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Date: Mon, 17 Oct 2016 06:05:58 +0000 (UTC)
From: "Benjamin Roth (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
Message-ID: <JIRA.13006891.1474563541000.1299.1476684358539@Atlassian.JIRA>
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Subject: [jira] [Commented] (CASSANDRA-12689) All MutationStage threads
 blocked, kills server
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archived-at: Mon, 17 Oct 2016 06:06:05 -0000


    [ https://issues.apache.org/jira/browse/CASSANDRA-12689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15581333#comment-15581333 ] 

Benjamin Roth commented on CASSANDRA-12689:
-------------------------------------------

[~thobbs] Is there a reason why you didn't merge my patch yet?

> All MutationStage threads blocked, kills server
> -----------------------------------------------
>
>                 Key: CASSANDRA-12689
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12689
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Local Write-Read Paths
>            Reporter: Benjamin Roth
>            Assignee: Benjamin Roth
>            Priority: Critical
>             Fix For: 3.0.x, 3.x
>
>
> Under heavy load (e.g. due to repair during normal operations), a lot of NullPointerExceptions occur in MutationStage. Unfortunately, the log is not very chatty, trace is missing:
> {noformat}
> 2016-09-22T06:29:47+00:00 cas6 [MutationStage-1] org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService Uncaught exception on thread Thread[MutationStage-1,5,main]: {}
> 2016-09-22T06:29:47+00:00 cas6 #011java.lang.NullPointerException: null
> {noformat}
> Then, after some time, in most cases ALL threads in MutationStage pools are completely blocked. This leads to piling up pending tasks until server runs OOM and is completely unresponsive due to GC. Threads will NEVER unblock until server restart. Even if load goes completely down, all hints are paused, and no compaction or repair is running. Only restart helps.
> I can understand that pending tasks in MutationStage may pile up under heavy load, but tasks should be processed and dequeud after load goes down. This is definitively not the case. This looks more like a an unhandled exception leading to a stuck lock.
> Stack trace from jconsole, all Threads in MutationStage show same trace.
> {noformat}
> Name: MutationStage-48
> State: WAITING on java.util.concurrent.CompletableFuture$Signaller@fcc8266
> Total blocked: 137  Total waited: 138.513
> {noformat}
> Stack trace: 
> {noformat}
> sun.misc.Unsafe.park(Native Method)
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
> java.util.concurrent.CompletableFuture$Signaller.block(CompletableFuture.java:1693)
> java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3323)
> java.util.concurrent.CompletableFuture.waitingGet(CompletableFuture.java:1729)
> java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895)
> com.google.common.util.concurrent.Uninterruptibles.getUninterruptibly(Uninterruptibles.java:137)
> org.apache.cassandra.db.Mutation.apply(Mutation.java:227)
> org.apache.cassandra.db.Mutation.apply(Mutation.java:241)
> org.apache.cassandra.hints.Hint.apply(Hint.java:96)
> org.apache.cassandra.hints.HintVerbHandler.doVerb(HintVerbHandler.java:91)
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:66)
> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$FutureTask.run(AbstractLocalAwareExecutorService.java:162)
> org.apache.cassandra.concurrent.AbstractLocalAwareExecutorService$LocalSessionFutureTask.run(AbstractLocalAwareExecutorService.java:134)
> org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:109)
> java.lang.Thread.run(Thread.java:745)
> {noformat}


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