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Support Article

Hung Thread issue in PRPC deployed in WebSphere App server

SA-16980

Summary



Hung Thread Issue in Websphere Application Server. Sometimes user used to receive Hung Threads issue in any of the JVMs, this could lead to outage in the application if it is not checked and timely actions are performed.

Error Messages



[10/16/15 3:30:31:321 MST] 00000004 ThreadMonitor W   CWWSR0605W: Thread "SoapConnectorThreadPool : 6" (000002e5) has been active for 753764 milliseconds and may be hung.  There is/are 25 thread(s) in total in the server that may be hung.
    at com.pega.pegarules.data.internal.access.CachedAliasImpl.estimateDataSize(CachedAliasImpl.java:201)
    at com.pega.pegarules.data.internal.access.CacheContainerImpl.estimateDataSize(CacheContainerImpl.java:1217)
    at com.pega.pegarules.data.internal.access.CacheContainerImpl.getDataSizeAndStatus(CacheContainerImpl.java:1192)
    at com.pega.pegarules.management.internal.MemoryManagementAPI._RuleCacheEstimateSize(MemoryManagementAPI.java:223)
    at com.pega.pegarules.management.internal.MemoryManagementAPI.MemoryStatus(MemoryManagementAPI.java:330)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:611)
    at com.pega.pegarules.management.internal.MB2EngineAccess.invoke(MB2EngineAccess.java:158)
    at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invoke_privact(EngineImpl.java:361)
    at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.run(EngineImpl.java:346)
    at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:1079)
    at com.pega.pegarules.session.internal.PRSessionProviderImpl.doWithRequestorLocked(PRSessionProviderImpl.java:766)
    at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl._invokeEngine_privact(EngineImpl.java:320)
    at com.pega.pegarules.session.internal.engineinterface.etier.impl.EngineImpl.invokeEngine(EngineImpl.java:263)
    at com.pega.pegarules.session.internal.engineinterface.etier.ejb.EngineBean.invokeEngine(EngineBean.java:221)
    at sun.reflect.GeneratedMethodAccessor127.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
    at java.lang.reflect.Method.invoke(Method.java:611)
    at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethod(PRBootstrap.java:349)
    at com.pega.pegarules.internal.bootstrap.PRBootstrap.invokeMethodPropagatingThrowable(PRBootstrap.java:390)


Steps to Reproduce



N/A

Root Cause



Configuration issue in the application server environment causing too many SoapConnectorThreadPool threads are hung in WebSphere Appliation Server. The SoapConnectorThreadPool is used for administrative messages.


Resolution



Following settings in WebSphere Application server controls max number of threads and can decide whether threads are growable or not after reaching the max number, by default it is true.
 
  1. SOAP_SERVER_THREADS_PROP
Using this constant, you can set the max number of threads in the server, default value is 5.
  1. SOAP_CONNECTOR_THREAD_POOL_GROWABLE

Using this property you can decide whether threads are growable or not after reaching the max number, by default it is true. Due to this threads are growing in the server, which we need to set false.
 

Suggest Edit

Published January 31, 2016 - Updated October 8, 2020

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