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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1351) need to be able to rolling restart hbase
Date Fri, 22 May 2009 05:52:46 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1351?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12711955#action_12711955

stack commented on HBASE-1351:

With JD's patch, there's a basic rolling restart in place... Seems to work in testing.  Can
update at least point releases where RPC don't change and no data migration needed.  I did
up a wiki page: http://wiki.apache.org/hadoop/Hbase/RollingRestart.  We probably need to make
the whole operation smoother but I figure we can open new issues as we learn more practising
rolling restarts.  OK to close this one?

> need to be able to rolling restart hbase
> ----------------------------------------
>                 Key: HBASE-1351
>                 URL: https://issues.apache.org/jira/browse/HBASE-1351
>             Project: Hadoop HBase
>          Issue Type: Bug
>    Affects Versions: 0.20.0
>            Reporter: ryan rawson
>            Assignee: stack
>             Fix For: 0.20.0
> Once a hbase install goes live, unless you can take the readers offline, you cannot stop
and start the cluster to issue config changes, and other generalized changes.
> We need to do a rolling restart.  My own experiments confirmed that:
> - Restarting a regionserver works, you lose access to those regions, but comes back when
that regionserver restarts moments later. Maybe there should be a 'reassign these regions
because i am going to shut down' flag/code/command.
> - Restarting .META. regionserver just does not work.  The master becomes confused.  I
have seen it reassign the .META. but not update -ROOT-, now no one knows where it is, and
the root/meta scanners in the master just get hung.
> - Cant restart master yet, need multi-master election via ZK to make this happen.
> This is a combo bug/feature request. 

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