Shared object over cluster
I have 2 oc4j servers, which are "independent" but have same functionality. I would share one object between them (with hashMap). Object should be something like singleton - only one instance exists and 2 servers share it.
I think solution is cluster this 2 servers (with no load balancing) but I don't know how configure servers to be clustered to share this object and what kind of object it should be.
Hi Ehab,
I can give you a clear answer for your first question. If you want to use CFS (I assume you mean the global file system provided by Sun Cluster). This can only be used as part of SC. Reason is that in order to make the filesystem highly available SC takes care of replicating metadata operations to other nodes in the cluster, so that in case of a node crash, you still have a valid and up-to-date structure of your data available.
The architecture for QFS is different. (I must admit that I am not an expert for QFS, so use this information with care). shared QFS can be configured as multi-writer. But QFS has no HA metadata server by design. In a (Sun) clustered environments, you would cluster this metadata server.
You should check the QFS documentation if you need more information.
Hope this helps.
Regards
Hartmut
Similar Messages
-
Confusion about shared objects...
Hi...
I'm building an application using JSP/Servlet technology and I've ecountered some behavior that is not that unexpected, but is something I can't seem to figure out how to get around.
I've been using two reference manuals over the last year, to learn JSP/Servlet development and I'm not sure that either one of them, do a very good job of explaining how to avoid the problem I'm seeing. (Or maybe they do, but I'm just too dense to figure it out.)
Both are O'Reilly manuals:
Java Servlet Programming - Jason Humber with William Crawford
Java Server Pages - Hans Bergsten
Anyway, I've tried to model my application using a MVC approach.
My controller servlet UserCtl.java is small and routes requests as a controller should.
My business logic is in a bean. UserBean.java This object has properties that represent the fields from my UserMaster table and corresponding setter/gettter methods. It also has methods to retrieve an individual user record, insert a record, update a record, delete a record and retrieve a list of records.
The scenario I'm experiencing is as follows:
I bring up my application in the browser on two different PC's.
I display the user list on each PC.
Now...
On each PC, I simultaneously click the Update User, selecting user 1 on pc 1 and user 2 on pc 2.
My application then, creates a record in a lock file, for each user record. This seems to work properly, even during the simultaneous click.
However...
When the update form is subseqently displayed, I have a situation where the form on each of the 2 pc's contains the same data.
I can verify that 2 different lock records were created, indicating that I did not click the same user by accident, however, the data in the form is clearly for only one of the users.
I've read the sections over and over and I feel like I understand their comments on concurrency and how the condition I'm seeing could occur, however, I've tried many things to overcome this and nothing seems to work.
Originally, I opened my JDBC database connection at the servlet level. I've subsequently tried doing it when I create the bean in the controller and subsequent to that, creating the connection object within the method that retrieves the user data inside the bean.
I've tried moving all my code into functions, so that any bean variables would be localized.
I've creating a bean from the JSP session bean object and then retrieving the record, and putting the bean back into the session object before moving to the update page.
Note... I've also enclosed my record retrieval code within a synchronize block.
I'm at a complete loss here. Nothing I do seems to work and I can consistently recreate this condition. Obviously, I can't move forward until I find out how to do this properly.
I'm disappointed in the Java Server Pages book, because the author encapsulated/wrapped all of his database i/o into his own database management routines.
This is a terrible practice for an author to perform. I understand the concept of why you would do that, however, it complicates learning the fundamentals first. I say show us how to do it the long way first, then show us how to improve on the implementation. Don't confuse an already complicated process with your own home-grown methodology.
Anyway... I digress. Can anybody give me any pointers or recommend a good book or web based example, that can show me how to overcome the issue I am encountering? My implementation is a straightforward, simple, approach. I am trying to grasp how this stuff works, without adding in all the extra stuff like tag libraries and XSLT, etc.
I just need to understand how to write a simple thread-safe application. I'll tackle the other stuff later. Oh... by the way... I have built the simple samples that overcome servlet class level counters that show the result differences between global variables at the servlet instance level versus reporting back localized variable values. I think that JDBC database access and/or bean creation, is more complex than that and that's where my problem is.
Any comments, pointers, references to simple samples, will be greatly appreciated.
Thanks,
BrettYou do not need a shared files system - that is just for
convenience. You do need to have identical directory stuctures
for all instances in the cluster.
Mike.
"Tomato Bug" <[email protected]> wrote:
>
>hi all,
> I have a confusion with shared objects in cluster.
> A cluster needs a shared file system to store
> configuration
>files and shared objects. Can I only put the shared things
>in the
>shared file system but not put them on the servers in
>the cluster.
> Thanks.
>
> Tomato.
