 -a quorum -b -n $(nsite) -v -w | tee /tmp/BDB.log\"" &
sleep 3
ssh -X root@$(node2) /sbin/pidof RepQuoteExampleEric >/tmp/pid
ssh -X root@$(node2) ~/kdbg /root/db-5.1.19/examples/cxx/excxx_repquote/RepQuoteExampleEric -p `cat /tmp/pid`
run_debug_node1: RepQuoteExampleEric kill install clean_env
ssh -X root@$(node1) "xterm -geom 100x20+100+100 -e \"LD_LIBRARY_PATH=/usr/local/BerkeleyDB.5.1/lib/ /root/kdbg /root/RepQuoteExampleEric\" " &
ssh -X root@$(node2) "xterm -geom 100x20+800+100 -e \"LD_LIBRARY_PATH=/usr/local/BerkeleyDB.5.1/lib/ /root/RepQuoteExampleEric -h /opt/bdb/ -l 2.0.0.210:12345 -r 2.0.0.110:12345 -a quorum -b -n $(nsite) -v\"" &
run_debug_node2: RepQuoteExampleEric kill install clean_env
ssh -X root@$(node1) "xterm -geom 100x20+100+100 -e \"LD_LIBRARY_PATH=/usr/local/BerkeleyDB.5.1/lib/ /root/RepQuoteExampleEric -h /opt/bdb/ -l 2.0.0.110:12345 -r 2.0.0.210:12345 -a quorum -b -n $(nsite) -v\" " &
ssh -X root@$(node2) "xterm -geom 100x20+800+100 -e \"LD_LIBRARY_PATH=/usr/local/BerkeleyDB.5.1/lib/ /root/kdbg /root/RepQuoteExampleEric\"" &
install: RepQuoteExampleEric
scp RepQuoteExampleEric root@$(node1):~
scp RepQuoteExampleEric root@$(node2):~
clean_env: clean_env1 clean_env2
clean_env1:
ssh -X root@$(node1) rm -rf /opt/bdb/*
clean_env2:
ssh -X root@$(node2) rm -rf /opt/bdb/* -
I want to create an ALV with two row fields name
Hi
I want to create an ALV with two row fields name. please suggest how to do it or send some sample code
thanksHi,
see this link
http://****************/Tutorials/ALV/ALVMainPage.htm
http://www.alvrobot.com.ar/tutorial.php
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/b09ac4d5-e3ad-2910-6a81-96d1b861928c
http://abapprogramming.blogspot.com/2007/11/alv-check-boxes-sample-code.html
REPORT zalv5 NO STANDARD PAGE HEADING.
Description----
TOPICS INTRODUCED:
1. Learn about the u2018Standardu2019 PF-Status that comes as default.
2. Exclude function codes from u2018Standardu2019 PF-Status and customize it.
TYPE-POOLS: slis.
DATA: BEGIN OF i_data OCCURS 0,
qmnum LIKE qmel-qmnum,
qmart LIKE qmel-qmart,
qmtxt LIKE qmel-qmtxt,
ws_row TYPE i,
ws_char(5) TYPE c,
chk,
END OF i_data.
DATA: report_id LIKE sy-repid.
DATA: ws_title TYPE lvc_title VALUE 'An ALV Report'.
DATA: i_layout TYPE slis_layout_alv.
DATA: i_fieldcat TYPE slis_t_fieldcat_alv.
DATA: i_events TYPE slis_t_event.
DATA: i_header TYPE slis_t_listheader.
DATA: i_extab TYPE slis_t_extab.
