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From Jonathan Ellis <jbel...@gmail.com>
Subject Re: thread blocked from jconsle
Date Fri, 10 Jun 2011 03:28:39 GMT
That says "I'm idle waiting for a read to process."

2011/6/9 Donna Li <donna.li@utstar.com>:
>
>
> Hello everyone:
>
>       From the jconsole, I find many thread is blocked, but cassandra server
> is normal, the result of nodetool cfstats and nodetool tpstats are as
> following, is the cassandra server normal, should I care about the thread
> block info of jconsle?
>
>
>
> A block thread of jconsle:
>
> name: ROW-READ-STAGE:5
>
> status:WAITING on
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1fc5a2
>
> total blocked:143  wait: 6,891
>
>
>
> stack :
>
> sun.misc.Unsafe.park(Native Method)
>
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1978)
>
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:386)
>
> java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1043)
>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1103)
>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
>
> java.lang.Thread.run(Thread.java:636)
>
>
>
>
>
> cfstats
>
> Keyspace: PSCluster
>
>         Read Count: 88425
>
>         Read Latency: 1.4044925756290643 ms.
>
>         Write Count: 702416
>
>         Write Latency: 0.03599318210291337 ms.
>
>         Pending Tasks: 0
>
>
>
> tpstats
>
> Pool Name                    Active   Pending      Completed
>
> STREAM-STAGE                      0         0              0
>
> RESPONSE-STAGE                    0         0          44600
>
> ROW-READ-STAGE                    0         0          55177
>
> LB-OPERATIONS                     0         0              0
>
> MESSAGE-DESERIALIZER-POOL         0         0              0
>
> GMFD                              0         0              0
>
> LB-TARGET                         0         0              0
>
> CONSISTENCY-MANAGER               0         0              0
>
> ROW-MUTATION-STAGE                0         0         942262
>
> MESSAGE-STREAMING-POOL            0         0              0
>
> LOAD-BALANCER-STAGE               0         0              0
>
> FLUSH-SORTER-POOL                 0         0              0
>
> MEMTABLE-POST-FLUSHER             0         0            144
>
> FLUSH-WRITER-POOL                 0         0            144
>
> AE-SERVICE-STAGE                  0         0              0
>
>
>
> Best Regards
>
> Donna li
>
>



-- 
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com

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