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Thread blocks other threads

Skope87

Hello,

We've an application developed under taskapace.

Today, we've experimented that no more threads could connect to docbase. This is the Thread that was blocking the others:

at java/lang/Object.wait(Native Method)
at java/lang/Object.wait(Object.java:231(Compiled Code))
at com/documentum/fc/client/impl/connection/docbase/DocbaseConnection.waitForCorrectTransactionContext(DocbaseConnection.java:696(Compiled Code))
at com/documentum/fc/client/impl/connection/docbase/DocbaseConnection.evaluateRpc(DocbaseConnection.java:976(Compiled Code))
at com/documentum/fc/client/impl/connection/docbase/DocbaseConnection.applyForCollection(DocbaseConnection.java:1124)
at com/documentum/fc/client/impl/docbase/DocbaseApi.exec(DocbaseApi.java:82)
at com/documentum/fc/client/impl/session/Session.query(Session.java:3247)
at com/documentum/fc/client/impl/session/SessionHandle.query(SessionHandle.java:2232)
at com/documentum/fc/client/DfQuery.runQuery(DfQuery.java:161)
at com/documentum/fc/client/DfQuery.execute(DfQuery.java:205)
at com/documentum/fc/client/impl/bof/registry/DocbaseModuleRegistry.getListFromRepository(DocbaseModuleRegistry.java:392(Compiled Code))
at com/documentum/fc/client/impl/bof/registry/DocbaseModuleRegistry.lookupInRepository(DocbaseModuleRegistry.java:216)
at com/documentum/fc/client/impl/bof/registry/DocbaseModuleRegistry.lookupRaw(DocbaseModuleRegistry.java:99)
at com/documentum/fc/client/impl/bof/compoundclass/CompoundClassMgr.lookupTBOMetadata(CompoundClassMgr.java:234)
at com/documentum/fc/client/impl/bof/compoundclass/CompoundClassMgr.getTboClass(CompoundClassMgr.java:204(Compiled Code))
at com/documentum/fc/client/impl/bof/compoundclass/CompoundClassMgr.getImpClass(CompoundClassMgr.java:72(Compiled Code))
at com/documentum/fc/client/impl/objectmanager/AbstractPersistentObjectFactory.getCompoundClassEntry(AbstractPersistentObjectFactory.java:39)
at com/documentum/fc/client/impl/objectmanager/PObjectFactoryWithAspects.makeObject(PObjectFactoryWithAspects.java:48)
at com/documentum/fc/client/impl/objectmanager/PersistentObjectManager.getObjectFromServer(PersistentObjectManager.java:356)
at com/documentum/fc/client/impl/objectmanager/PersistentObjectManager.getObject(PersistentObjectManager.java:311(Compiled Code))
at com/documentum/fc/client/impl/session/Session.getObject(Session.java:832)
at com/documentum/fc/client/impl/session/SessionHandle.getObject(SessionHandle.java:579)
at sun/reflect/NativeMethodAccessorImpl.invoke0(Native Method)
at sun/reflect/NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79(Compiled Code))
at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43(Compiled Code))
at java/lang/reflect/Method.invoke(Method.java:618(Compiled Code))
at com/ibm/ws/webservices/engine/dispatchers/java/JavaDispatcher.invokeMethod(JavaDispatcher.java:178)
at com/ibm/ws/webservices/engine/dispatchers/java/JavaDispatcher.invokeOperation(JavaDispatcher.java:141)
at com/ibm/ws/webservices/engine/dispatchers/SoapRPCProcessor.processRequestResponse(SoapRPCProcessor.java:453)
at com/ibm/ws/webservices/engine/dispatchers/SoapRPCProcessor.processMessage(SoapRPCProcessor.java:414)
at com/ibm/ws/webservices/engine/dispatchers/BasicDispatcher.processMessage(BasicDispatcher.java:134)
at com/ibm/ws/webservices/engine/dispatchers/java/SessionDispatcher.invoke(SessionDispatcher.java:204)
at com/ibm/ws/webservices/engine/PivotHandlerWrapper.invoke(PivotHandlerWrapper.java:228)
at com/ibm/ws/webservices/engine/handlers/jaxrpc/JAXRPCHandler.invoke(JAXRPCHandler.java:152)
at com/ibm/ws/webservices/engine/handlers/WrappedHandler.invoke(WrappedHandler.java:64)
at com/ibm/ws/webservices/engine/PivotHandlerWrapper.invoke(PivotHandlerWrapper.java:228)
at com/ibm/ws/webservices/engine/PivotHandlerWrapper.invoke(PivotHandlerWrapper.java:228)
at com/ibm/ws/webservices/engine/WebServicesEngine.invoke(WebServicesEngine.java:336)
at com/ibm/ws/webservices/engine/transport/http/WebServicesServlet.doPost(WebServicesServlet.java:831)
at javax/servlet/http/HttpServlet.service(HttpServlet.java:763)
at com/ibm/ws/webservices/engine/transport/http/WebServicesServletBase.service(WebServicesServletBase.java:341)
at javax/servlet/http/HttpServlet.service(HttpServlet.java:856)
at com/ibm/ws/webcontainer/servlet/ServletWrapper.service(ServletWrapper.java:1075)
at com/ibm/ws/webcontainer/servlet/ServletWrapper.handleRequest(ServletWrapper.java:550(Compiled Code))
at com/ibm/ws/wswebcontainer/servlet/ServletWrapper.handleRequest(ServletWrapper.java:478(Compiled Code))
at com/ibm/ws/webcontainer/servlet/CacheServletWrapper.handleRequest(CacheServletWrapper.java:90)
at com/ibm/ws/webcontainer/WebContainer.handleRequest(WebContainer.java:744)
at com/ibm/ws/wswebcontainer/WebContainer.handleRequest(WebContainer.java:1455)
at com/ibm/ws/webcontainer/channel/WCChannelLink.ready(WCChannelLink.java:115)
at com/ibm/ws/http/channel/inbound/impl/HttpInboundLink.handleDiscrimination(HttpInboundLink.java:458)
at com/ibm/ws/http/channel/inbound/impl/HttpInboundLink.handleNewInformation(HttpInboundLink.java:387)
at com/ibm/ws/http/channel/inbound/impl/HttpInboundLink.ready(HttpInboundLink.java:267)
at com/ibm/ws/tcp/channel/impl/NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)
at com/ibm/ws/tcp/channel/impl/NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)
at com/ibm/ws/tcp/channel/impl/AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165(Compiled Code))
at com/ibm/io/async/AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217(Compiled Code))
at com/ibm/io/async/AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:143(Compiled Code))
at com/ibm/io/async/AsyncFuture.completed(AsyncFuture.java:136(Compiled Code))
at com/ibm/io/async/ResultHandler.complete(ResultHandler.java:195(Compiled Code))
at com/ibm/io/async/ResultHandler.runEventProcessingLoop(ResultHandler.java:743(Compiled Code))
at com/ibm/io/async/ResultHandler$2.run(ResultHandler.java:873)
at com/ibm/ws/util/ThreadPool$Worker.run(ThreadPool.java:1473(Compiled Code))