-
Hi Gurus,
I'm trying to upgrade my test 9.2.0.8 rac to 10.1 rac. I cannot upgrade to 10.2 because of RAM limitations on my test RAC. 10.1 Clusterware software was successfully installed and the daemons are up with OCR and voting disk created. Then during the installation of RAC software at the end, root.sh needs to be run. When I run root.sh, it gave the error: while loading shared libraries: libpthread.so.0: cannot open shared object file: No such file or directory. I have libpthread.so.0 in /lib. I looked up on metalink and found Doc ID: 414163.1 . I unset the LD_ASSUME_KERNEL in vipca (unsetting of LD_ASSUME_KERNEL was not required in srvctl because there was no LD_ASSUME_KERNEL in srvctl). Then I tried to run vipca manually. I receive the following error: Error 0(Native: listNetInterfaces:[3]). I'm able to see xclock and xeyes. So its not a problem with x.
OS: OEL5 32 bit
oifcfg iflist
eth0 192.168.2.0
eth1 10.0.0.0
oifcfg getif
eth1 10.0.0.0 global cluster_interconnect
eth1 10.1.1.0 global cluster_interconnect
eth0 192.168.2.0 global public
cat /etc/hosts
192.168.2.3 sunny1pub.ezhome.com sunny1pub
192.168.2.4 sunny2pub.ezhome.com sunny2pub
192.168.2.33 sunny1vip.ezhome.com sunny1vip
192.168.2.44 sunny2vip.ezhome.com sunny2vip
10.1.1.1 sunny1prv.ezhome.com sunny1prv
10.1.1.2 sunny2prv.ezhome.com sunny2prv
My questions are:
should ping on sunny1vip and sunny2vip be already working? As of now they dont work.
if you look at oifcfg getif, I initially had eth1 10.0.0.0 global cluster_interconnect,eth0 192.168.2.0 global public then I created eth1 10.1.1.0 global cluster_interconnect with setif. Should it be 10.1.1.0 or 10.0.0.0. I looked at the subnet calculator and it says for 10.1.1.1, 10.0.0.0 is the subnet. In metalink they had used 10.10.10.0 and hence I used 10.1.1.0
Any ideas on resolving this issue would be very much appreciated. I had been searching on oracle forums, google, metalink but all of them refer to DOC Id 414163.1 but it does n't seem to work. Please help. Thanks in advance.
Edited by: ayyappa on Aug 20, 2009 10:13 AM
Edited by: ayyappa on Aug 20, 2009 10:14 AM
Edited by: ayyappa on Aug 20, 2009 10:15 AMa step forward towards resolution but i need some help from the gurus.
root# cat /etc/hosts
127.0.0.1 localhost.localdomain localhost
::1 localhost6.localdomain6 localhost6
192.168.2.3 sunny1pub.ezhome.com sunny1pub
192.168.2.4 sunny2pub.ezhome.com sunny2pub
10.1.1.1 sunny1prv.ezhome.com sunny1prv
10.1.1.2 sunny2prv.ezhome.com sunny2prv
192.168.2.33 sunny1vip.ezhome.com sunny1vip
192.168.2.44 sunny2vip.ezhome.com sunny2vip
root# /u01/app/oracle/product/crs/bin/oifcfg iflist
eth1 10.0.0.0
eth0 192.168.2.0
root# /u01/app/oracle/product/crs/bin/oifcfg getif
eth1 10.0.0.0 global cluster_interconnect
eth0 191.168.2.0 global public
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny1pub -a
****ORACLE_HOME environment variable not set!
ORACLE_HOME should be set to the main directory that contain oracle products. set and export ORACLE_HOME, then re-run.
root# export ORACLE_BASE=/u01/app/oracle
root# export ORACLE_HOME=/u01/app/oracle/product/10.1.0/Db_1
root# export ORA_CRS_HOME=/u01/app/oracle/product/crs
root# export PATH=$PATH:$ORACLE_HOME/bin
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny1pub -a
VIP does not exist.
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl add nodeapps -n sunny1pub -o $ORACLE_HOME -A 192.168.2.33/255.255.255.0
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl add nodeapps -n sunny2pub -o $ORACLE_HOME -A 192.168.2.44/255.255.255.0
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny1pub -a
VIP exists.: sunny1vip.ezhome.com/192.168.2.33/255.255.255.0
root# /u01/app/oracle/product/10.1.0/Db_1/bin/srvctl config nodeapps -n sunny2pub -a
VIP exists.: sunny2vip.ezhome.com/192.168.2.44/255.255.255.0
Once I execute the add nodeapps command as root on node 1, I was able to get vip exists for config nodeapps on node 2. The above 2 statements resulted me with same values on both nodes. After this I executed root.sh on both nodes, I did not receive any errors. It said CRS resources are already configured.
