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https://issues.apache.org/jira/browse/CASSANDRA-13235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16143203#comment-16143203
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Jeff Jirsa commented on CASSANDRA-13235:
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[~zhaoyan] do you still see this after CASSANDRA-12689 ?
> All thread blocked and writes pending.
> --------------------------------------
>
> Key: CASSANDRA-13235
> URL: https://issues.apache.org/jira/browse/CASSANDRA-13235
> Project: Cassandra
> Issue Type: Bug
> Components: Core
> Environment: jdk8
> cassandra 2.1.15
> Reporter: zhaoyan
>
> I found cassandra many pending MutationStage task
> {code}
> NFO [Service Thread] 2017-02-17 16:00:14,440 StatusLogger.java:51 - Pool
> Name Active Pending Completed Blocked All Time
> Blocked
> INFO [Service Thread] 2017-02-17 16:00:14,440 StatusLogger.java:66 -
> MutationStage 384 4553 4294213082 0
> 0
> INFO [Service Thread] 2017-02-17 16:00:14,441 StatusLogger.java:66 -
> RequestResponseStage 0 0 2172612382 0
> 0
> INFO [Service Thread] 2017-02-17 16:00:14,441 StatusLogger.java:66 -
> ReadRepairStage 0 0 5378852 0
> 0
> INFO [Service Thread] 2017-02-17 16:00:14,441 StatusLogger.java:66 -
> CounterMutationStage 0 0 0 0
> 0
> INFO [Service Thread] 2017-02-17 16:00:14,441 StatusLogger.java:66 -
> ReadStage 5 0 577242284 0
> 0
> INFO [Service Thread] 2017-02-17 16:00:14,441 StatusLogger.java:66 -
> MiscStage 0 0 0 0
> 0
> INFO [Service Thread] 2017-02-17 16:00:14,441 StatusLogger.java:66 -
> HintedHandoff 0 0 1480 0
> 0
> INFO [Service Thread] 2017-02-17 16:00:14,441 StatusLogger.java:66 -
> GossipStage 0 0 9342250 0
> 0
> {code}
> And I found there are many blocked thread with jstack
> {code}
> "SharedPool-Worker-28" #416 daemon prio=5 os_prio=0 tid=0x0000000001fb8000
> nid=0x7459 waiting for monitor entry [0x00007fdd83ca0000]
> java.lang.Thread.State: BLOCKED (on object monitor)
> at sun.misc.Unsafe.monitorEnter(Native Method)
> at
> org.apache.cassandra.utils.concurrent.Locks.monitorEnterUnsafe(Locks.java:46)
> at
> org.apache.cassandra.db.AtomicBTreeColumns.addAllWithSizeDelta(AtomicBTreeColumns.java:202)
> at org.apache.cassandra.db.Memtable.put(Memtable.java:210)
> at
> org.apache.cassandra.db.ColumnFamilyStore.apply(ColumnFamilyStore.java:1244)
> at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:396)
> at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:359)
> at org.apache.cassandra.db.Mutation.apply(Mutation.java:214)
> at
> org.apache.cassandra.db.MutationVerbHandler.doVerb(MutationVerbHandler.java:54)
> at
> org.apache.cassandra.net.MessageDeliveryTask.run(MessageDeliveryTask.java:64)
> at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
> at
> org.apache.cassandra.concurrent.AbstractTracingAwareExecutorService$FutureTask.run(AbstractTracingAwareExecutorService.java:164)
> at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:105)
> at java.lang.Thread.run(Thread.java:745)
> {code}
> To use "grep BLOCKED |wc -l", get Number is 384
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