Deal with Counter to no of times
Hi All,
My selection screen has vbeln & kunnr as parameter.
When user enters 1st doc as 91000000 etimes a filed in my table zmailhist would be set to 1.
when new doc set to 1 but when same doc set to 2.
How to achieve this...
Rudra, ABAP.
Dear ,
use this logic
TYPES : BEGIN OF W_TSP01.
INCLUDE STRUCTURE MARA .
TYPES: END OF W_TSP01 .
DATA : IT_TSP01 TYPE STANDARD TABLE OF MARA WITH HEADER LINE .
DATA : IT_TSP02 TYPE STANDARD TABLE OF MARA WITH HEADER LINE .
DATA : FIELD1(10) TYPE C .
DATA : FIELD2(10) TYPE C .
DATA : CNT TYPE I .
DATA : V_bismt TYPE MARA-BISMT .
SELECT * FROM MARA INTO CORRESPONDING FIELDS OF TABLE IT_TSP01 .
LOOP AT IT_TSP01.
IF V_bismt = IT_TSP01-BISMT .
CNT = CNT + 1 .
ELSE.
CNT = 1.
ENDIF.
V_MATNR = IT_TSP01-BISMT .
WRITE:/ IT_TSP01-BISMT .
WRITE: CNT .
ENDLOOP.
insted of bismt check your field i.e vbeln and see the output .
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Post Author: dmazourick
CA Forum: Data Connectivity and SQL
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=================================================
Sub DisplayReport(Server as String, DB as String, UID as String, PWD as String, viewer as Object)
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Set report = app.OpenReport("D:\TestReport_X.rpt")
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end sub
=================================================
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Weu2019re really looking for any help in this questionPost Author: fburch
CA Forum: Data Connectivity and SQL
I am having similar problems and some successes.
I have 70+ reports and now suddenly I want to point them at two different servers, but at databases with the same name like you talked about.
I first just tried the following:
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Dim CrTable As Table
Dim crtableLogoninfos As New TableLogOnInfos()
Dim crtableLogoninfo As New TableLogOnInfo()
With crConnectionInfo
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End If
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crtableLogoninfo = CrTable.LogOnInfo
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Dim crSections As Sections
Dim crSection As Section
Dim crReportObjects As ReportObjects
Dim crReportObject As ReportObject
Dim crSubreportObject As SubreportObject
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Dim subRepDoc As New ReportDocument()
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CrTable.ApplyLogOnInfo(crtableLogoninfo)
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Next
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Next
Next
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crv.ReportSource = myReport
crv.Refresh()
#5 Call export to disk function.
This was not changing server - did not realize it was a caching problem as you suggested. That makes sense. So anyway, then of course I threw a verify database statement on there, before I get the data. Now looks like this:
#1 Load Report
#2. Pass in parameter values (dummy values that will generate schema of table without having to actually run long running procedures, i.e. select (cast 1 as int) as somefield1, cast(2.0 as numeric(10,0)) as somefield2
#3 Set "Table Log in info"
#3b Verify the database which seems to be a necessity:
myReport.VerifyDatabase()
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#4 go get the data
#5 Call export to disk function.
This does work, some of the time. When the datasource underlying report are tables, it works. I made a dummy crystal report with lots of different types of params (stored procedure underlying database) - this also worked!
Unfortunately, when I run this against the majority of my reports, I get this stupid "invalid mapping type value", for which I have not been able to resolve yet.
I also tried putting a myreport.SetDatabaseLogon("","") -- what would this do, clear it out? (saw this referenced somewhere).
Then I tried putting the real connection info in there as well ...
myReport.SetDatabaseLogon(uid, pwd, serverName, DBname)
I put this setdatabase thing before I called verifydatabase, which is where the process is bombing out and giving me invalid mapping type for the reports that do not run.
