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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 00:31:38 GMT
Oh, my mistake on the last question. I was still confused about the concept
of Hbase replication service.
Scratch my last question.

Ed

2011/10/13 edward choi <mp2893@gmail.com>

>
> 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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