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From Ted Yu <yuzhih...@gmail.com>
Subject Re: On HBase Read Replicas
Date Sat, 11 Feb 2017 23:40:50 GMT
Please take a look at the design doc attached to
https://issues.apache.org/jira/browse/HBASE-10070.

Your first question would be answered by that document.

Cheers

On Sat, Feb 11, 2017 at 2:06 PM, jeff saremi <jeffsaremi@hotmail.com> wrote:

> The first time I heard replicas in HBase the following thought immediately
> came to my mind:
> To alleviate the load in read-heavy clusters, one could assign Region
> servers to be replicas of others so that the load is distributed and there
> is less pressure on the main RS.
>
> Just 2 days ago a colleague quoted a paragraph from HBase manual that
> contradicted this completely. Apparently, the replicas do not help with the
> load but they actually contribute to more traffic on the network and on the
> underlying file system
>
> Would someone be able to give us some insight on why anyone would want
> replicas?
>
> And also could one easily change this behavior in the HBase native Java
> client to support what I had been imagining as the concept for replicas?
>
>
> thanks
>

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