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From Vladimir Rodionov <vrodio...@carrieriq.com>
Subject RE: Hbase memory leak error message when stopping tomcat
Date Wed, 09 Jul 2014 06:32:08 GMT
HBase client spawns multiple threads inside Java application server (Tomcat). Tomcat does not
like it.
No memory leaks - just warnings.

Best regards,
Vladimir Rodionov
Principal Platform Engineer
Carrier IQ, www.carrieriq.com
e-mail: vrodionov@carrieriq.com

________________________________________
From: krish_571 [krish_571@yahoo.com]
Sent: Monday, July 07, 2014 11:34 AM
To: user@hbase.apache.org
Subject: Hbase memory leak error message when stopping tomcat

We have a java application (on tomcat) that connects to Hbase. We are getting
the below errors when we stop tomcat. Any thoughts?


SEVERE: The web application [/testapp] appears to have started a thread
named [hbase-tablepool-168-thread-1] but has failed to stop it. This is very
likely to create a memory leak.

Jul 07, 2014 2:51:38 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/testapp] appears to
have started a thread named [hbase-tablepool-169-thread-1] but has failed to
stop it. This is very likely to create a memory leak.

Jul 07, 2014 2:51:38 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/testapp] appears to
have started a thread named [IPC Client (47) connection to
ip-XX-XX-XX-XX.ec2.internal/XX-XX-XX-XX:60020 from tomcat] but has failed to
stop it. This is very likely to create a memory leak.

Jul 07, 2014 2:51:38 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/testapp] appears to
have started a thread named [IPC Client (47) connection to
ip-XX-XX-XX-XX.ec2.internal/XX-XX-XX-XX:60020 from tomcat] but has failed to
stop it. This is very likely to create a memory leak.

Jul 07, 2014 2:51:38 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/testapp] appears to
have started a thread named [IPC Client (47) connection to
ip-XX-XX-XX-XX.ec2.internal/XX-XX-XX-XX:60020 from tomcat] but has failed to
stop it. This is very likely to create a memory leak.

Jul 07, 2014 2:51:38 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/testapp] appears to
have started a thread named [IPC Client (47) connection to
ip-XX-XX-XX-XX.ec2.internal/XX-XX-XX-XX:60020 from tomcat] but has failed to
stop it. This is very likely to create a memory leak.

Jul 07, 2014 2:51:38 PM org.apache.catalina.loader.WebappClassLoader
clearReferencesThreads SEVERE: The web application [/testapp] appears to
have started a thread named [hbase-tablepool-170-thread-1] but has failed to
stop it. This is very likely to create a memory leak.

Jul 07, 2014 2:51:38 PM org.apache.catalina.loader.WebappClassLoader
checkThreadLocalMapForLeaks SEVERE: The web application [/testapp] created a
ThreadLocal with key of type [org.apache.hadoop.io.Text$1] (value
[org.apache.hadoop.io.Text$1@1dba6717]) and a value of type
[sun.nio.cs.UTF_8.Encoder] (value [sun.nio.cs.UTF_8$Encoder@38c62640]) but
failed to remove it when the web application was stopped. This is very
likely to create a memory leak.

Jul 07, 2014 2:51:38 PM org.apache.catalina.loader.WebappClassLoader
checkThreadLocalMapForLeaks

SEVERE: The web application [/testapp] created a ThreadLocal with key of
type [org.apache.hadoop.io.Text$1] (value
[org.apache.hadoop.io.Text$1@1dba6717]) and a value of type
[sun.nio.cs.UTF_8.Encoder] (value [sun.nio.cs.UTF_8$Encoder@58f950de]) but
failed to remove it when the web application was stopped. This is very
likely to create a memory leak.

Jul 07, 2014 2:51:39 PM org.apache.coyote.http11.Http11Protocol destroy
INFO: Stopping Coyote HTTP/1.1 on http-8080



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