My questions to the gurus are as follows:
Should ping on vip work? It does not work now.
srvctl status nodeapps -n sunny1pub(same result for sunny2pub)
VIP is not running on node: sunny1pub
GSD is not running on node: sunny1pub
PRKO-2016 : Error in checking condition of listener on node: sunny1pub
ONS daemon is not running on node: sunny1pub
[root@sunny1pub ~]# /u01/app/oracle/product/crs/bin/crs_stat -t
Name Type Target State Host
ora....pub.gsd application OFFLINE OFFLINE
ora....pub.ons application OFFLINE OFFLINE
ora....pub.vip application OFFLINE OFFLINE
ora....pub.gsd application OFFLINE OFFLINE
ora....pub.ons application OFFLINE OFFLINE
ora....pub.vip application OFFLINE OFFLINE
Will crs_stat and srvctl status nodeapps -n sunny1pub work after I upgrade my database or should they be working now already? I just choose to install 10.1.0.3 software and after running root.sh on both nodes, I clicked ok and then the End of installation screen appeared. Under installed products, I see 9i home, 10g home, crs home. Under 10g home and crs home, I see cluster nodes(sunny1pub and sunny2pub) So it looks like the 10g software is installed. -
Which role do I need DFS or File server on fail over cluster server 2012 R2?
what I want to achieve is that I want to share all my user data files in a central location and to be highly available all the time whether it's a general share or folder redirection data. BUT I'm a bit confused; I have fail over cluster set-up
on server 2012, now I would like to add DFS as a role but than we have another role called File server and virtually it does the same thing as DFS? Means it creates a namespace share that can be access even one of the nodes goes down. Now I am thinking is
that DFS does the replication between two physical location but fail over cluster works slightly differently and with file server it pretty much does the same thing except for replicating data from one drive to another. Now what do you suggest I do or
did I get the concept wrong like a noob?DFS and Failover Clustering for file shares provides a similar end result for file access, but they are significantly different implementations.
Clustering provides high availability to files by presenting shared access to set a files served from a cluster. With 2012 R2 Microsoft added the ability to create a Scale-out File Server that even allows all nodes of the cluster to server access to
the files for a higher level of performance and other great things. Bottom line with Failover Clusters for files is that there is a single copy of the file presented from the cluster.
DFS on the other hand provides high availability to files by presenting multiple copies of the file by making a copy in two or more locations and presenting a naming space that allows access to the file through any of the network paths. DFS works very
well for files that are primarily read-only. When you get into a situation where there is a lot of updating of the shared files, DFS is not a very good solution. There are ways to implement DFS for read/write files, but it generally requires a
good knowledge of how the files are used and how you want to manage them.
The key to answering your question comes in your first sentence "I want to share all my user data files in a central location and to be highly available all the time". My initial reaction to this is that central location means Failover Cluster
- there is only a single copy of the file. However, "all the time" can be compromised by network failures to the central site. Remote sites would not have access if they can't access the central site. DFS provides the ability to
have copies remotely, but then if you allow updating at multiple sites, you have to manage the merging of the changes, among other things.
. : | : . : | : . tim -
Help with shared objects...again...
Okay, I've been looking at a really good tutorial for shared objects in AS2, and I think I've gotten the basic concept down of how they work... now the problem lies in just integrating it into what I already have, which is making my brain hurt. Basically its for a quiz game, which will have a dynamic scoreboard. I want the scores in the shared object to update when the submit button is pressed, and then have the new values loaded into text boxes. Displaying the values is going to be the easy part, its just updating them is what my brain doesnt want to wrap itself around. Here is the array I have at the moment (yes, horribly inefficient, but the last time I actually did any coding before this was over 2 years ago when I was still a computer science major... with all of 4 actual Comp Sci courses under my belt -_-)
scores= new Array();
names= new Array();
insert=function() {
var newscore;
var newname;
newscore=0
newscore=_global.correct;
if (newscore > scores[0]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=scores[6];
scores[6]=scores[5];
scores[5]=scores[4];
scores[4]=scores[3];
scores[3]=scores[2];
scores[2]=scores[1];
scores[1]=scores[0];
scores[0]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=names[6];
names[6]=names[5];
names[5]=names[4];
names[4]=names[3];
names[3]=names[2];
names[2]=names[1];
names[1]=names[0];
names[0]=newname;
else if (newscore > scores[1]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=scores[6];
scores[6]=scores[5];
scores[5]=scores[4];
scores[4]=scores[3];
scores[3]=scores[2];
scores[2]=scores[1];
scores[1]=newscore
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=names[6];
names[6]=names[5];
names[5]=names[4];
names[4]=names[3];
names[3]=names[2];
names[2]=names[1];
names[1]=newname;
Continues all the way down to scores[14]
Now, if I wanted this to pull data from the shared object, would I just put user_so.score[3]=user_so.score[2] for instance? Or would I run the array and just update the new valued individually once the array insertion function completes? THe problem with the latter is that it's not directly accessing the shared object so I'd need to find a way to pull them out into other variables first, and this is about the point where my brain just decides to short out on me and stop working alltogether...yay...
