In order to delete a znode you have to go to the ZK shell and issue the
"delete" command along with the required path. For example :
delete /hbase/SESSIONID_TIMELINE. For detailed info you can visit the ZK
homepage at : zookeeper.apache.org
Actually when we try to fetch data from an Hbase table, the client or app
first contacts the ZK to get the location of server holding the
-ROOT- table. From this we come to know about the server hosting the .META.
table. This tells us the location of the server which actually holds the
rows of interest. Because of some reasons the znode which was holding this
info has either faced some catastrophe or lost the info associated with
this particular table. Or sometimes the znode remains unable to keep itself
updated with the latest changes. That could also be a probable reason. We
should always keep in mind that ZK is the centralized service that actually
coordinating everything behind the scene. As a result, any problem to the
ZK quorum means problem with Hbase custer.
Regards,
Mohammad Tariq
On Thu, Sep 27, 2012 at 3:39 AM, Mohit Anchlia <mohitanch...@gmail.com>wrote:
> Thanks! I do see Inconsistency. How do I remove the znode. And also could
> you please help me understand how this might have happened?
>
>
> ERROR: Region
> SESSIONID_TIMELINE,,1348689726526.0e200aace5e81cead8d8714ed8076050. not
> deployed on any region server.
>
>
> On Wed, Sep 26, 2012 at 2:36 PM, Mohammad Tariq <donta...@gmail.com>
> wrote:
>
> > A possible reason could be that the znode associated with this particular
> > table is not behaving properly. In such case, you can try the following:
> >
> > Stop Hbase
> > Stop ZK
> > Take a backup of ZK data
> > Restart ZK
> > Remove the znode
> > Start Hbase again
> >
> > After this hopefully your table would be enabled.
> >
> > Regards,
> > Mohammad Tariq
> >
> >
> >
> > On Thu, Sep 27, 2012 at 2:59 AM, Mohammad Tariq <donta...@gmail.com>
> > wrote:
> >
> > > Yes. Also have a look at the logs of the problematic region if hbck
> shows
> > > any inconsistency.
> > >
> > > Regards,
> > > Mohammad Tariq
> > >
> > >
> > >
> > > On Thu, Sep 27, 2012 at 2:55 AM, Mohit Anchlia <mohitanch...@gmail.com
> > >wrote:
> > >
> > >> Which node should I look at for logs? Is this the master node? I'll
> try
> > >> hbck.
> > >>
> > >> On Wed, Sep 26, 2012 at 2:19 PM, Mohammad Tariq <donta...@gmail.com>
> > >> wrote:
> > >>
> > >> > Hello Mohit,
> > >> >
> > >> > Try hbck once and see if it shows any inconsistency. Also, you
> can
> > >> try
> > >> > restarting your cluster and deleting the table again. Having a look
> at
> > >> the
> > >> > logs could also be useful.
> > >> >
> > >> > Regards,
> > >> > Mohammad Tariq
> > >> >
> > >> >
> > >> >
> > >> > On Thu, Sep 27, 2012 at 2:24 AM, Mohit Anchlia <
> > mohitanch...@gmail.com
> > >> > >wrote:
> > >> >
> > >> > > When I try to disable table I get:
> > >> > >
> > >> > > hbase(main):011:0> disable 'SESSIONID_TIMELINE'
> > >> > > ERROR: org.apache.hadoop.hbase.TableNotEnabledException:
> > >> > > org.apache.hadoop.hbase.TableNotEnabledException:
> SESSIONID_TIMELINE
> > >> > > Here is some help for this command:
> > >> > > Start disable of named table: e.g. "hbase> disable 't1'"
> > >> > >
> > >> > > But then I try to enable I get:
> > >> > >
> > >> > > hbase(main):012:0> enable 'SESSIONID_TIMELINE'
> > >> > > ERROR: org.apache.hadoop.hbase.TableNotDisabledException:
> > >> > > org.apache.hadoop.hbase.TableNotDisabledException:
> > SESSIONID_TIMELINE
> > >> > > Here is some help for this command:
> > >> > > Start enable of named table: e.g. "hbase> enable 't1'"
> > >> > >
> > >> > > I've tried flush, major_compaction also. I tseems it's stuck in
> > >> > > inconsistent state. Could someone point me to correct direction? I
> > am
> > >> > using
> > >> > > 92.1
> > >> > >
> > >> >
> > >>
> > >
> > >
> >
>
