Home » Modeling » EMF » [CDO] Crash on CDO after restart when using mongodb store
| [CDO] Crash on CDO after restart when using mongodb store [message #929235] |
Mon, 01 October 2012 05:59  |
Eclipse User |
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Hi,
We have developed an application that conects to a CDO repository. We configured the CDO (version 4.1) to use a db store and we tried with Derby and Postgre, and everything worked ok. But, if we changed the store to be mongodb, we are unable to restart the application correctly.
The first time we start the CDO repo using Mongo DB and the application, everything works. The CDO is initialized and after starting the application up we are able to query the CDO repository and store and fetch data. The problem appears when we stop the CDO repository and application and we try to start them up again. First, the CDO starts correctly, without throwing any warning, but when we start the application that connects to the CDO repo, we get the following stacktrace:
!ENTRY org.eclipse.net4j 4 0 2012-10-01 10:53:05.832
!MESSAGE Root resource has not been initialized in Repository[sports-catalogue]
!STACK 0
java.lang.IllegalStateException: Root resource has not been initialized in Repository[sports-catalogue]
at org.eclipse.emf.cdo.internal.server.SessionManager.ensureRootResourceInitialized(SessionManager.java:266)
at org.eclipse.emf.cdo.internal.server.SessionManager.openSession(SessionManager.java:223)
at org.eclipse.emf.cdo.server.internal.net4j.protocol.OpenSessionIndication.responding(OpenSessionIndication.java:117)
at org.eclipse.emf.cdo.server.internal.net4j.protocol.CDOServerIndicationWithMonitoring.responding(CDOServerIndicationWithMonitoring.java:170)
at org.eclipse.net4j.signal.IndicationWithMonitoring.responding(IndicationWithMonitoring.java:92)
at org.eclipse.net4j.signal.IndicationWithResponse.doExtendedOutput(IndicationWithResponse.java:98)
at org.eclipse.net4j.signal.Signal.doOutput(Signal.java:298)
at org.eclipse.net4j.signal.IndicationWithResponse.execute(IndicationWithResponse.java:67)
at org.eclipse.net4j.signal.IndicationWithMonitoring.execute(IndicationWithMonitoring.java:65)
at org.eclipse.net4j.signal.Signal.runSync(Signal.java:253)
at org.eclipse.net4j.signal.Signal.run(Signal.java:149)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
When I try to debug the CDO source code, I see that, as it is a restart, the rootResourcdId is not created, but read and it is returning a null value. The null value returned is because the following query, which runs against Mongo DB, doesn't return any result:
db.commits.find({ "revisions.cdo_class" : { "$in" : [ 0 , 0]} , "revisions.cdo_version" : { "$gte" : 1} , "revisions.cdo_container" : 0 , "revisions.name" : null })
The thing is that in my Mongo DB instance, I don't have anything that matches:
"revisions.cdo_class" : { "$in" : [ 0 , 0]}
Any idea? Am I missing anything?
I have attached the cdo-server.xml config file used.
Thanks.
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| Re: [CDO] Crash on CDO after restart when using mongodb store [message #929276 is a reply to message #929235] |
Mon, 01 October 2012 06:33  |
| Eclipse User |
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Am 01.10.2012 11:59, schrieb Joaquin Guillen:
> Hi,
>
> We have developed an application that conects to a CDO repository. We configured the CDO (version 4.1) to use a db store and we tried with Derby and Postgre, and everything worked ok. But, if we changed the store to be mongodb, we are unable to restart the application correctly.
>
> The first time we start the CDO repo using Mongo DB and the application, everything works. The CDO is initialized and after starting the application up we are able to query the CDO repository and store and fetch data. The problem appears when we stop the CDO repository and application and we try to start them up again. First, the CDO starts correctly, without throwing any warning, but when we start the application that connects to the CDO repo, we get the following stacktrace:
>
> !ENTRY org.eclipse.net4j 4 0 2012-10-01 10:53:05.832
> !MESSAGE Root resource has not been initialized in Repository[sports-catalogue]
> !STACK 0
> java.lang.IllegalStateException: Root resource has not been initialized in Repository[sports-catalogue]
> at org.eclipse.emf.cdo.internal.server.SessionManager.ensureRootResourceInitialized(SessionManager.java:266)
> at org.eclipse.emf.cdo.internal.server.SessionManager.openSession(SessionManager.java:223)
> at org.eclipse.emf.cdo.server.internal.net4j.protocol.OpenSessionIndication.responding(OpenSessionIndication.java:117)
> at org.eclipse.emf.cdo.server.internal.net4j.protocol.CDOServerIndicationWithMonitoring.responding(CDOServerIndicationWithMonitoring.java:170)
> at org.eclipse.net4j.signal.IndicationWithMonitoring.responding(IndicationWithMonitoring.java:92)
> at org.eclipse.net4j.signal.IndicationWithResponse.doExtendedOutput(IndicationWithResponse.java:98)
> at org.eclipse.net4j.signal.Signal.doOutput(Signal.java:298)
> at org.eclipse.net4j.signal.IndicationWithResponse.execute(IndicationWithResponse.java:67)
> at org.eclipse.net4j.signal.IndicationWithMonitoring.execute(IndicationWithMonitoring.java:65)
> at org.eclipse.net4j.signal.Signal.runSync(Signal.java:253)
> at org.eclipse.net4j.signal.Signal.run(Signal.java:149)
> at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
> at java.lang.Thread.run(Thread.java:662)
>
> When I try to debug the CDO source code, I see that, as it is a restart, the rootResourcdId is not created, but read and it is returning a null value. The null value returned is because the following query, which runs against Mongo DB, doesn't return any result:
>
> db.commits.find({ "revisions.cdo_class" : { "$in" : [ 0 , 0]}
The two zeros look suspicious to me. They're probably meant to be internal classifier IDs. But according to
Classes.mapNewClassifier() these IDs can't be zero. I have currently no MongoDB installed (nor have I looked at the
MongoDBStore for a year or two). Can you try to find out with the debugger why the classifiers have no mapped IDs?
Especially if/when (or why not) Classes.initialize() and Commits.initializeClassifiers() are called:
private void initialize()
{
if (!initialized)
{
Commits commits = store.getCommits();
commits.initializeClassifiers();
initialized = true;
}
}
Cheers
/Eike
----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper
> , "revisions.cdo_version" : { "$gte" : 1} , "revisions.cdo_container" : 0 , "revisions.name" : null })
>
> The thing is that in my Mongo DB instance, I don't have anything that matches:
>
> "revisions.cdo_class" : { "$in" : [ 0 , 0]}
>
> Any idea? Am I missing anything?
>
> I have attached the cdo-server.xml config file used.
>
> Thanks.
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