So yea, any help on this would be much appreciated.
also, would the array have to be declared within the shared object as well? If so, how would I do that exactly? Probably something so simple but the fact that it's shared objects is throwing me off...Ok, the shared object WAS working just fine until I had the banner start referencing it. Then the quiz began giving me syntax errors like crazy, and even when the banner isnt runnit it gives me issues.
user_so.data.soArray[0]=scores[0];
user_so.data.soArray[1]=scores[1];
user_so.data.soArray[2]=scores[2];
user_so.data.soArray[3]=scores[3];
user_so.data.soArray[4]=scores[4];
user_so.data.soArray[5]=scores[5];
user_so.data.soArray[6]=scores[6];
user_so.data.soArray[7]=scores[7];
user_so.data.soArray[8]=scores[8];
user_so.data.soArray[9]=scores[9];
user_so.data.soArray[10]=scores[10];
user_so.data.soArray[11]=scores[11];
user_so.data.soArray[12]=scores12];
user_so.data.soArray[13]=scores[13];
user_so.data.soArray[14]=scores[14];
_global.player= "Input Name";
player.text=_global.player;
_global.correct= 0;
phrase=" ";
gotoAndStop (1);
these are the lines it's telling me I need an on handler for, which I do have, at the very start of the entire code.
Ive counted the brackets and those seem to line up, but I'll double check again. The code is on the submit button itself (yes I know it's poor coding form, but this is how I learned it and what I'm used to, and since I'm on a bit of a time schedule now isn't the time to completely re-learn the proper conventions and etiquite of coding in flash).
on (release) {
if (user_so.data.tname!=undefined){
user_so.data.tname = _global.player;
user_so.data.newscore = _global.correct;
insert=function() {
var newscore;
var newname;
newscore=0
newscore=_global.correct;
if (newscore > scores[0]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=scores[6];
scores[6]=scores[5];
scores[5]=scores[4];
scores[4]=scores[3];
scores[3]=scores[2];
scores[2]=scores[1];
scores[1]=scores[0];
scores[0]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=names[6];
names[6]=names[5];
names[5]=names[4];
names[4]=names[3];
names[3]=names[2];
names[2]=names[1];
names[1]=names[0];
names[0]=newname;
else if (newscore > scores[1]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=scores[6];
scores[6]=scores[5];
scores[5]=scores[4];
scores[4]=scores[3];
scores[3]=scores[2];
scores[2]=scores[1];
scores[1]=newscore
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=names[6];
names[6]=names[5];
names[5]=names[4];
names[4]=names[3];
names[3]=names[2];
names[2]=names[1];
names[1]=newname;
else if (newscore > scores[2]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=scores[6];
scores[6]=scores[5];
scores[5]=scores[4];
scores[4]=scores[3];
scores[3]=scores[2];
scores[2]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=names[6];
names[6]=names[5];
names[5]=names[4];
names[4]=names[3];
names[3]=names[2];
names[2]=newname;
else if (newscore > scores[3]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=scores[6];
scores[6]=scores[5];
scores[5]=scores[4];
scores[4]=scores[3];
scores[3]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=names[6];
names[6]=names[5];
names[5]=names[4];
names[4]=names[3];
names[3]=newname;
else if (newscore > scores[4]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=scores[6];
scores[6]=scores[5];
scores[5]=scores[4];
scores[4]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=names[6];
names[6]=names[5];
names[5]=names[4];
names[4]=newname;
else if (newscore > scores[5]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=scores[6];
scores[6]=scores[5];
scores[5]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=names[6];
names[6]=names[5];
names[5]=newname;
else if (newscore > scores[6]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=scores[6];
scores[6]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=names[6];
names[6]=newname;
else if (newscore > scores[7]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=scores[7];
scores[7]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=names[7];
names[7]=newname;
else if (newscore > scores[8]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=scores[8];
scores[8]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=names[8];
names[8]=newname;
else if (newscore > scores[9]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=scores[9];
scores[9]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=names[9];
names[9]=newname;
else if (newscore > scores[10]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=scores[10];
scores[10]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=names[10];
names[10]=newname;
else if (newscore > scores[11]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=scores[11];
scores[11]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=names[11];
names[11]=newname;
else if (newscore > scores[12]) {
scores[14]=scores[13];
scores[13]=scores[12];
scores[12]=newscore;
names[14]=names[13];
names[13]=names[12];
names[12]=newname;
else if (newscore > scores[13]) {
scores[14]=scores[13];
scores[13]=newscore;
names[14]=names[13];
names[13]=newname;
else if (newscore > scores[14]) {
scores[14]=newscore;
names[14]=newname;
else {
user_so.data.tname = _global.player;
user_so.data.newscore = _global.correct;
scores[0]=user_so.data.newscore;
names[0]=user_so.data.tname;
user_so.data.soArray[0]=scores[0];
user_so.data.soArray[1]=scores[1];
user_so.data.soArray[2]=scores[2];
user_so.data.soArray[3]=scores[3];
user_so.data.soArray[4]=scores[4];
user_so.data.soArray[5]=scores[5];
user_so.data.soArray[6]=scores[6];
user_so.data.soArray[7]=scores[7];
user_so.data.soArray[8]=scores[8];
user_so.data.soArray[9]=scores[9];
user_so.data.soArray[10]=scores[10];
user_so.data.soArray[11]=scores[11];
user_so.data.soArray[12]=scores12];
user_so.data.soArray[13]=scores[13];
user_so.data.soArray[14]=scores[14];
_global.player= "Input Name";
player.text=_global.player;
_global.correct= 0;
phrase=" ";
gotoAndStop (1); -
Data Logging a programmatically created shared variable of cluster or array datatype into citadel DB
Hi,
Is there a way to log a programmatically created shared variable of cluster or array datatype into citadel DB?
