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From Andrew Purtell <apurt...@apache.org>
Subject Re: SessionExpiredException: KeeperErrorCode = Session expired for /hbase
Date Mon, 12 Oct 2009 23:42:59 GMT
If you mean by "localhost" standalone that you are running the master, one region server only,
and a zookeeper quorum peer all on the same server and this is the sum of your HBase install,
and then you are also running jobtracker, tasktracker, map and reducers etc. also on the same
server, then you should expect the kind of the Zookeeper related exceptions you are seeing
are because your system simply becomes too busy to support all of the necessary concurrent
operation. Please read: http://mail-archives.apache.org/mod_mbox/hadoop-hbase-user/200909.mbox/%3C644823.32878.qm@web65515.mail.ac4.yahoo.com%3E

  - Andy




________________________________
From: Something Something <luckyguy2050@yahoo.com>
To: hbase-user@hadoop.apache.org
Sent: Mon, October 12, 2009 11:51:13 PM
Subject: Re: SessionExpiredException: KeeperErrorCode = Session expired for  /hbase

Yes, I am running in "Localhost standalone" mode for now.  I know it sounds weird, but hopefully
we will get funding for additional hardware soon.  

So.. just one HBase master for now :(

--- On Mon, 10/12/09, Andrew Purtell <apurtell@apache.org> wrote:

From: Andrew Purtell <apurtell@apache.org>
Subject: Re: SessionExpiredException: KeeperErrorCode = Session expired for  /hbase
To: hbase-user@hadoop.apache.org
Date: Monday, October 12, 2009, 12:33 AM

Do you really only have "localhost" as the value of hbase.zookeeper.quorum in your hbase-site.xml
config file? Or perhaps no such entry at all? Or maybe hbase-site.xml is not on the classpath
of the task trackers? Are you running an external ZooKeeper ensemble or is HBase managing
it? 

How many HBase masters? Region servers? Task trackers?

    - Andy





________________________________
From: Amandeep Khurana <amansk@gmail.com>
To: hbase-user@hadoop.apache.org
Sent: Mon, October 12, 2009 1:54:27 PM
Subject: Re: SessionExpiredException: KeeperErrorCode = Session expired for  /hbase

This shouldnt be causing your jobs to fail... These are just session expiry
warnings. New nodes will get created in zk and the jobs shouldnt be
interrupted.


On Sun, Oct 11, 2009 at 10:50 PM, Something Something <
luckyguy2050@yahoo.com> wrote:

> Occasionally, I see the following exception in the log.  The severity of
> this is 'WARN', so I am not sure if my MapReduce job is successful.  Can
> this message be ignored?  Sounds 'SEVERE' to me.
>
> Note:  I am running over 15000 jobs sequentially.  This happens
> occasionally after about 8000 jobs are processed, so it's a bit hard to
> debug.
>
> I guess, I could look at the source code, and see what this message means.
> But I am being lazy :)  Thanks in advance for your advice.
>
>
> 09/10/11 22:33:03 WARN zookeeper.ZooKeeperWrapper: Failed to create /hbase
> -- check quorum servers,
> currently=localhost:2181org.apache.zookeeper.KeeperException$SessionExpiredException:
> KeeperErrorCode = Session expired for /hbase        at
>  org.apache.zookeeper.KeeperException.create(KeeperException.java:118)
>    at org.apache.zookeeper.KeeperException.create(KeeperException.java:42)
>      at org.apache.zookeeper.ZooKeeper.create(ZooKeeper.java:522)        at
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureExists(ZooKeeperWrapper.java:342)
>      at
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.ensureParentExists(ZooKeeperWrapper.java:365)
>      at
> org.apache.hadoop.hbase.zookeeper.ZooKeeperWrapper.checkOutOfSafeMode(ZooKeeperWrapper.java:478)
>      at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRootRegion(HConnectionManager.java:903)
>      at
>  org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:573)
>      at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:549)
>      at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:623)
>      at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:582)
>      at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:549)
>      at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegionInMeta(HConnectionManager.java:623)
>      at
>  org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:586)
>      at
> org.apache.hadoop.hbase.client.HConnectionManager$TableServers.locateRegion(HConnectionManager.java:549)
>      at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:125)
>  at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:103)

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