SELECT qmnum
qmart
qmtxt
INTO TABLE i_data
FROM qmel
WHERE qmnum <= '00030000010'. LOOP AT i_data. i_data-ws_row = sy-tabix. i_data-ws_char = 'AAAAA'. MODIFY i_data. ENDLOOP. report_id = sy-repid. PERFORM f1000_layout_init CHANGING i_layout. PERFORM f2000_fieldcat_init CHANGING i_fieldcat. PERFORM f3000_build_header CHANGING i_header. PERFORM f4000_events_init CHANGING i_events. CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY' EXPORTING * I_INTERFACE_CHECK = ' ' * I_BYPASSING_BUFFER = * I_BUFFER_ACTIVE = ' ' i_callback_program = report_id * I_CALLBACK_PF_STATUS_SET = ' ' * I_CALLBACK_USER_COMMAND = ' ' * I_CALLBACK_TOP_OF_PAGE = ' ' * I_CALLBACK_HTML_TOP_OF_PAGE = ' ' * I_CALLBACK_HTML_END_OF_LIST = ' ' * i_structure_name = ' ' * I_BACKGROUND_ID = ' ' i_grid_title = ws_title * I_GRID_SETTINGS = is_layout = i_layout it_fieldcat = i_fieldcat * IT_EXCLUDING = * IT_SPECIAL_GROUPS = * IT_SORT = * IT_FILTER = * IS_SEL_HIDE = * I_DEFAULT = 'X' i_save = 'A' * IS_VARIANT = it_events = i_events * IT_EVENT_EXIT = * IS_PRINT = * IS_REPREP_ID = * I_SCREEN_START_COLUMN = 0 * I_SCREEN_START_LINE = 0 * I_SCREEN_END_COLUMN = 0 * I_SCREEN_END_LINE = 0 * IT_ALV_GRAPHICS = * IT_ADD_FIELDCAT = * IT_HYPERLINK = * IMPORTING * E_EXIT_CAUSED_BY_CALLER = * ES_EXIT_CAUSED_BY_USER = TABLES t_outtab = i_data EXCEPTIONS program_error = 1 OTHERS = 2 . IF sy-subrc <> 0.
MESSAGE ID sy-msgid TYPE sy-msgty NUMBER sy-msgno
WITH sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
ENDIF.
*& Form F1000_Layout_Init
FORM f1000_layout_init USING i_layout TYPE slis_layout_alv.
CLEAR i_layout.
i_layout-colwidth_optimize = 'X'.
i_layout-edit = 'X'.
ENDFORM. " F1000_Layout_Init
*& Form f2000_fieldcat_init
FORM f2000_fieldcat_init CHANGING i_fieldcat TYPE slis_t_fieldcat_alv.
DATA: line_fieldcat TYPE slis_fieldcat_alv.
CLEAR line_fieldcat.
line_fieldcat-fieldname = 'QMNUM'. " The field name and the table
line_fieldcat-tabname = 'I_DATA'. " name are the two minimum req.
line_fieldcat-key = 'X'. " Specifies the column as a key (Blue)
line_fieldcat-seltext_m = 'Notification No.'. " Column Header
APPEND line_fieldcat TO i_fieldcat.
CLEAR line_fieldcat.
line_fieldcat-fieldname = 'QMART'.
line_fieldcat-ref_tabname = 'I_DATA'.
line_fieldcat-hotspot = 'X'. " Shows the field as a hotspot.
line_fieldcat-seltext_m = 'Notif Type'.
APPEND line_fieldcat TO i_fieldcat.
CLEAR line_fieldcat.
line_fieldcat-fieldname = 'QMTXT'.
line_fieldcat-tabname = 'I_DATA'.
line_fieldcat-seltext_m = 'Description'.
APPEND line_fieldcat TO i_fieldcat.
CLEAR line_fieldcat.
line_fieldcat-fieldname = 'WS_ROW'.
line_fieldcat-tabname = 'I_DATA'.
line_fieldcat-seltext_m = 'Row Number'.
APPEND line_fieldcat TO i_fieldcat.
CLEAR line_fieldcat.
line_fieldcat-fieldname = 'WS_CHAR'.
line_fieldcat-tabname = 'I_DATA'.
line_fieldcat-seltext_l = 'Test Character Field'.
line_fieldcat-datatype = 'CHAR'.
line_fieldcat-outputlen = '15'. " You can specify the width of a
APPEND line_fieldcat TO i_fieldcat. " column.