I have attempted to programmatically create a shared variable of type 'double' and was able to successfully log the same into Citadel DB. In the attachment, Please refer to the attached project SV_TC.lvproj and specifically to SV_W.vi for the code that i have used (W.png file shows the dB in MAX and shared variable in NI Distributed System Manager)
However when i tried the same approach to create a shared variable 'array of double', i noticed that traces are not getting created and hence data logging isn't happening into the Citadel DB. I was however able to write and read the shared variable array without issues. The same is true with cluster datatype also. Please refer to SN_NW.vi for the code that i have used - only difference from SV_W.vi is that i have tried to create a shared variable of type 'array of double'
One observation is that if i create an 'array of double' or cluster in a shared variable library using the project explorer and deploy, i could see that these being logged into Citadel DB.
Hence i want to understand what could be done to achieve the same programmatically? Could you please advice?
Regards,
Sridhar
Attachments:
SV_TC.zip 3925 KBWhy is the transaction happening over remote?
Because we need the information to be on our database immediately when they submit it.
I don't know anything about streams or replication.....
The web database is run by the company that hosts our web site. We use PL/SQL to show the pages and output the html. It fetches the data the customer is requesting from our database, but I'm struggling to get the best way to insert into our database from there. -
Is my installation of SQL Server Fail Over cluster correct?
I made a 2 node SQL Server 2012 fail over cluster but having some problems during installation so I wanted to know if the steps below I performed are correct.
Hardware
Node1 192.168.1.10
Node2 192.168.1.11
Added following entries in DNS
cluster.domain.local 192.168.1.12 (for Windows Cluster)
msdtc.domain.local 192.168.1.13 (for MSDTC)
sql.domain.local 192.168.1.14 (for SQL Server Cluster)
Cluster Storage
Disk1 (for Quorum)
Disk2 (for MSDTC
Disk3 (for SQL Server)
Now comes the installation. I am performing all these steps as DOMAIN ADMIN.
1. First I installed clustering role on both nodes
2. Then I ran fail over validation wizard on Node1 adding both nodes which went fine (there were some warnings)
3. Then I made a Windows Cluster on Node1 using these two nodes. I gave the name and IP to this cluster which I wrote above i.e. cluster.domain.local 192.168.1.12
4. Cluster was created and boths nodes are UP.
Now I want to ask a question here. Is it best practice to perform the above operation using DOMAIN ADMIN? Or if I use a standard domain user account with local admin rights, will it work? If not then exactly what rights are required to perform this operation.
5. Then I installed "Application Server" role on both Node1 and Node2 and also added "Distributed Transaction" feature
6. Then I right clicked on Windows Cluster I created and added a new role/feature which is "DTC"
7. I gave it the same name which I wrote above i.e. msdtc.domain.local 192.168.1.13
8. MSDTC was created but when it tried to UP its service, it threw an error. Upon investigation it turns out the Windows Cluster cluster.domain.local doesn't have proper rights to created some objects in AD. I didn't know what rights to give so I gave it full
permission and after that when I created MSDTC again, the service went up fine.
So I want to know what rights does cluster.domain.com require to make MSDTC?
Am I doing good so far?Hello,
>>Then I made a Windows Cluster on Node1 using these two nodes. I gave the name and IP to this cluster which I wrote above i.e. cluster.domain.local 192.168.1.10
Hello I suppose this IP was physical node IP windows cluster IP was 192.168.1.12 I suppose yo must have given this IP as windows cluster IP.10 and 11 are physical nodes in Cluster but 12 is Cluster IP .Correct me if I am wrong.
Did you do failover and failback to check whether cluster is configured correctly or not ,If not please do it .
>>Then I ran fail over validation wizard on Node1 adding both nodes which went fine (there were some warnings)
Please remove warnings also ,it might cause issue.Not sure its correct every time but make sure cluster validation should be free of error and warning.
