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HBase, mail # user - Region is not online Execptions


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Re: Region is not online Execptions
arun sirimalla 2012-06-08, 06:31
Keywal,

Thanks for the information, it makes sense. I restarted the regionserver
and now looks fine.

Thanks
arun
On Thu, Jun 7, 2012 at 3:34 PM, N Keywal <[EMAIL PROTECTED]> wrote:

> Hi,
>
> You can have this if the region moved, i.e. was previously managed by
> this region server and is now managed by another. The client keeps a
> cache of the locations, so after a move it will first contact the
> wrong server. Then the client will update its cache. By default there
> are 10 internal retries so the next retry will be the right one, and
> this error should not be seen in the customer code.
>
>  In 0.96 the regions server will send back a RegionMovedException with
> the new location if the move is not too old (less than around ~5
> minutes if I remember well).
>
> N.
>
> On Thu, Jun 7, 2012 at 9:36 PM, arun sirimalla <[EMAIL PROTECTED]>
> wrote:
> > Hi,
> >
> > My Hbase cluster seems to work fine, but i see some exepctions in one of
> > the RegionServer  with below message
> >
> > 2012-06-07 19:24:48,809 DEBUG
> > org.apache.hadoop.hbase.regionserver.HRegionServer:
> > NotServingRegionException; Region is not online: -ROOT-,,0
> > 2012-06-07 19:24:56,154 DEBUG
> > org.apache.hadoop.hbase.regionserver.HRegionServer:
> > NotServingRegionException; Region is not online: -ROOT-,,0
> >
> > Though this regionserver is not Hosting the ROOT region. The -ROOT-
> region
> > is hosted by another Regionserver. Can someone please tell me why these
> > exceptions occur.
> >
> > Thanks
> > Arun
>