At this point I am still working on solution. I have tried creating dummy report that used same parameter types as a report that was failing and voila - the dummy report worked. Anyway, let me know if you get your problem fixed and I will do the same. Looks like you are using a different method that I didn't notice "LogOnServer" -
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|
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Your best bet would be to create a custom object with the columns you're after, but that involves iterating through each owner and you won't get it on a single command.
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$outputArray += New-Object -TypeName PSObject -Property $output
$outputArray | Format-Table *
Obviously in my particular case the result will be almost unreadable as a table, since there's no more no less than 42 different properties on that object, but hey, this is what you asked for! You deal with it now :D
PS: I'm just in a good mood today. No idea why, but I am. Please don't follow my 'You deal with it now' to the letter. If you have problems or questions come back! -
What's best strategy for dealing with 40+ hours of footage
We have been editing a documentary with 45+ hours of footage and presently have captured roughly 230 gb. Needless to say it's a lot of files. What's the best strategy for dealing with so much captured footage? It's almost impossible to remember it all and labeling it while logging it seems inadequate as it difficult to actually read comments in dozens and dozens of folders.
Just looking for suggestions on how to deal with this problem for this and future projects.
G5 Dual Core 2.3 Mac OS X (10.4.6) 2.5 g ram, 2 internal sata 2 250gbDitto, ditto, ditto on all of the previous posts. I've done four long form documentaries.
First I listen to all the the sound bytes and digitize only the ones that I think I will need. I will take in much more than I use, but I like to transcribe bytes from the non-linear timeline. It's easier for me.
I had so many interviews in the last doc that I gave each interviewee a bin. You must decide how you want to organize the sound bytes. Do you want a bin for each interviewee or do you want to do it by subject. That will depend on you documentary and subject matter.
I then have b-roll bins. Sometime I base them on location and sometimes I base them on subject matter. This last time I based them on location because I would have a good idea of what was in each bin by remembering where and when it was shot.
Perhaps, you weren't at the shoot and do not have this advantage. It's crucial that you organize you b-roll bins in a way that makes sense to you.
I then have music bins and bins for my voice over.
Many folks recommend that you work in small sequences and nest. This is a good idea for long form stuff. That way you don't get lost in the timeline.
I also make a "used" bin. Once I've used a shot I pull it out of the bin and put it "away" That keeps me from repeatedly looking at footage that I've already used.
The previous posts are right. If you've digitized 45 hours of footage you've put in too much. It's time to start deleting some media. Remember that when you hit the edit suite, you should be one the downhill slide. You should have a script and a clear idea of where you're going.
I don't have enough fingers to count the number of times that I've had producers walk into my edit suite with a bunch of raw tape and tell me that that "want to make something cool." They generally have no idea where they're going and end up wondering why the process is so hard.
Refine your story and base your clip selections on that story.
Good luck
Dual 2 GHz Power Mac G5 Mac OS X (10.4.8) -
Dealing with large files, again
Ok, so I've looked into using BufferedReaders and can't get my head round them; or more specifically, I can't work out how to apply them to my code.
I have inserted a section of my code below, and want to change it so that I can read in large files (of over 5 million lines of text). I am reading the data into different arrays and then processing them. Obvioulsy, when reading in such large files, my arrays are filling up and failing.
Can anyone suggest how to read the file into a buffer, deal with a set amount of data, process it, empty the arrays, then read in the next lot?
Any ideas?
void readV2(){
String line;
int i=0,lineNo=0;
try {
//Create input stream
FileReader fr = new FileReader(inputFile);
BufferedReader buff = new BufferedReader(fr);
while((line = buff.readLine()) != null) {
if(line.substring(0,2).equals("V2")){
lineNo = lineNo+1;
IL[i] = Integer.parseInt(line.substring(8,15).trim());
//Other processing here
NoOfPairs = NoOfPairs+1;
}//end if
else{
break;
}//end while
buff.close();
fr.close();
}//end try
catch (IOException e) {
log.append("IOException error in readESSOV2XY" + e + newline);
proceed=false;
}//end catch IOException
catch (ArrayIndexOutOfBoundsException e) {
arrayIndexOutOfBoundsError(lineNo);
}//end catch ArrayIndexOutOfBoundsException
catch (StringIndexOutOfBoundsException e) {
stringIndexOutOfBoundsError(e.getMessage(),lineNo);
}//end V2Many thanks for any help!