>>Now I want to ask a question here. Is it best practice to perform the above operation using DOMAIN ADMIN?
You can do it with domain admin account as this is required to create Cluster NAme object(CNO) in domain and local account might not have that right so I would say its ok.
>>I gave it the same name which I wrote above i.e. msdtc.domain.local
192.168.1.11
again this IP is node 2 IP how can you give it to MSDTC.Use below link for reference
http://blogs.msdn.com/b/cindygross/archive/2009/02/22/how-to-configure-dtc-for-sql-server-in-a-windows-2008-cluster.aspx
Please mark this reply as the answer or vote as helpful, as appropriate, to make it useful for other readers -
Hi All,
We have a windows fail over cluster having one windows machine on local network as one of its node.
I want to add a virtual cloud machine available on microsoft azure as another node to this existing cluster.
Please suggest how to do this?
Thanking all in advance,
RaghvendraBefore you even start working on the SQL side, you will need to create a Windows Server 2008 R2 cluster with no shared storage. You can actually test that in-house. Create a VM running 2008 R2 and cluster it with your physical (from your description,
I am assuming physical) 2008 R2 machine. Create it with a file share witness for quorum. Then configure your environment to see that it works as expected.
Once you know how to configure the cluster between physical and VM with a file share witness, build it to Azure. The location of the FSW gets to be an interesting choice. To have a FSW in Azure means that you will need another VM in Azure to
host the file share, meaning you have two quorum votes in Azure and one in-house. Or, you could create a file share witness on an in-house system, giving you two quorum votes in-house and one in Azure.
In the FSW in Azure scenario, if you have a loss of the in-house server, automatic failover occurs because two quorum votes exist in Azure. With FSW in-house, depending on the loss you have in-house, you might have to force quorum to get the Azure
single-node cluster to run. Loss of access to Azure reverses those scenarios. Neither one is optimal, but it does provide some level of recoverability.
. : | : . : | : . tim -
Will the Application Scope be shared across the cluster in a multi-node OC4
Hi,
I have the following requirement:
Users of the application can only have single (browser) session. When a user who already has a session connects again, he should no longer be allowed to access the older session.
My proposed implementation is:
- After successful login – possibly using a Session Listener - an entry is made in a HashMap UserSessions that lives in the application scope. Key is the username, value is the session id (HttpSession.getId()).
- For every request, using a ServletFilter, we check whether the session is still in the UserSessions HashMap for the current user. If a new session has been created for the same user, the session id for that new session is in the UserSessions map and the servletfilter will not find the session. In that case, the filter should invalidate the session and forward to the user to an error page.
However, the application will run on a multi-node OC4J cluster. I am starting to wonder:
Will the Application Scope be shared across the cluster in a multi-node OC4J environment?
I know session state can be shared. But what application state/scope?
Does anyone know? Do I have to do anything special in the cluster or the application to get this to work?
Thanks for your help.
Lucasgday Lucas --
Application scope is not replicated across JVM boundaries with OC4J.
I'm sure this used to be described in the doc, but I can't find it now from a quick scan.
If you wanted to use this type of pattern, you could look to use a Coherence cache as distribution mechanism to share objects across multiple JVMs/nodes.
-steve- -
RTMPS remote shared object response failure
Hi i have a chat application written in Flex/Flash (AS3) with a PHP/mysql backend and i am using Adobe® Flash® Media Server 4.5.2
The application is working OK in the night with under 200 rtmps connections but during the day with max 400 rtmps connections i get a strange error
when i am trying to connect to the remote shared object.
For example i have this portion of code:
test_so is my shared object
conn is my connection with the fms server
test_so = SharedObject.getRemote("test_so","rtmps://uri to my application instance",false);
test_so.addEventListener(SyncEvent.SYNC,mySyncFunction);
test_so.connect(conn);
The shared object synchronization is starting, when i receive the first data with the test_so shared object i get a failure that does not raise any event on the flash part.
For example if my received data content length is 40Kb long i receive only 28Kb and the transfer is aborted but the rtmps connection is not closed.
Using some web debugging software (charles and fiddler) i can see when the error appear:
[https://application instance uri] (content-type: application/x-fcs)
/open
- 1
/idle
- ID
- 0 (1 B)
- 3 (9.95 KB)
- 6 (28KB) <-- Failure SSL peer shut down incorrectly (Response code 200) (content length is almost 40KB but i only get 28KB then transfer is ended) (NetStatusEvent does not fire any error in flash)
- 7 (1 B)
- ... the rtmps connection continue but the flash will never receive any SyncEvent.SYNC because of the error on chunk 6
/send
- ID
- 1
- 2
- 4
- 5
Here is a screeshot from charles during debug:
This error appear random but for a lot of clients.
In the FMS logs i do not see any errors.
The server is a XEN VPS with 4 cores and 8GB of ram.
The CPU and ram usage is constant, there are no spikes when the error appear.
