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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Question on region server/data node restart
Date Tue, 24 Feb 2009 14:36:10 GMT
This is why we have a META table, it holds the location info. See
http://wiki.apache.org/hadoop/Hbase/HbaseArchitecture#client

J-D

On Tue, Feb 24, 2009 at 9:28 AM, Michael Dagaev <michael.dagaev@gmail.com>wrote:

> Thanks, Jean-Daniel.
>
> I did run hbase-daemon stop regionserver and start regionserver
> and saw the client retrying to connect to the restarted region server.
>
> How does it know to connect to another region server ? Maybe it stops
> retrying, asks master, and get another region server to connect to.
> Is it correct ?
>
> Thank you for your cooperation,
> M.
>
> On Tue, Feb 24, 2009 at 3:56 PM, Jean-Daniel Cryans <jdcryans@apache.org>
> wrote:
> > Michael,
> >
> > Regards stopping those nodes, do it using hadoop-daemon/hbase-daemon to
> stop
> > them cleanly. Requests from the clients will not "fail", they will simply
> be
> > told to look elsewhere for the regions they have in cache. Unless you
> only
> > have 1 region server...
> >
> > Regards starting the nodes, apart from the usual
> hadoop-daemon/hbase-daemon,
> > no.
> >
> > J-D
> >
> > On Tue, Feb 24, 2009 at 8:50 AM, Michael Dagaev <
> michael.dagaev@gmail.com>wrote:
> >
> >> Hi, all
> >>
> >>     As I understand, I can stop a region server and a data node in a
> >> cluster
> >> "semi-transparently" for clients, i. e. the requests handled  by the
> >> region server
> >> at that time will fail, but cluster will be working.
> >>
> >> If I start the data node and region server  I do not have to do anything
> to
> >> make
> >> them work.
> >>
> >> Is it correct ?
> >>
> >> Thank you for your cooperation,
> >> M.
> >>
> >
>

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