[infinispan-issues] [JBoss JIRA] (ISPN-2970) TopologyAwareConsistentHashFactory.rebalance can fail with an IndexOutOfBoundsException

[Dan Berindei (JIRA)]

Dan Berindei created ISPN-2970:
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             Summary: TopologyAwareConsistentHashFactory.rebalance can fail with an IndexOutOfBoundsException
                 Key: ISPN-2970
                 URL: https://issues.jboss.org/browse/ISPN-2970
             Project: Infinispan
          Issue Type: Bug
          Components: Distributed Cache
    Affects Versions: 5.2.0.Final
            Reporter: Dan Berindei
            Assignee: Dan Berindei
             Fix For: 5.3.0.Alpha1


In rare circumstances, TopologyAwareConsistentHashFactory can fail to allocate numOwners owners to each segment, resulting in an IndexOutOfBoundsException:

{code}
09:41:23,009 ERROR [org.infinispan.topology.ClusterTopologyManagerImpl] (undefined) Failed to start rebalance: Index: 1, Size: 1: java.lang.IndexOutOfBoundsException: Index: 1, Size: 1
	at java.util.ArrayList.RangeCheck(ArrayList.java:547) [rt.jar:1.6.0_43]
	at java.util.ArrayList.get(ArrayList.java:322) [rt.jar:1.6.0_43]
	at org.infinispan.distribution.ch.TopologyAwareConsistentHashFactory.doReplaceBackupOwnersSameMachine(TopologyAwareConsistentHashFactory.java:149) [infinispan-core-5.2.4.Final-redhat-1.jar:5.2.4.Final-redhat-1]
	at org.infinispan.distribution.ch.TopologyAwareConsistentHashFactory.replaceBackupOwnerForMachineLevel(TopologyAwareConsistentHashFactory.java:131) [infinispan-core-5.2.4.Final-redhat-1.jar:5.2.4.Final-redhat-1]
	at org.infinispan.distribution.ch.TopologyAwareConsistentHashFactory.addBackupOwners(TopologyAwareConsistentHashFactory.java:67) [infinispan-core-5.2.4.Final-redhat-1.jar:5.2.4.Final-redhat-1]
	at org.infinispan.distribution.ch.DefaultConsistentHashFactory.rebalanceBuilder(DefaultConsistentHashFactory.java:125) [infinispan-core-5.2.4.Final-redhat-1.jar:5.2.4.Final-redhat-1]
	at org.infinispan.distribution.ch.DefaultConsistentHashFactory.rebalance(DefaultConsistentHashFactory.java:106) [infinispan-core-5.2.4.Final-redhat-1.jar:5.2.4.Final-redhat-1]
	at org.infinispan.distribution.ch.DefaultConsistentHashFactory.rebalance(DefaultConsistentHashFactory.java:45) [infinispan-core-5.2.4.Final-redhat-1.jar:5.2.4.Final-redhat-1]
	at org.infinispan.topology.ClusterTopologyManagerImpl.startRebalance(ClusterTopologyManagerImpl.java:370) [infinispan-core-5.2.4.Final-redhat-1.jar:5.2.4.Final-redhat-1]
	at org.infinispan.topology.ClusterTopologyManagerImpl.access$000(ClusterTopologyManagerImpl.java:66) [infinispan-core-5.2.4.Final-redhat-1.jar:5.2.4.Final-redhat-1]
	at org.infinispan.topology.ClusterTopologyManagerImpl$1.call(ClusterTopologyManagerImpl.java:128) [infinispan-core-5.2.4.Final-redhat-1.jar:5.2.4.Final-redhat-1]
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303) [rt.jar:1.6.0_43]
	at java.util.concurrent.FutureTask.run(FutureTask.java:138) [rt.jar:1.6.0_43]
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895) [rt.jar:1.6.0_43]
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918) [rt.jar:1.6.0_43]
	at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_43]
	at org.jboss.threads.JBossThread.run(JBossThread.java:122) [jboss-threads-2.0.0.GA-redhat-2.jar:2.0.0.GA-redhat-2]
{code}

This can happen only after a node leaves. When it happens, the rebalance is stopped and the some keys will remain with less than numOwners owners. If another node leaves, some keys may be lost. If another node joins, the next rebalance will succeed and the keys will be redistributed properly.

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