The bandwidth usage is more then double when the error appear.
The remote shared object is a little big (over 40K) and maybe combined with the bandwidth problems can raise this error.
I can also reproduce this error when there is little traffic on the server using a bandwidth limiter on client side and setting the limit at 64kb. (i need to put the limit at 128kb for the application to work and to not see that error)
Maybe someone had the same problem.Hi i have a chat application written in Flex/Flash (AS3) with a PHP/mysql backend and i am using Adobe® Flash® Media Server 4.5.2
The application is working OK in the night with under 200 rtmps connections but during the day with max 400 rtmps connections i get a strange error
when i am trying to connect to the remote shared object.
For example i have this portion of code:
test_so is my shared object
conn is my connection with the fms server
test_so = SharedObject.getRemote("test_so","rtmps://uri to my application instance",false);
test_so.addEventListener(SyncEvent.SYNC,mySyncFunction);
test_so.connect(conn);
The shared object synchronization is starting, when i receive the first data with the test_so shared object i get a failure that does not raise any event on the flash part.
For example if my received data content length is 40Kb long i receive only 28Kb and the transfer is aborted but the rtmps connection is not closed.
Using some web debugging software (charles and fiddler) i can see when the error appear:
[https://application instance uri] (content-type: application/x-fcs)
/open
- 1
/idle
- ID
- 0 (1 B)
- 3 (9.95 KB)
- 6 (28KB) <-- Failure SSL peer shut down incorrectly (Response code 200) (content length is almost 40KB but i only get 28KB then transfer is ended) (NetStatusEvent does not fire any error in flash)
- 7 (1 B)
- ... the rtmps connection continue but the flash will never receive any SyncEvent.SYNC because of the error on chunk 6
/send
- ID
- 1
- 2
- 4
- 5
Here is a screeshot from charles during debug:
This error appear random but for a lot of clients.
In the FMS logs i do not see any errors.
The server is a XEN VPS with 4 cores and 8GB of ram.
The CPU and ram usage is constant, there are no spikes when the error appear.
The bandwidth usage is more then double when the error appear.
The remote shared object is a little big (over 40K) and maybe combined with the bandwidth problems can raise this error.
I can also reproduce this error when there is little traffic on the server using a bandwidth limiter on client side and setting the limit at 64kb. (i need to put the limit at 128kb for the application to work and to not see that error)
Maybe someone had the same problem. -
Shared Object working locally but not online
My game records your high score using the sharedobject and while testing it locally it works fine, but when the swf is published and played online, it is not recording the hi score. Is there some sort of new security issue with saving shared objects on people's hard drives now?
In Frame 1 I have this code. The first is for game progress, the second is for the high score which is then passed to the text object
var Progress:SharedObject = SharedObject.getLocal("progress", "/");
var OwlHiScore:SharedObject = SharedObject.getLocal("owlhiscore", "/");
hisc.mainScore.text = (OwlHiScore.data.HiScore).toString();
Then on the last frame where the game is over I have this code:
if (score > OwlHiScore.data.HiScore) {
hiScoreWon = true;
OwlHiScore.data.HiScore = score;
OwlHiScore.flush();
hiScoreHolder.hiScoreEffect.mainScore.text = (OwlHiScore.data.HiScore).toString();
} else {
hiScoreWon = false; -
Error while loading shared libraries: librt.so.1: cannot open shared object
error while loading shared libraries: librt.so.1: cannot open shared object
I cant run my apache server v2.2.3.
Can someone help me?
thanks in advanceThat could be an accessibility issue. Check the user with whom you installed Apache server. Check the user has permissions to access the libraries.
-Mahendra. -
How to Get property values from Shared Object in client's load event - Very urgent
I am using shared object to share data between two users. First user connect to shared object and set some value in shared object. Please consider that second user has not connected with the shared object yet.
Now when second user connects to the server and try to get that property set by first user, he could get shared object but could not get properties of Shared object set by first user. I observed few times that Second user can get these properties within "Sync" event between two users. But I would like to get these values for Second user in any stage (i.e. in load event etc.). Whenever Second user tries to get the property of Shared object, the object will reset the actual property value and then return reset value.
Anyone faced such issue while using shared object between two users. If so, I would appreciate if you could let me know your suggestions for following questions:
1) Is there any way to get all the properties of shared object before sync event called, as I want to get it immediately when second user connect to the application and perform next task based on the values stored in shared object.
2) Is it possible for second user to check whether any property has been set by first user? So that second user can use the property instead of reset it.
Any kind of help would be greatly appreciated.
Thank You.I am using shared object to share data between two users. First user connect to shared object and set some value in shared object. Please consider that second user has not connected with the shared object yet.
