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From: Ted Yu <yuzhihong@gmail.com>
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Subject: Re: Threads leaking from Apache tomcat application
Message-Id: <DA5848E6-2C17-40C6-ABC2-534A62905988@gmail.com>
Date: Mon, 5 Jan 2015 05:20:47 -0800
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To: "user@hbase.apache.org" <user@hbase.apache.org>

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There're several non-English phrases which seem to be links.=20
But when I clicked on them, there was no response.=20

Can you give the links in URL ?

Cheers


> On Jan 5, 2015, at 2:39 AM, Serega Sheypak <serega.sheypak@gmail.com> wrot=
e:
>=20
> Hi, I'm still trying to deal with apache tomcat web-app and hbase HBase 0.=
98.6=20
> The root problem is that user threads constantly grows. I do get thousands=
 of live threads on tomcat instance. Then it dies of course.=20
>=20
> please see visualVM threads count dynamics
>=20
>=20
> Please see selected thread. It should be related to zookeeper (because of t=
hread-name suffix SendThread)
>=20
>=20
>=20
> The threaddump for this thread is:
>=20
> "visit-thread-27799752116280271-EventThread" - Thread t@75
>    java.lang.Thread.State: WAITING
> 	at sun.misc.Unsafe.park(Native Method)
> 	- parking to wait for <34671cea> (a java.util.concurrent.locks.Abst=
ractQueuedSynchronizer$ConditionObject)
> 	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:186=
)
> 	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionO=
bject.await(AbstractQueuedSynchronizer.java:2043)
> 	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueu=
e.java:442)
> 	at org.apache.zookeeper.ClientCnxn$EventThread.run(ClientCnxn.java:=
494)
>=20
>    Locked ownable synchronizers:
> 	- None
>=20
> Why does it live "forever"? I next 24 hours I would get ~1200 live theads.=

>=20
> "visit thread" does simple put/get by key, newrelic says it takes 30-40 ms=
 to respond.
> I just set a name for the thread inside servlet method.
>=20
> Here is CPU profiling result:
>=20
>=20
> Here are some Zookeeper metrics.
>=20
>=20

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