TimYeah, ok, so that seems simple enough.
But once I have read part of the file into my program,
I need to call another method to deal with the data I
have read in and write it out to an output file.
How do I get my file reader to "remember" where I am
up to in the file I'm reading?
An obvious way, but possibly not too good technically,
would be to set a counter and when I go back to the
fiel reader, skip that number of lines in the inpuit
file.
This just doesn't seem too efficient, which is
critical when it comes to dealing with such large
files (i.e. several million lines long)I think you might need to change the way you are thinking about streams. The objective of a stream is to read and process data at the same time.
I would recommend that you re-think your algorithm : instead of reading the whole file, then doing your processing - think about how you could read a line and process a line, then read the next line, etc...
By working on just the pieces of data that you have just read, you can process huge files with almost no memory requirements.
As a rule of thumb, if you ever find yourself creating huge arrays to hold data from a file, chances are pretty good that there is a better way. Sometimes you need to buffer things, but very rarely do you need to buffer such huge pieces.
- K -
Hi
I'm preparing 4 1z0-051 exam and i want to master dealing with multi choice questions and lab question and all the detail about the exam technics not the books or references
thank youAmr Halima wrote:
thnk you for response I've read the resources you support me with, and still have some questions:
1) How can i review the unmarked questions if i discover that my answer is wrong ??
Its actually a while since i took an oracle cert exam, and the last one i took the 'skin' had changed so it was a little different to the classic style. But the basics are the same.
I dont have a exam in front of me as i write this.
There are buttons to go through to NEXT and PREVIOUS questions. If you are at the end of the exam and wish to go to the beginning the thats a lot of previous buttons. But you an goto the review page at the end and jump to the question you require.
You have the option of tagging any as marked for review. The idea is if you have time at the end you can focus your review the questions you have tagged
The final page (and there may well be a button to go this on every page, but dont quote me) while have the means to select
whether you wish to review all questions: all 'unmarked' questions, or 'all tagged for review' questions. The way this worked varied
on the last exam i took; the previous classic style use to show all questions with a checked and a colour to show if the question
had been answered and had been tagged for review. The last exam i took i think the final page worked with buttons used to filter
the questions it dsipayed to just to from between:
- All questions
- Questions not fully answered.
- Questions not tagged for review.
A question is not fully answered if the candidate has not given a sufficient number of answers to which satisfies the question criteria.
To demonstrate this:
- Let us consider the question:
Q.34 Choose the following cities where they are not the capital city of the associated country:
A: Dublin is the capital city of the Republic of Ireland
B: Beijing is the capital city of India
C: Moscow is the capital city of Russia
D: Washington is the capital of England
Select the best two answers:Notes:
(1) Now B and D are obviously the correct answers, and A and C incorrect.
(2) Be aware that maybe 3% of candidates as this point would have failed to read the question correctly and will mark A and C as correct, +(Quote(my old Chemistry teacher): if all else fails read the question)+.
(3) If the candidate only checked one answer, say 'C' then this question would appear on the list of unmarked questions for review and the candidate would not receive marks for the question.
(4) The the question had said select one or more correct answers and the candidate had checked C only, then the question would NOT appear on the list of unmarked questions. In general high exams such as OCP will contain more questions of the form select one or more possible answers.
You may find it is possible to grey incorrect answers by right clicking them. This can be useful to focus on the correct answers. You can actually do the same thing by writing it on the marker board you are given.
