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From Ted Yu <yuzhih...@gmail.com>
Subject Re: restarting region server which shutdown due to GC pause
Date Wed, 21 Jul 2010 17:49:40 GMT
I personally think a self-healing HBase is what every HBase user expects.

On Wed, Jul 21, 2010 at 10:44 AM, Edward Capriolo <edlinuxguru@gmail.com>wrote:

> On Wed, Jul 21, 2010 at 1:40 PM, Ted Yu <yuzhihong@gmail.com> wrote:
> > J-D:
> > Can you elaborate why ssh isn't preferred ?
> >
> > One solution is to create a light weight Java process that monitors
> region
> > server log and perform this duty.
> >
> > On Wed, Jul 21, 2010 at 10:31 AM, Jean-Daniel Cryans <
> jdcryans@apache.org>wrote:
> >
> >> The stance in the hbase dev community on that issue is to let users'
> >> cluster management tools handle it.
> >>
> >> Also, how would you start a java process on a remote machine (if still
> >> alive) from another java process (the master)? If you can find an
> >> elegant way that doesn't rely on SSH, this would be a nice
> >> contribution that users could enable.
> >>
> >> J-D
> >>
> >> On Wed, Jul 21, 2010 at 10:25 AM, Ted Yu <yuzhihong@gmail.com> wrote:
> >> > Thanks for the answer.
> >> >
> >> > GC pause seems to be a major cause for region server to come down:
> >> > 2010-07-21 09:07:14,138 WARN org.apache.hadoop.hbase.util.Sleeper: We
> >> slept
> >> > 291505ms, ten times longer than scheduled: 10000
> >> >
> >> > Is it possible for HBase Master to restart dead region server in this
> >> case ?
> >> >
> >> > On Wed, Jul 21, 2010 at 10:02 AM, Jean-Daniel Cryans <
> >> jdcryans@apache.org>wrote:
> >> >
> >> >> HBaseAdmin.getClusterStatus().getServers()
> >> >>
> >> >> J-D
> >> >>
> >> >> On Wed, Jul 21, 2010 at 9:56 AM, Ted Yu <yuzhihong@gmail.com>
wrote:
> >> >> > Hi,
> >> >> > Is there API to query the number of live region servers ?
> >> >> >
> >> >> > Thanks
> >> >> >
> >> >>
> >> >
> >>
> >
>
> Ted,
> I just wrote to very relevant articles in my blog
>
> Using func instead of SSH keys
>
> http://www.edwardcapriolo.com/roller/edwardcapriolo/entry/func_hadoop_the_end_of
>
>
> http://www.edwardcapriolo.com/roller/edwardcapriolo/entry/hadoop_secondarynamenode_puppet
>
> In which I use the puppet 'service  resource' to do automatic restarts
> of a secondary namenode. You could use puppet to accomplish auto
> restarts for a region server.
>
> I usually tweet my new recipes when I come out with
> themhttp://twitter.com/@edwardcapriolo
>

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