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https://issues.apache.org/jira/browse/CASSANDRA-3400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Sylvain Lebresne updated CASSANDRA-3400:
----------------------------------------
Attachment: 3400.patch
There is a race between when we send requests and when start handling their
result, i.e if a response comes before all the requests have been sent. It's
fairly unlikely to happen imho but given than one request is local, if there is
no and barely any data to build the merkle tree from, I suppose it's possible
the local response comes quickly enough.
Patch attached to resolve the issue.
> ConcurrentModificationException during nodetool repair
> ------------------------------------------------------
>
> Key: CASSANDRA-3400
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3400
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Affects Versions: 0.8.7
> Environment: Suse Enterprise linux 11.4
> Reporter: Scott Fines
> Assignee: Sylvain Lebresne
> Priority: Minor
> Attachments: 3400.patch
>
>
> When running a nodetool repair, the following exception can be thrown:
> ERROR [AntiEntropySessions:12] 2011-10-24 11:17:52,154
> AbstractCassandraDaemon.java (line 139) Fatal exception in thread
> Thread[AntiEntropySessions:12,5,RMI Runtime]
> java.lang.RuntimeException: java.util.ConcurrentModificationException
> at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:34)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
> at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
> at java.util.concurrent.FutureTask.run(FutureTask.java:138)
> 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)
> Caused by: java.util.ConcurrentModificationException
> at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
> at java.util.HashMap$KeyIterator.next(HashMap.java:828)
> at
> org.apache.cassandra.service.AntiEntropyService$RepairSession$RepairJob.sendTreeRequests(AntiEntropyService.java:784)
> at
> org.apache.cassandra.service.AntiEntropyService$RepairSession.runMayThrow(AntiEntropyService.java:680)
> at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
> ... 6 more
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