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From edward choi <mp2...@gmail.com>
Subject Re: Does Hbase automatically restore data when regionservers fail?
Date Thu, 13 Oct 2011 00:29:34 GMT
Thank you all for the reply.

Good thing to know that Hbase automatically restores data when regionservers
fail.
That is, even when I don't use Hbase replication service right?

And sorry about posting to two lists at the same time. I thought since the
question also relates to HDFS, I'd post to Hadoop list too.

Regards,
Ed

2011/10/12 Harsh J <harsh@cloudera.com>

> Edward,
>
> HBase replication is entirely different than HDFS replication - The
> former being cross-instance replication of HBase-data-only while the
> latter replicates within nodes available in its own instance, and
> covers all data generally.
>
> Read more about it here: http://hbase.apache.org/replication.html and
> decide for yourself if you'd like to use it.
>
> (P.s. Please do not cross post to multiple lists. This question fit
> HBase's lists.)
>
> On Wed, Oct 12, 2011 at 3:04 PM, edward choi <mp2893@gmail.com> wrote:
> > Hi,
> >
> > I am using CDH3U0 Hadoop and Hbase.
> >
> > I know that HDFS automatically replicates data to multiple data nodes so
> > that when a couple of data nodes fail, the user won't lose any data.
> > I am currently using replication factor of 3.
> >
> > Now in Hbase, I know there is some experimental replication service, but
> I
> > am not using it. I thought that since HDFS already does replication,
> Hbase
> > wouldn't need additional replication.
> > Am I right on this?
> >
> > So my question would be:
> > Given that I am using HDFS replication and not using Hbase replication,
> if a
> > couple of regionservers fail, am I still able to access all the data I
> have
> > stored before?
> >
> > I would appreciate any help.
> > Thanks.
> >
> > Ed
> >
>
>
>
> --
> Harsh J
>

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