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From Scott Fines <>
Subject ConcurrentModificationException during nodetool repair
Date Mon, 24 Oct 2011 16:23:46 GMT
Hello all,

Right now, I have 10 machines running Cassandra 0.8.7, and mostly they are working fine. However,
during a nodetool repair of one machine, I'm seeing:

ERROR [AntiEntropySessions:12] 2011-10-24 11:17:52,154 (line
139) Fatal exception in thread Thread[AntiEntropySessions:12,5,RMI Runtime]
java.lang.RuntimeException: java.util.ConcurrentModificationException
at java.util.concurrent.Executors$
at java.util.concurrent.FutureTask$Sync.innerRun(
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(
at java.util.concurrent.ThreadPoolExecutor$
Caused by: java.util.ConcurrentModificationException
at java.util.HashMap$HashIterator.nextEntry(
at java.util.HashMap$
at org.apache.cassandra.service.AntiEntropyService$RepairSession$RepairJob.sendTreeRequests(
at org.apache.cassandra.service.AntiEntropyService$RepairSession.runMayThrow(
... 6 more

Is this a situation where I need to perform some other maintenance task before running a repair?

Thanks for your help,

Scott Fines

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