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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5916) RS restart just before master intialization we make the cluster non operative
Date Fri, 25 May 2012 01:01:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13282882#comment-13282882
] 

chunhui shen commented on HBASE-5916:
-------------------------------------

@ram
bq.In joinCluster(), as per the existing code if any new server has checked in and the root/meta
had got assigned to it in joincluster we may think that it is an dead server because we alerady
have passed the online servers.

If we consider it as a dead server, what error will be caused? 
I think no error. Because, it must be a new regionserver (which is restarted right now), there
is no regions carried by it. Of course, we won't assign region to it, but I think it is nothing.

Correct me if wrong, thanks 
                
> RS restart just before master intialization we make the cluster non operative
> -----------------------------------------------------------------------------
>
>                 Key: HBASE-5916
>                 URL: https://issues.apache.org/jira/browse/HBASE-5916
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.92.1, 0.94.0
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>            Priority: Critical
>             Fix For: 0.94.1
>
>         Attachments: HBASE-5916_trunk.patch, HBASE-5916_trunk_1.patch, HBASE-5916_trunk_1.patch,
HBASE-5916_trunk_2.patch, HBASE-5916_trunk_3.patch, HBASE-5916_trunk_4.patch, HBASE-5916_trunk_v5.patch,
HBASE-5916_trunk_v6.patch
>
>
> Consider a case where my master is getting restarted.  RS that was alive when the master
restart started, gets restarted before the master initializes the ServerShutDownHandler.
> {code}
> serverShutdownHandlerEnabled = true;
> {code}
> In this case when the RS tries to register with the master, the master will try to expire
the server but the server cannot be expired as still the serverShutdownHandler is not enabled.
> This case may happen when i have only one RS gets restarted or all the RS gets restarted
at the same time.(before assignRootandMeta).
> {code}
> LOG.info(message);
>       if (existingServer.getStartcode() < serverName.getStartcode()) {
>         LOG.info("Triggering server recovery; existingServer " +
>           existingServer + " looks stale, new server:" + serverName);
>         expireServer(existingServer);
>       }
> {code}
> If another RS is brought up then the cluster comes back to normalcy.
> May be a very corner case.

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