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https://issues.apache.org/jira/browse/CASSANDRA-9279?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Benedict resolved CASSANDRA-9279.
---------------------------------
Resolution: Duplicate
> Gossip (and mutations) lock up on startup
> -----------------------------------------
>
> Key: CASSANDRA-9279
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9279
> Project: Cassandra
> Issue Type: Bug
> Reporter: Sebastian Estevez
> Assignee: Paulo Motta
> Fix For: 2.1.x
>
> Attachments: Screen Shot 2015-04-30 at 4.41.57 PM.png
>
>
> Cluster running 2.0.14.352 on EC2 - c3.4xl's
> 2 nodes out of 8 exhibited the following behavior
> When starting up the node we noticed it was gray in OpsCenter. Other
> monitoring tool showed it as up.
> Turned out gossip tasks were piling up and we could see the following in the
> system.log:
> {code}
> WARN [GossipTasks:1] 2015-04-30 20:22:29,512 Gossiper.java (line 671) Gossip
> stage has 4270 pending tasks; skipping status check (no nodes will be marked
> down)
> WARN [GossipTasks:1] 2015-04-30 20:22:30,612 Gossiper.java (line 671) Gossip
> stage has 4272 pending tasks; skipping status check (no nodes will be marked
> down)
> WARN [GossipTasks:1] 2015-04-30 20:22:31,713 Gossiper.java (line 671) Gossip
> stage has 4273 pending tasks; skipping status check (no nodes will be marked
> down)
> ...
> {code}
> and tpstats shows blocked tasks--gossip and mutations:
> {code}
> GossipStage 1 3904 29384 0
> 0
> {code}
> the CPU's are inactive (See attachment)
> and dstat output:
> {code}
> You did not select any stats, using -cdngy by default.
> ----total-cpu-usage---- -dsk/total- -net/total- ---paging-- ---system--
> usr sys idl wai hiq siq| read writ| recv send| in out | int csw
> 2 0 97 0 0 0|1324k 1381k| 0 0 | 0 0 |6252 5548
> 0 0 100 0 0 0| 0 64k| 42k 1017k| 0 0 |3075 2537
> 0 0 99 0 0 0| 0 8192B| 39k 794k| 0 0 |6999 7039
> 0 0 100 0 0 0| 0 0 | 39k 759k| 0 0 |3067 2726
> 0 0 99 0 0 0| 0 184k| 48k 1086k| 0 0 |4829 4178
> 0 0 99 0 0 0| 0 8192B| 34k 802k| 0 0 |1671 1240
> 0 0 100 0 0 0| 0 8192B| 48k 1067k| 0 0 |1878 1193
> {code}
> I managed to grab a thread dump:
> https://gist.githubusercontent.com/anonymous/3b7b4698c32032603493/raw/read.md
> and dmesg:
> https://gist.githubusercontent.com/anonymous/5982b15337c9afbd5d49/raw/f3c2e4411b9d59e90f4615d93c7c1ad25922e170/read.md
> Restarting the node solved the issue (it came up normally), we don't know
> what is causing it but apparently (per the thread dump) gossip threads are
> blocked writing the system keyspace and the writes waiting on the commitlog.
> Gossip:
> {code}
> "GossipStage:1" daemon prio=10 tid=0x00007ffa23471800 nid=0xa13fa waiting on
> condition [0x00007ff9cbe26000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000005d3f50960> (a
> java.util.concurrent.locks.ReentrantReadWriteLock$NonfairSync)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:834)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.doAcquireShared(AbstractQueuedSynchronizer.java:964)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer.acquireShared(AbstractQueuedSynchronizer.java:1282)
> at
> java.util.concurrent.locks.ReentrantReadWriteLock$ReadLock.lock(ReentrantReadWriteLock.java:731)
> at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:351)
> at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:336)
> at org.apache.cassandra.db.RowMutation.apply(RowMutation.java:211)
> at
> org.apache.cassandra.cql3.statements.ModificationStatement.executeInternal(ModificationStatement.java:709)
> at
> org.apache.cassandra.cql3.QueryProcessor.processInternal(QueryProcessor.java:208)
> at
> org.apache.cassandra.db.SystemKeyspace.updatePeerInfo(SystemKeyspace.java:379)
> - locked <0x00000005d3f41ed8> (a java.lang.Class for
> org.apache.cassandra.db.SystemKeyspace)
> at
> org.apache.cassandra.service.StorageService.updatePeerInfo(StorageService.java:1414)
> at
> org.apache.cassandra.service.StorageService.handleStateNormal(StorageService.java:1524)
> at
> org.apache.cassandra.service.StorageService.onChange(StorageService.java:1350)
> at
> org.apache.cassandra.gms.Gossiper.doOnChangeNotifications(Gossiper.java:1083)
> at org.apache.cassandra.gms.Gossiper.applyNewStates(Gossiper.java:1065)
> at
> org.apache.cassandra.gms.Gossiper.applyStateLocally(Gossiper.java:1023)
> at
> org.apache.cassandra.gms.GossipDigestAckVerbHandler.doVerb(GossipDigestAckVerbHandler.java:58)
> at
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:744)
> Locked ownable synchronizers:
> - <0x0000000609517438> (a
> java.util.concurrent.ThreadPoolExecutor$Worker)
> ...
> {code}
> Mutation:
> {code}
> "MutationStage:32" daemon prio=10 tid=0x00007ffa2339c800 nid=0xa1399 waiting
> on condition [0x00007ff9cd6c8000]
> java.lang.Thread.State: WAITING (parking)
> at sun.misc.Unsafe.park(Native Method)
> - parking to wait for <0x00000005d486a888> (a
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
> at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
> at
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2043)
> at
> java.util.concurrent.LinkedBlockingQueue.put(LinkedBlockingQueue.java:349)
> at
> org.apache.cassandra.db.commitlog.PeriodicCommitLogExecutorService.add(PeriodicCommitLogExecutorService.java:106)
> at org.apache.cassandra.db.commitlog.CommitLog.add(CommitLog.java:206)
> at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:357)
> at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:336)
> at org.apache.cassandra.db.RowMutation.apply(RowMutation.java:211)
> at
> org.apache.cassandra.db.RowMutationVerbHandler.doVerb(RowMutationVerbHandler.java:56)
> at
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:62)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> at java.lang.Thread.run(Thread.java:744)
> {code}
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