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From "Donna Li" <donna...@utstar.com>
Subject thread blocked from jconsle
Date Fri, 10 Jun 2011 03:08:58 GMT
 

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

 


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