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From Liu Yan <gzbigegg...@gmail.com>
Subject Re: HBase (Master) Migration
Date Sat, 28 Feb 2009 04:00:06 GMT
When I do "scan '.META.'", I see some interesting output:

{{{
 1002_profiles,7139226398444 column=info:server, timestamp=1235789710023,
value=10.254.51.127:60020
 3021,1235657605714

 1002_profiles,7139226398444 column=info:serverstartcode,
timestamp=1235789710023, value=1235789499358
 3021,1235657605714

 1002_profiles,7399192338534 column=historian:assignment,
timestamp=1235789558647, value=Region assigned to se
 9818,1235657605714          rver 10.254.51.127:60020

 1002_profiles,7399192338534 column=historian:open, timestamp=1235789577850,
value=Region opened on server : h
 9818,1235657605714          master
}}}

The IP address here is correct, pointing to the new master's IP.

But I also see the following:

{{{
 1002_profiles,7399192338534 column=info:server, timestamp=1235789577848,
value=10.254.51.127:60020
 9818,1235657605714

 1002_profiles,7399192338534 column=info:serverstartcode,
timestamp=1235789577848, value=1235789499358
 9818,1235657605714

 1002_profiles,7572817158818 column=historian:assignment,
timestamp=1235297600858, value=Region assigned to se
 3981,1235242656324          rver 10.249.190.85:60020

 1002_profiles,7572817158818 column=historian:open, timestamp=1235297623082,
value=Region opened on server : h
 3981,1235242656324          master
}}}

This is the IP of our old master's.

How to fix this?

Regards,
Yan

2009/2/28 stack <stack@duboce.net>

> If scan is working, do 'scan ".META."'.
>
> There are three columns: info:regioninfo, info:serverstartcode, and
> info:server.
>
> What do you see for info:server?  New addresses or the old?
>
> On startup, hbase should be judging the content of .META. as sour and
> reassigning regions to the servers that have just registered; i.e. those of
> the new addresses.
>
> St.Ack
>
>
> On Fri, Feb 27, 2009 at 7:15 PM, Liu Yan <gzbigegg.ml@gmail.com> wrote:
>
> > hi,
> >
> > We have a 4-node cluster Hadoop 0.19.0 and HBase 0.19.0. We run NameNode
> > and
> > RegionServer on the same server and created a bunch of tables on HBase.
> >
> > Now we want to use another (more powerful) machine to replace the old
> > master. Here is what we did:
> >
> > 1) Shutdown HBase and Hadoop
> > 2) Copy all the Hadoop related files from the old master to the new
> master.
> > 3) Re-configure the Hadoop and HBase so all (including the master and
> > clients) are now pointing to the new master.
> > 4) Start the Hadoop cluster. (This seems fine).
> > 5) Start the HBase cluster. (This seems fine too).
> >
> > Then when we try to do a "count" in HBase shell, (e.g. count
> 'table_name'),
> > we hit the following problem:
> >
> > 09/02/27 21:53:04 INFO ipc.HBaseClass: Retrying connect to server: /
> > 10.249.190.85:60020. Already tried 0 time(s).
> > 09/02/27 21:53:05 INFO ipc.HBaseClass: Retrying connect to server: /
> > 10.249.190.85:60020. Already tried 1 time(s).
> > 09/02/27 21:53:06 INFO ipc.HBaseClass: Retrying connect to server: /
> > 10.249.190.85:60020. Already tried 2 time(s).
> > 09/02/27 21:53:06 INFO ipc.HbaseRPC: Server at /10.249.190.85:60020 not
> > available yet, Zzzzz...
> > 09/02/27 21:53:06 INFO ipc.HbaseRPC: Server at /10.249.190.85:60020could
> > not be reached after 1 tries, giving up.
> > 09/02/27 21:53:09 INFO ipc.HBaseClass: Retrying connect to server: /
> > 10.249.190.85:60020. Already tried 0 time(s).
> > 09/02/27 21:53:10 INFO ipc.HBaseClass: Retrying connect to server: /
> > 10.249.190.85:60020. Already tried 1 time(s).
> > 09/02/27 21:53:11 INFO ipc.HBaseClass: Retrying connect to server: /
> > 10.249.190.85:60020. Already tried 2 time(s).
> >
> > The IP address showing here is actually the old master's IP address
> instead
> > of the new one's.
> >
> > We tried "list" and "scan" commands in the HBase shell, both of them are
> > working good. Just the "count" reported the above error.
> >
> > What's the problem here?
> >
> > Thanks,
> > Yan
> >
>

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