Let us say I come to the question above. Let us say I know for sure 'C' that Russia is the capital of Moscow is true so i eliminate that (Either right to grey it out or write Q34: C-X on my marker board. I know London is the Capital of England so therefore +D: Washington is the capital of england so i check 'D' as I know that is correct. But let us say i am not sure about A B, which is true and which is false.
- I mark this question for review as I am not sure about it and perhaps it is worth coming back to later +(If I have time)+. I might make a mark Q34 capitals on by marker board so i know which one to come back to. Even if i dont know the last answer i need to mark i will have wanted to have guessed it by the time i finished the exam. I would certainly want to have made a guess by the end of the exam, so if i am running short of time i would guess as I might not have time to return, if i am well up on time i might leave it unmarked for now.
- One danger of greying out incorrect answers is one may forget to check the correct answers. I remember finishing an exam and discovering on the review screen i had not answered a question. I had greyed out the wrong answers but forgotten to check the right answers! i would have gotten no marked, as it is checked answers that count. Please be aware greying out of answers are only a help to the candidate and may not be present on all exams
- Sometimes drag and drop answers may also be present. There may also be exhibits to view; and you should note how these may be tiled onto the screen. Beware of spending too much time looking at these.
2) for multi choice questions if i have a - choose all that apply- question and i've chose just one answer and it was right .Do I take a part of the mark of the question??
and if i chose all the right answers and one wrong .Do i loose all the mark of the question??In all cases if you fail to select all correct answers you will recieve no marks for the question
>
what's the grading policy?? i didn't find a topic about this
With Oracle Certification exams one either passes or fails. The pass percentage appears on your exam score report. It does not appear on your certification. The pass mark is chosen after reviewing the exam at the end of beta testing stage, and may be adjusted in production if a revision is demeed necessary.
>
thank you -
Dealing with hard timeout of guarded service
Hi, I'm investigating the behavior the cause of and subsequent behavior after a hard timeout of a guarded service. In my experience, the grid members are unable to recover properly. I am trying to figure out whether there is something in our configuration that may be aggravating the situation, and also see whether I might be able to improve the behavior of our client code.
What I have done is purposely lower the service guardian's timeout, to about 25 seconds, so that a certain EntryProcessor will always time-out. The behavior I see after the timeout is very similar to the behavior we see when the problem crops up in the real world. I know that I can raise the timeout or use the PriorityTask API, but even if I do that, we may run into timeouts due to deadlock. If that happens, I want to know what I can expect the grid to do.
Here's what I'm seeing:
I am running 2 storage-enabled members with backup-count=0. I am running my "client" as a non-storage-enabled member.
First, the client kicks off the EntryProcessor:
Map<Object, Integer> readProcessorResult = requestCache.invokeAll(AlwaysFilter.INSTANCE, processor);
