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From Ted Yu <yuzhih...@gmail.com>
Subject Re: Region Server on all data node?
Date Fri, 26 Sep 2014 19:06:44 GMT
Prior to major compaction, region server may need to read HFile(s) written
by other region server(s).
This could be due to region movement, etc.

Cheers

On Fri, Sep 26, 2014 at 11:43 AM, Thomas Kwan <thomas.kwan@manage.com>
wrote:

> Thanks Ted for the pointer. A follow-up question.
>
> Will the region server always write data to its local hdfs? I am
> seeing logs that said the region server is trying to get data from
> another data nodes. Under what scenario will a region server needs to
> get data from a non-local data node?
>
> thanks
>
>
> On Fri, Sep 26, 2014 at 7:21 AM, Ted Yu <yuzhihong@gmail.com> wrote:
> > Region server should be installed on server which is a data node.
> >
> > Region server count may be lower than data node count. So some data nodes
> > would not have region server running.
> >
> > See http://hbase.apache.org/book.html#regions.arch.locality
> >
> > Cheers
> >
> > On Fri, Sep 26, 2014 at 7:02 AM, Thomas Kwan <thomas.kwan@manage.com>
> wrote:
> >
> >> Hi there,
> >>
> >> To get good read performance, should the region server be installed on
> >> every data node? (Thinking about data locality here)
> >>
> >> thanks
> >> thomas
> >>
>

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