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From "ryan rawson (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1351) need to be able to rolling restart hbase
Date Mon, 27 Apr 2009 20:21:30 GMT
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
             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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