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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-5916) RS restart just before master intialization we make the cluster non operative
Date Thu, 03 May 2012 05:02:00 GMT

     [ https://issues.apache.org/jira/browse/HBASE-5916?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

ramkrishna.s.vasudevan updated HBASE-5916:
------------------------------------------

    Priority: Critical  (was: Major)

Upped the priority of this defect. While master is coming up
{code}
1->Wait for region server to register
2->Get the online server list
3-> Start splitting the logs
{code}

Between step 2 and 3 if another new region server registers, we just split the logs of the
new region server and in fact delete the HLog folder for that new region server. This seems
critical. 
While analysing the issue for  which this JIRA was created we ended up in this problem.

                
> 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
>
>
> 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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