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From Todd Burruss <bburr...@real.com>
Subject ConcurrentModificationException
Date Fri, 05 Mar 2010 02:54:48 GMT
i'm seeing a lot of these ... any idea?

2010-03-04 18:53:21,455 ERROR [MEMTABLE-POST-FLUSHER:1] [DebuggableThreadPoolExecutor.java:94]
Error in executor futuretask
java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.RuntimeException:
java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
	at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
	at java.util.concurrent.FutureTask.get(FutureTask.java:83)
	at org.apache.cassandra.concurrent.DebuggableThreadPoolExecutor.afterExecute(DebuggableThreadPoolExecutor.java:86)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:888)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.RuntimeException: java.lang.RuntimeException: java.util.concurrent.ExecutionException:
java.util.ConcurrentModificationException
	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:34)
	at java.util.concurrent.Executors$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)
	... 2 more
Caused by: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
	at org.apache.cassandra.db.commitlog.CommitLog.discardCompletedSegments(CommitLog.java:357)
	at org.apache.cassandra.db.ColumnFamilyStore$2.runMayThrow(ColumnFamilyStore.java:392)
	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
	... 6 more
Caused by: java.util.concurrent.ExecutionException: java.util.ConcurrentModificationException
	at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:222)
	at java.util.concurrent.FutureTask.get(FutureTask.java:83)
	at org.apache.cassandra.db.commitlog.CommitLog.discardCompletedSegments(CommitLog.java:349)
	... 8 more
Caused by: java.util.ConcurrentModificationException
	at java.util.ArrayDeque$DeqIterator.next(ArrayDeque.java:605)
	at org.apache.cassandra.db.commitlog.CommitLog.discardCompletedSegmentsInternal(CommitLog.java:385)
	at org.apache.cassandra.db.commitlog.CommitLog.access$300(CommitLog.java:71)
	at org.apache.cassandra.db.commitlog.CommitLog$6.call(CommitLog.java:343)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at org.apache.cassandra.db.commitlog.CommitLogExecutorService.process(CommitLogExecutorService.java:113)
	at org.apache.cassandra.db.commitlog.CommitLogExecutorService.access$200(CommitLogExecutorService.java:35)
	at org.apache.cassandra.db.commitlog.CommitLogExecutorService$1.runMayThrow(CommitLogExecutorService.java:67)
	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
	... 1 more

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