The two members begin logging successful executions of the EntryProcessor. Then, one of the members happens to run it against an entry that takes longer than the service guardian's timeout. We get a soft and hard timeout:
[ERROR] Coherence: 2012-01-26 10:56:20.103/333.297Oracle Coherence GE 3.7.1.2 <Error> (thread=Cluster, member=1): Detected soft timeout) of {WrapperGuardable Guard{Daemon=DistributedCache:jdw-read-request-service} Service=PartitionedCache{Name=jdw-read-request-service, State=(SERVICE_STARTED), LocalStorage=enabled, PartitionCount=257, BackupCount=0, AssignedPartitions=128}}
[WARN ] Coherence: 2012-01-26 10:56:20.121/333.315Oracle Coherence GE 3.7.1.2 <Warning> (thread=Recovery Thread, member=1): Attempting recovery of Guard{Daemon=DistributedCache:jdw-read-request-service}
[ERROR] Coherence: 2012-01-26 10:56:22.604/335.798Oracle Coherence GE 3.7.1.2 <Error> (thread=Cluster, member=1): Detected hard timeout) of {WrapperGuardable Guard{Daemon=DistributedCache:jdw-read-request-service} Service=PartitionedCache{Name=jdw-read-request-service, State=(SERVICE_STARTED), LocalStorage=enabled, PartitionCount=257, BackupCount=0, AssignedPartitions=128}}Now, for some reason (why?), Coherence determines that the service is unrecoverable and it must stop the cluster:
[WARN ] Coherence: 2012-01-26 10:56:22.605/335.799Oracle Coherence GE 3.7.1.2 <Warning> (thread=Termination Thread, member=1): Terminating Guard{Daemon=DistributedCache:jdw-read-request-service}
Coherence <Error>: Halting this cluster node due to unrecoverable service failure
[ERROR] Coherence: 2012-01-26 10:56:23.613/336.807Oracle Coherence GE 3.7.1.2 <Error> (thread=Cluster, member=1): StopRunning ClusterService{Name=Cluster, State=(SERVICE_STARTED, STATE_JOINED), Id=0, Version=3.7.1, OldestMemberId=1} due to unhandled exception:
[ERROR] Coherence: 2012-01-26 10:56:23.613/336.807Oracle Coherence GE 3.7.1.2 <Error> (thread=PacketListener1P, member=1): Stopping cluster due to unhandled exception: com.tangosol.net.messaging.ConnectionException: UdpSocket.receive: unable to reopen socket; State=STATE_CLOSED
at com.tangosol.coherence.component.net.socket.UdpSocket.receive(UdpSocket.CDB:58)
at com.tangosol.coherence.component.net.UdpPacket.receive(UdpPacket.CDB:1)
at com.tangosol.coherence.component.util.daemon.queueProcessor.packetProcessor.PacketListener.onNotify(PacketListener.CDB:20)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
at java.lang.Thread.run(Unknown Source)
[ERROR] Coherence: 2012-01-26 10:56:23.641/336.835Oracle Coherence GE 3.7.1.2 <Error> (thread=Cluster, member=n/a):
java.lang.NullPointerException: null
at com.tangosol.coherence.component.net.Cluster$ClusterService$TcpRing.onAcceptException(Cluster.CDB:13) ~[coherence-3.7.1.2.jar:3.7.1.2]
at com.tangosol.coherence.component.net.TcpRing.onAccept(TcpRing.CDB:25) ~[coherence-3.7.1.2.jar:3.7.1.2]
at com.tangosol.coherence.component.net.TcpRing.onSelect(TcpRing.CDB:27) ~[coherence-3.7.1.2.jar:3.7.1.2]
at com.tangosol.coherence.component.net.TcpRing.select(TcpRing.CDB:14) ~[coherence-3.7.1.2.jar:3.7.1.2]
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ClusterService.onWait(ClusterService.CDB:6) ~[coherence-3.7.1.2.jar:3.7.1.2]
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:39) ~[coherence-3.7.1.2.jar:3.7.1.2]
at java.lang.Thread.run(Unknown Source) [na:1.6.0_30]
