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From "Ramkrishna.S.Vasudevan" <ramkrishna.vasude...@huawei.com>
Subject RE: HBaseAdmin needs a close methord
Date Thu, 19 Apr 2012 05:27:47 GMT
Hi Lee

Is HBASE-5073 resolved in that release?

Regards
Ram

> -----Original Message-----
> From: Eason Lee [mailto:softse.com@gmail.com]
> Sent: Thursday, April 19, 2012 10:40 AM
> To: user@hbase.apache.org
> Subject: Re: HBaseAdmin needs a close methord
> 
> I am using cloudera's cdh3u3
> > Hi Lee
> >
> > Which version of HBase are you using?
> >
> > Regards
> > Ram
> >
> >> -----Original Message-----
> >> From: Eason Lee [mailto:softse.com@gmail.com]
> >> Sent: Thursday, April 19, 2012 9:36 AM
> >> To: user@hbase.apache.org
> >> Subject: HBaseAdmin needs a close methord
> >>
> >> Resently, my app meets a problem list as follows
> >>
> >> Can't construct instance of class
> >> org/apache/hadoop/hbase/client/HBaseAdmin
> >> Exception in thread "Thread-2" java.lang.OutOfMemoryError: unable to
> >> create new native thread
> >> at java.lang.Thread.start0(Native Method)
> >> at java.lang.Thread.start(Thread.java:640)
> >> at org.apache.zookeeper.ClientCnxn.start(ClientCnxn.java:414)
> >> at org.apache.zookeeper.ZooKeeper.<init>(ZooKeeper.java:378)
> >> at org.apache.hadoop.hbase.zookeeper.ZKUtil.connect(ZKUtil.java:97)
> >> at
> >>
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWatcher.<init>(ZooKeeperWatc
> >> her.java:119)
> >> at
> >>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementa
> >> tion.getZooKeeperWatcher(HConnectionManager.java:1002)
> >> at
> >>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementa
> >> tion.setupZookeeperTrackers(HConnectionManager.java:304)
> >> at
> >>
> org.apache.hadoop.hbase.client.HConnectionManager$HConnectionImplementa
> >> tion.<init>(HConnectionManager.java:295)
> >> at
> >>
> org.apache.hadoop.hbase.client.HConnectionManager.getConnection(HConnec
> >> tionManager.java:157)
> >> at
> org.apache.hadoop.hbase.client.HBaseAdmin.<init>(HBaseAdmin.java:90)
> >> Call to org.apache.hadoop.hbase.HBaseAdmin::HBaseAdmin failed!
> >>
> >> My app create HBaseAdmin every 30s,and the threads used by my app
> >> increases about 1thread/30s.See from the stack, there is only one
> >> HBaseAdmin in Memory, but lots of Configuration and
> >> HConnectionImplementation instances.
> >>
> >> I can see from the sources, everytime when HBaseAdmin is created, a
> new
> >> Configuration and HConnectionImplementation is created and added to
> >> HConnectionManager.HBASE_INSTANCES.So they are not collected by gc
> when
> >> HBaseAdmin is collected.
> >>
> >> So i think we need to add a close methord to remove the
> >> Configuration&HConnectionImplementation from
> >> HConnectionManager.HBASE_INSTANCES.Just as follows:
> >>
> >> public void close(){
> >> 	HConnectionManager.deleteConnection(getConfiguration(), true);
> >> }
> >
> >
> >



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