Mailing-List: contact user-help@cassandra.apache.org; run by ezmlm
Precedence: bulk
Reply-To: user@cassandra.apache.org
Received-SPF: pass (athena.apache.org: domain of jbellis@gmail.com designates
 74.125.82.44 as permitted sender)
DomainKey-Signature: a=rsa-sha1; c=nofws;
        d=gmail.com; s=gamma;
        h=mime-version:in-reply-to:references:from:date:message-id:subject:to
         :content-type:content-transfer-encoding;
        b=De/dvOKSgilAOqV7BUfAA6iS3ETgu3Vfep1mAbceTN1BUyfLdM4cMV4im/w+W9FHSu
         EojHoATKHcOlxsq0kicG+isz8Y5wR7nT1PBv2Z5zKzv5Y1/ypM0LdHkfDQ5tlSj9PVbH
         5j+NOCSysZ8HNkoRqAdnhQLFg3Tx4TzgZxn+4=
MIME-Version: 1.0
In-Reply-To: 
 <7DA4B654C7FEB24C9998EE4867BEE93EB9EB70@CNMAIL12.cn.utstarcom.com>
References: <7DA4B654C7FEB24C9998EE4867BEE93EB9EB70@CNMAIL12.cn.utstarcom.com>
From: Jonathan Ellis <jbellis@gmail.com>
Date: Thu, 9 Jun 2011 22:28:39 -0500
Message-ID: <BANLkTimHocz5SWsdxi9Td9+FFYtKZdon7g@mail.gmail.com>
Subject: Re: thread blocked from jconsle
To: user@cassandra.apache.org
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

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 ser=
ver
> 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=EF=BC=9A ROW-READ-STAGE:5
>
> status=EF=BC=9AWAITING on
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject@1fc=
5a2
>
> total blocked=EF=BC=9A143  wait=EF=BC=9A 6,891
>
>
>
> stack =EF=BC=9A
>
> sun.misc.Unsafe.park(Native Method)
>
> java.util.concurrent.locks.LockSupport.park(LockSupport.java:186)
>
> java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awa=
it(AbstractQueuedSynchronizer.java:1978)
>
> java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:38=
6)
>
> java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1=
043)
>
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java=
:1103)
>
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.jav=
a: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
>
>


--=20
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com