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 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 Is this a situation where I need to perform some other maintenance task before running a repair? Thanks for your help, Scott Fines
