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HBase, mail # user - zookeeper.znode.parent mismatch exception


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RE: zookeeper.znode.parent mismatch exception
Sandeep L 2013-12-13, 08:12
I checked zk dump from master UI, there all 5 zk servers are appearing with some stats.
Not always we are getting this exception, only in random intervals we are seeing it.

Thanks,Sandeep.

> From: [EMAIL PROTECTED]
> Date: Fri, 13 Dec 2013 13:10:52 +0530
> Subject: Re: zookeeper.znode.parent mismatch exception
> To: [EMAIL PROTECTED]
>
> Can you check if your ZK servers are actually forming a quorum or if they
> are just stand alone instances? If they don't form a quorum, znodes are
> just created on which ever zk server the master first connects to and the
> apps/RS connecting to other instances don't see the znode and thus raising
> this error.
>
>
> On Fri, Dec 13, 2013 at 1:03 PM, Sandeep L <[EMAIL PROTECTED]>wrote:
>
> > No, we didn't upgraded. We are using HBase-0.94.1
> > The issue here is we are not always facing this issue, only once in a
> > while we are facing this issue(2 or 3 times a day).Other times it working
> > without any issue.
> >
> > Thanks,Sandeep.
> >
> > > Date: Thu, 12 Dec 2013 23:23:18 -0800
> > > Subject: Re: zookeeper.znode.parent mismatch exception
> > > From: [EMAIL PROTECTED]
> > > To: [EMAIL PROTECTED]
> > >
> > > Did you recently upgrade to 0.96? This is a problem I faced with
> > mismatched
> > > clients connecting to an 0.96 cluster. Starting in that version, the root
> > > node for zookeeper chanced from /hbase to /hbase-unsecure (if in unsecure
> > > mode).
> > >
> > >
> > > On Thu, Dec 12, 2013 at 10:47 PM, Sandeep L <[EMAIL PROTECTED]
> > >wrote:
> > >
> > > > Hi,
> > > > Our production cluster is in distributed mode with 5 servers as
> > zookeeper
> > > > quorum.
> > > > While accessing production HBase server from our application we are
> > > > getting zookeeper.znode.parent mismatch exception.
> > > > Following is exception in our log files:
> > > > from org.apache.hadoop.hbase.zookeeper.ZooKeeperNodeTracker in
> > > > pool-67467-thread-1Check the value configured in
> > 'zookeeper.znode.parent'.
> > > > There could be a mismatch with the one configured in the master.
> > > >
> > > > We checked all hbase-site.xml files to find any mismatches in
> > > > configurations, but no luck all configuration files same. We don't
> > have any
> > > > configuration with name zookeeper.znode.parent in hbase-site.xml, but I
> > > > have one configuration with same name in hbase-defalut.xml with value
> > as
> > > > /hbase.
> > > > In our application server we don't have any file with name
> > > > hbase-default.xml, but we have hbase-site.xml in it.
> > > >
> > > > Can someone help us to resolve this issue.
> > > >
> > > > Thanks,Sandeep.
> >
> >
>
>
>
> --
> Bharath Vissapragada
> <http://www.cloudera.com>