Now when second user connects to the server and try to get that property set by first user, he could get shared object but could not get properties of Shared object set by first user. I observed few times that Second user can get these properties within "Sync" event between two users. But I would like to get these values for Second user in any stage (i.e. in load event etc.). Whenever Second user tries to get the property of Shared object, the object will reset the actual property value and then return reset value.
Anyone faced such issue while using shared object between two users. If so, I would appreciate if you could let me know your suggestions for following questions:
1) Is there any way to get all the properties of shared object before sync event called, as I want to get it immediately when second user connect to the application and perform next task based on the values stored in shared object.
2) Is it possible for second user to check whether any property has been set by first user? So that second user can use the property instead of reset it.
Any kind of help would be greatly appreciated.
Thank You. -
Calling shared objects in unix from Forms 6i and 10g
I would like to know how to call shared objects in unix from Froms 6i and 10g. Can anybody help in this regard? Your help is very well appreciated.
Hi,
Do you have any 11i instance where those custom forms are used? If yes, you will have to copy those forms from 11i to R12 instance, open the forms using Forms 10g builder, compile it and upload it back to the server.
Note: 427879.1 - How To Customize And Compile An Application Seeded Form (FMB) Or Library (PLL)?
Note: 743490.1 - Customization in Oracle Applications
Note: 563258.1 - How To Upgrade 11i Custom Forms And Reports To R12
Regards,
Hussein -
Exception handling is not working in GCC compile shared object
Hello,
I am facing very strange issue on Solaris x86_64 platform with C++ code compiled usging gcc.3.4.3.
I have compiled shared object that load into web server process space while initialization. Whenever any exception generate in code base, it is not being caught by exception handler. Even though exception handlers are there. Same code is working fine since long time but on Solaris x86, Sparc arch, Linux platform
With Dbx, I am getting following stack trace.
Stack trace is
dbx: internal error: reference through NULL pointer at line 973 in file symbol.cc
[1] 0x11335(0x1, 0x1, 0x474e5543432b2b00, 0x59cb60, 0xfffffd7fffdff2b0, 0x11335), at 0x11335
---- hidden frames, use 'where -h' to see them all ----
=>[4] __cxa_throw(obj = (nil), tinfo = (nil), dest = (nil), , line 75 in "eh_throw.cc"
[5] OBWebGate_Authent(r = 0xfffffd7fff3fb300), line 86 in "apache.cpp"
[6] ap_run_post_config(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0x444624
[7] main(0x0, 0x0, 0x0, 0x0, 0x0, 0x0), at 0x42c39a
I am using following link options.
Compile option is
/usr/sfw/bin/g++ -c -I/scratch/ashishas/view_storage/build/coreid1014/palantir/apache22/solaris-x86_64/include -m64 -fPIC -D_REENTRANT -Wall -g -o apache.o apache.cpp
Link option is
/usr/sfw/bin/g++ -shared -m64 -o apache.so apache.o -lsocket -lnsl -ldl -lpthread -lthread
At line 86, we are just throwing simple exception which have catch handlers in place. Also we do have catch(...) handler as well.
Surpursing things are..same issue didn't observe if we make it as executable.
Issue only comes if this is shared object loaded on webserver. If this is plain shared object, opened by anyother exe, it works fine.
Can someone help me out. This is completly blocking issue for us. Using Solaris Sun Studio compiler is no option as of now.shared object that load into web server process space
... same issue didn't observe if we make it as executable.When you "inject" your shared object into some other process a well-being of your exception handling depends on that other process.
Mechanics of x64 stack traversing (unwind) performed when you throw the exception is quite complicated,
particularly involving a "nearly-standartized" Unwind interface (say, Unwind_RaiseException).
When we are talking about g++ on Solaris there are two implementations of unwind interface, one in libc and one in libgcc_s.so.
When you g++-compile the executable you get it directly linked with libgcc_s.so and Unwind stuff resolves into libgccs.
When g++-compiled shared object is loaded into non-g++-compiled executable's process _Unwind calls are most likely already resolved into Solaris libc.
Thats why you might see the difference.
Now, what exactly causes this difference can vary, I can only speculate.
All that would not be a problem if _Unwind interface was completely standartized and properly implemented.
However there are two issues currently:
* gcc (libstdc++ in particular) happens to use additional non-standard _Unwind calls which are not present in Solaris libc
naturally, implementation details of Unwind implementation in libc differs to that of libgccs, so when all the standard _Unwind
routines are resolved into Solaris version and one non-standard _Unwind routine is resolved into gcc version you get a problem
(most likely that is what happens with you)
* libc Unwind sometimes is unable to decipher the code generated by gcc.
However that is likely to happen with modern gcc (say, 4.4+) and not that likely with 3.4.3
Btw, you can check your call frame to see where _Unwind calls come from:
where -h -lIf you indeed stomped on "mixed _Unwind" problem then the only chance for you is to play with linker
so it binds Unwind stuff from your library directly into libgccs.
Not tried it myself though.
regards,
__Fedor.
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