Confluence Index Hangs or Runs Slowly with 'java.util.ConcurrentModificationException'
Symptoms
A reindex hangs or runs very slowly with the following errors in the logs:
Exception in thread "Indexer: 2" java.util.ConcurrentModificationException
at java.util.LinkedList$ListItr.checkForComodification(LinkedList.java:761)
at java.util.LinkedList$ListItr.next(LinkedList.java:696)
at com.atlassian.confluence.search.lucene.ObjectQueue.retrieveObjectsIndividuallyAndLogFailures(ObjectQueue.java:81)
at com.atlassian.confluence.search.lucene.ObjectQueue.pop(ObjectQueue.java:74)
at com.atlassian.confluence.search.lucene.DefaultObjectQueueWorker$1.doInTransactionWithoutResult(DefaultObjectQueueWorker.java:58)
at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:127)
at com.atlassian.confluence.search.lucene.DefaultObjectQueueWorker.run(DefaultObjectQueueWorker.java:51)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:619)
Taking several thread dumps. If this issue is occuring, a thread will look like:
sun.misc.Unsafe.park(Native Method)
java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:198)
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitNanos(AbstractQueuedSynchronizer.java:1963)
java.util.concurrent.ThreadPoolExecutor.awaitTermination(ThreadPoolExecutor.java:1245)
com.atlassian.confluence.search.lucene.MultiThreadedIndexRebuilder.indexEntities(MultiThreadedIndexRebuilder.java:97)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:304)
org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
$Proxy74.indexEntities(Unknown Source)
com.atlassian.confluence.search.IndexingTask.runInternal(IndexingTask.java:33)
com.atlassian.confluence.util.longrunning.ConfluenceAbstractLongRunningTask.run(ConfluenceAbstractLongRunningTask.java:21)
java.lang.Thread.run(Thread.java:619)Cause
This is caused by a known issue reported at CONF-20301 - Getting issue details... STATUS .
Resolution
There is a patch attached to CONF-20301 - Getting issue details... STATUS . Please follow the instructions in the bug report to apply the patch.
Last modified on Apr 15, 2016
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