[CASSANDRA-853] ConcurrentModificationException

• Type: Bug
• Status: Resolved
• Priority: Normal
• Resolution: Fixed
• Fix Version/s: 0.6
• Severity: Normal
• Assignee: gabriele renzi
• Reporter: B. Todd Burruss

Authors

gabriele renzi

• Created: 05/Mar/10 17:11
• Updated: 16/Apr/19 09:33
• Resolved: 05/Mar/10 20:12

Description

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