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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HBASE-1351) need to be able to rolling restart hbase
Date Thu, 21 May 2009 20:55:45 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1351?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

stack reassigned HBASE-1351:

    Assignee: stack

> 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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