[WARN ] Coherence: 2012-01-26 10:56:24.976/338.170Oracle Coherence GE 3.7.1.2 <Warning> (thread=Invocation:jdw-invocation-service, member=n/a): failed to stop 95 worker threads; abandoning
Coherence <Error>: Halted the cluster:
Cluster is not running: State=5
Exception in thread "Cluster|SERVICE_STOPPED|Member(Id=1, Timestamp=2012-01-26 10:50:58.044, Address=192.168.1.67:9001, MachineId=52295, Location=site:,machine:DEN12956L,process:10012, Role=CoherenceServer)" java.nio.channels.ClosedSelector
Exception
at sun.nio.ch.SelectorImpl.keys(Unknown Source)
at com.tangosol.coherence.component.net.TcpRing.disconnectAll(TcpRing.CDB:6)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ClusterService$TcpRing.onLeft(ClusterService.CDB:4)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ClusterService.onStopRunning(ClusterService.CDB:7)
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ClusterService.onException(ClusterService.CDB:28)
at com.tangosol.coherence.component.net.Cluster$ClusterService.onException(Cluster.CDB:7)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:85)
[ERROR] Coherence: 2012-01-26 10:56:25.616/338.810 Oracle Coherence GE 3.7.1.2 <Error> (thread=Cluster, member=n/a): StopRunning ClusterService{Name=Cluster, State=(SERVICE_STOPPED, STATE_JOINED), Id=0, Version=3.7.1} due to unhandled exception:
at java.lang.Thread.run(Unknown Source)
[ERROR] Coherence: 2012-01-26 10:56:25.616/338.810Oracle Coherence GE 3.7.1.2 <Error> (thread=Cluster, member=n/a):
java.nio.channels.ClosedSelectorException: null
at sun.nio.ch.SelectorImpl.keys(Unknown Source) ~[na:1.6.0_30]
at com.tangosol.coherence.component.net.TcpRing.close(TcpRing.CDB:11) ~[coherence-3.7.1.2.jar:3.7.1.2]
at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.ClusterService.onExit(ClusterService.CDB:1) ~[coherence-3.7.1.2.jar:3.7.1.2]
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:68) ~[coherence-3.7.1.2.jar:3.7.1.2]
at java.lang.Thread.run(Unknown Source) [na:1.6.0_30]Around the same time that member 1 decided to stop its cluster, member 2, which had been happily executing entry processors, begins taking responsibility for member 1's partitions. That's what I'd expect.
[WARN ] Coherence: 2012-01-26 10:56:23.643/336.784Oracle Coherence GE 3.7.1.2 <Warning> (thread=DistributedCache:sys-id-dist-service, member=2): Assigned 128 orphaned primary partitions
[WARN ] Coherence: 2012-01-26 10:56:23.646/336.787Oracle Coherence GE 3.7.1.2 <Warning> thread=DistributedCache:sourceMetadataReviewCache-service, member=2): Assigned 128 orphaned primary partitions
......Member 1 now restarts its cluster and re-joins as member 4, and starts re-starting its services:
[INFO ] Coherence: 2012-01-26 10:56:26.008/339.202Oracle Coherence GE 3.7.1.2 <Info> (thread=main, member=n/a): Restarting cluster
[INFO ] Coherence: 2012-01-26 10:56:26.327/339.521Oracle Coherence GE 3.7.1.2 <Info> (thread=Cluster, member=n/a): This Member(Id=4, Timestamp=2012-01-26 10:56:26.126, Address=192.168.1.67:9001, MachineId=52295, Location=site:,machine:DEN12956L,process:10012, Role=CoherenceServer, Edition=Grid Edition, Mode=Development, CpuCount=2, SocketCount=2) joined cluster "NIR_GRID_DEV" with senior Member(Id=2, Timestamp=2012-01-26 10:51:03.593, Address=192.168.1.67:9003, MachineId=52295, Location=site:,machine:DEN12956L,process:10024, Role=CoherenceServer, Edition=Grid Edition, Mode=Development, CpuCount=2, SocketCount=2)
[INFO ] Coherence: 2012-01-26 10:56:26.364/339.558Oracle Coherence GE 3.7.1.2 <Info> (thread=main, member=n/a): Started cluster Name=NIR_GRID_DEV