CLEAR line_fieldcat.
line_fieldcat-fieldname = 'CHK'.
line_fieldcat-tabname = 'I_DATA'.
line_fieldcat-seltext_l = 'Checkbox'.
line_fieldcat-checkbox = 'X'. " Display this field as a checkbox
line_fieldcat-edit = 'X'. " This option ensures that you can
" edit the checkbox. Else it will
" be protected.
APPEND line_fieldcat TO i_fieldcat.
ENDFORM. " f2000_fieldcat_init
*& Form f3000_build_header
FORM f3000_build_header USING i_header TYPE slis_t_listheader.
DATA: gs_line TYPE slis_listheader.
CLEAR gs_line.
gs_line-typ = 'H'.
gs_line-info = 'This is line of type HEADER'.
APPEND gs_line TO i_header.
CLEAR gs_line.
gs_line-typ = 'S'.
gs_line-key = 'STATUS 1'.
gs_line-info = 'This is line of type STATUS'.
APPEND gs_line TO i_header.
gs_line-key = 'STATUS 2'.
gs_line-info = 'This is also line of type STATUS'.
APPEND gs_line TO i_header.
CLEAR gs_line.
gs_line-typ = 'A'.
gs_line-info = 'This is line of type ACTION'.
APPEND gs_line TO i_header.
ENDFORM. " f3000_build_header
*& Form f4000_events_init
FORM f4000_events_init CHANGING i_events TYPE slis_t_event.
DATA: line_event TYPE slis_alv_event.
CLEAR line_event.
line_event-name = 'TOP_OF_PAGE'.
line_event-form = 'F4100_TOP_OF_PAGE'.
APPEND line_event TO i_events.
CLEAR line_event.
line_event-name = 'PF_STATUS_SET'.
line_event-form = 'F4200_PF_STATUS_SET'.
APPEND line_event TO i_events.
ENDFORM. " f3000_events_init
FORM F4100_TOP_OF_PAGE *
FORM f4100_top_of_page.
CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
EXPORTING
it_list_commentary = i_header.
ENDFORM.
FORM F4200_PF_STATUS_SET *
FORM f4200_pf_status_set USING i_extab TYPE slis_t_extab.
REFRESH i_extab.
PERFORM f4210_exclude_fcodes CHANGING i_extab.
SET PF-STATUS 'STANDARD' OF PROGRAM 'SAPLSALV' EXCLUDING i_extab.
ENDFORM.
*& Form f4210_exclude_fcodes
FORM f4210_exclude_fcodes USING i_extab TYPE slis_t_extab.
DATA: ws_fcode TYPE slis_extab.
CLEAR ws_fcode.
ws_fcode = '&EB9'. " Call up Report.
APPEND ws_fcode TO i_extab.
ws_fcode = '&ABC'. " ABC Analysis.
APPEND ws_fcode TO i_extab.
ws_fcode = '&NFO'. " Info Select.
APPEND ws_fcode TO i_extab.
ws_fcode = '&LFO'. " Information.
APPEND ws_fcode TO i_extab.
ENDFORM. " f4210_exclude_fcodes
thanks
karthik
reward me if usefull
Maybe you are looking for
-
Wifi suddenly not working with new networks?
This is already my second iPhone 5, since the last went into warranty because, ironically, of a wifi problem. The other day, I was just minding my own business when I decided to try to connect to the local wifi of the place I was at the time, and it
-
Struggling to understand photo resolution in iCloud
I am finding it difficult to understand how the photos in the cloud works with regard to full- and reduced-resolution photos. Optimise ipad storage is turned on so, in theory, only reduced versions are kept on the iPad. I imported some photos with th
-
EJB support in Oracle products
I'm curious. Since current Oracle products only support session beans and not entity beans, what can be done with just the session beans? I would love to be able to get the full utilization of EJB, but would have to acquire "a whole nother" server (l
-
Hi, i'm trying to do a google like search in a J2EE application using Oracle 8.1.7 with Intermedia Text. Thus, I want to query database and return a set with first the 'AND results' and then the 'OR result'. The result set must be distinct. I came up
-
I had an issue with a device being installed on my laptop, as recommended I ran something on the command prompt program, after that firefox has not started, I thought easy solution was uninstal/ re install, no luck, please help, I single, double, tri