At this moment, we could connect to the repository and it has no problems, but in the thread dump that thread was waiting for connection.

What could be happen? The solution had been to restart the application server.

Thank you!

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Comments

FabianLee-EMC

There are other reports of DFC programs hanging at this same point in earlier DFC versions, but has been fixed in 6.5 SP2 P15/6.6P15/6.7P05/6.7SP1/D7 (DFC-9672).

Which DFC version are you running?

Skope87

Hello Fabian,

We're using 6.5SP1 DFC, our documentum environment is in this version.

This thread is attempting to establish a session with repository or is doing some other tasks?

We're planning to upgrade our environment to 6.7, but if there are a bug in 6.5SP1, can we apply a workaround to solve it temporally?

Thanks,

FabianLee-EMC

You will need to upgrade to one of the DFC versions I mentioned earlier.

SShan

We had a similar issue in our environment.If you look at the stacktrace, it is stuck waiting for response from database on running a query.Database could be the culprit. We run stats and histograms and our last execution did not create the right stats.So we reran the stats and it helped us recover. Work with your DBA and see if you can do that.There is nothing we can do in WL for this.Also we are in 6.7 SP1 and we had the same issue.

MAU.MORALES

As mentioned, seems like the application is waiting on an active transaction (apparently hanged). As far as I can remember, no two transactions can run at the same time.

Enabling SQL tracing should give you some insight as to what exactly is your app doing at the time it hangs. From there on you can work with your DBA, get execution plan, generate stats, etc...