Group{Address=224.3.7.0, Port=60000, TTL=0}
MasterMemberSet(
ThisMember=Member(Id=4, Timestamp=2012-01-26 10:56:26.126, Address=192.168.1.67:9001, MachineId=52295, Location=site:,machine:DEN12956L,process:10012, Role=CoherenceServer)
OldestMember=Member(Id=2, Timestamp=2012-01-26 10:51:03.593, Address=192.168.1.67:9003, MachineId=52295, Location=site:,machine:DEN12956L,process:10024, Role=CoherenceServer)
ActualMemberSet=MemberSet(Size=3
Member(Id=2, Timestamp=2012-01-26 10:51:03.593, Address=192.168.1.67:9003, MachineId=52295, Location=site:,machine:DEN12956L,process:10024, Role=CoherenceServer)
Member(Id=3, Timestamp=2012-01-26 10:55:05.522, Address=192.168.1.67:9005, MachineId=52295, Location=site:,machine:DEN12956L,process:13268, Role=IntellijRtExecutionAppMain)
Member(Id=4, Timestamp=2012-01-26 10:56:26.126, Address=192.168.1.67:9001, MachineId=52295, Location=site:,machine:DEN12956L,process:10012, Role=CoherenceServer)
MemberId|ServiceVersion|ServiceJoined|MemberState
2|3.7.1|2012-01-26 10:51:03.593|JOINED,
3|3.7.1|2012-01-26 10:55:05.522|JOINED,
4|3.7.1|2012-01-26 10:56:26.337|JOINED
RecycleMillis=1200000
RecycleSet=MemberSet(Size=0
TcpRing{Connections=[2, 3]}
IpMonitor{AddressListSize=0}
[INFO ] Coherence: 2012-01-26 10:56:26.365/339.559Oracle Coherence GE 3.7.1.2 <Info> (thread=main, member=4): Restarting Service:Management
[INFO ] Coherence: 2012-01-26 10:56:26.417/339.611Oracle Coherence GE 3.7.1.2 <Info> (thread=main, member=4): Restarting Service:jdwSourceManagerCache-service
......While that is happening, member 2 now also encounters a hard timeout on the same service and begins going through the same process that member 1 just went through. I am not sure why member 2 encounters this timeout. Perhaps it is because it ran another entry processor that took too long? It is difficult to tell. Except this time we start having problems when member 2 tries to stop the cluster, and I'm not sure exactly why. Perhaps because member 4 is not yet in a good state?
[ERROR] Coherence: 2012-01-26 10:56:35.282/348.423Oracle Coherence GE 3.7.1.2 <Error> (thread=PacketListener1, member=2): Stopping cluster due to unhandled exception:
com.tangosol.net.messaging.ConnectionException: UdpSocket.receive: unable to reopen socket; State=STATE_CLOSED
at com.tangosol.coherence.component.net.socket.UdpSocket.receive(UdpSocket.CDB:58)
at com.tangosol.coherence.component.net.UdpPacket.receive(UdpPacket.CDB:1)
at com.tangosol.coherence.component.util.daemon.queueProcessor.packetProcessor.PacketListener.onNotify(PacketListener.CDB:20)
at com.tangosol.coherence.component.util.Daemon.run(Daemon.CDB:42)
at java.lang.Thread.run(Unknown Source)
Coherence <Error>: Halted the cluster:
Cluster is not running: State=5
[ERROR] Coherence: 2012-01-26 10:56:42.147/355.288Oracle Coherence GE 3.7.1.2 <Error> (thread=main, member=n/a): Failed to restart services: com.tangosol.net.RequestTimeoutException: Timeout while waiting for cluster to stop.
[ERROR] Coherence: 2012-01-26 10:56:51.324/364.465Oracle Coherence GE 3.7.1.2 <Error> (thread=main, member=n/a): Failed to restart services: com.tangosol.net.RequestTimeoutException: Timeout while waiting for cluster to stop.
...... (error repeats)And the newly re-joined member 4, which had been restarting services and claiming partitions from the newly-dead member 2, appears to restart execution of the entry processor but then complains that its thread was interrupted: I am not sure why this happens or what it means.
