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https://issues.apache.org/jira/browse/CASSANDRA-3253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13113655#comment-13113655
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Yang Yang commented on CASSANDRA-3253:
--------------------------------------
looks to be the same of https://issues.apache.org/jira/browse/CASSANDRA-1991
> inherent deadlock situation in commitLog flush?
> -----------------------------------------------
>
> Key: CASSANDRA-3253
> URL: https://issues.apache.org/jira/browse/CASSANDRA-3253
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: 1.0.0
> Reporter: Yang Yang
>
> after my system ran for a while, it consitently goes into frozen state where
> all the mutations stage threads are waiting
> on the switchlock,
> the reason is that the switchlock is held by commit log, as shown by the
> following thread dump:
> "COMMIT-LOG-WRITER" prio=10 tid=0x00000000010df000 nid=0x32d3 waiting on
> condition [0x00007f2d81557000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00007f3579eec060> (a
> java.util.concurrent.FutureTask$Sync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:838)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireSharedInterruptibly(AbstractQueuedSynchronizer.java:998)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireSharedInterruptibly(AbstractQueuedSynchronizer.java:1304)
> at java.util.concurrent.FutureTask$Sync.innerGet(FutureTask.java:248)
> at java.util.concurrent.FutureTask.get(FutureTask.java:111)
> at
> org.apache.cassandra.db.commitlog.CommitLog.getContext(CommitLog.java:386)
> at
> org.apache.cassandra.db.ColumnFamilyStore.maybeSwitchMemtable(ColumnFamilyStore.java:650)
> at
> org.apache.cassandra.db.ColumnFamilyStore.forceFlush(ColumnFamilyStore.java:722)
> at
> org.apache.cassandra.db.commitlog.CommitLog.createNewSegment(CommitLog.java:573)
> at
> org.apache.cassandra.db.commitlog.CommitLog.access$300(CommitLog.java:81)
> at
> org.apache.cassandra.db.commitlog.CommitLog$LogRecordAdder.run(CommitLog.java:596)
> at
> org.apache.cassandra.db.commitlog.PeriodicCommitLogExecutorService$1.runMayThrow(PeriodicCommitLogExecutorService.java:49)
> at
> org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:30)
> at java.lang.Thread.run(Thread.java:679)
> we can clearly see that the COMMIT-LOG-WRITER thread is running the regular
> appender , but the appender itself calls getContext(), which again submits a
> new Callable to be executed, and waits on the Callable. but the new Callable
> is never going to be executed since the executor has only *one* thread.
> I believe this is a deterministic bug.
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