[INFO ] Coherence: 2012-01-26 10:56:52.685/365.879Oracle Coherence GE 3.7.1.2 <Info> (thread=DistributedCache:jdw-read-request-service, member=4): Restarting NamedCache: coherence.common.sequencegenerators
[ERROR] Coherence: 2012-01-26 10:56:52.686/365.880Oracle Coherence GE 3.7.1.2 <Error> (thread=DistributedCache:jdw-read-request-service, member=4): This thread was interrupted while waiting for the results of a request:
Poll
PollId=2, active
InitTimeMillis=1327597012685
Service=DistributedCacheForSequenceGenerators (60)
RespondedMemberSet=[]
LeftMemberSet=[]
RemainingMemberSet=[4]
},Meanwhile, my client, who ran the invoke() with the EntryProcessor, has received a message stating "no storage enabled members exist," which although it may be true doesn't seem like it's really the cause of the problem.
Could I be having problems because all my cluster members are executing the same kind of long-running EntryProcessor and all of them are getting service guardian timeouts at around the same time? How do I deal with that? For example, what if a database is running very slowly one day and my entry processors all start to execute slowly? I don't want my whole grid having problems. Should I, for example, limit the number of concurrent EntryProcessors to < count of grid members by using a LimitFilter?
What does it mean that there was a timeout waiting for the cluster to stop?
And what about the client? If I get an exception after running a grid command, is it valid to wait a few seconds for things to stabilize and then try again? What's my best bet as far as that goes?
Thanks! And let me know if I should file a support request instead.rehevkor5 wrote:
I appreciate the responses so far, but unfortunately they give me no new information.
I am aware that I can try to avoid timeouts by using the PriorityTask API and heartbeats, but that still gives me no guarantee that I will not run into a deadlock situation and encounter a timeout. That is fine as long as my grid can deal with it. Currently, it does not behave well when that happens (all members eventually die). I challenge anyone reading this post to try running an entry processor on their grid that is designed to time out (not by using sleep() as that is interruptable via a soft timeout). All your members will probably encounter the timeout at the same time, and it probably will not end well. If, however, you can handle this situation or have some approach that mitigates it, I would love to hear from you!
I am also aware that I can disable the service guardians, or configure them to only log and take no action. However, this leaves me vulnerable to deadlocks.
Therefore, I would still appreciate any responses that address either of these two issues:
1. Configuration changes or other fixes that allow my members to recover successfully from a service timeout
2. Operational best practices that allow my grid to continue running even if an entry processor that is running on every member of the grid times out at the same time. For example, limiting the number of concurrent entry processors.One operational best practice is design your system so you can't get into a deadlock. If it can get into a deadlock once, it can get into it many times. If a system does that, it is not a well-behaving or well-designed system.
If your code can get into a deadlock across the cluster, that usually means that you are trying to do something which you should not have, like trying to operate on multiple resources in an arbitrary order while holding locks on them (e.g. violating the threading guidelines), which is the typical case of a distributed deadlock, and against which you can guard with ordering your multiple locking operations in a consistent order, but you should not expect Coherence to retry and possibly get into the same problem, as all you would achieve with it is that you converted the deadlock into a livelock.
Coherence is not supposed to guard against your errors. With the guardian it gives you a way to find out what your error is, but it should not attempt the impossible by trying to correct it. You should design your system so that it does not have this kinds of errors.
If you think there is a specific reproducible problem in how Coherence reacts to your code which can bring down the system, then create a test case and submit it in a SR. The kinds of exceptions you get make it possible that it may be necessary. If it is indeed Coherence's fault that it dies and not something you did, then I am fairly certain that it will be given quite high priority considering it is an error which can bring a cluster down.
Coherence server-side constructs have an API contract. Single foremost aspect of that is that the operations complete without an error (unless otherwise documented) within a small period of time. If it goes against this then it has to provide feedback or customization with PriorityTask/GuardSupport. A code which can deadlock goes against this contract. After all we are speaking about a grid, not a distributed process manager.
I agree that the grid should not die due to a deadlock, but you should not expect Coherence to fix a deadlock either. But dying due to an exception and having a distributed deadlock is two different and independent issues.
Best regards,
Robert
Edited by: robvarga on Feb 3, 2012 10:12 AM
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