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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-5916) RS restart just before master intialization we make the cluster non operative
Date Tue, 29 May 2012 00:02:25 GMT

    [ https://issues.apache.org/jira/browse/HBASE-5916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13284585#comment-13284585
] 

Hudson commented on HBASE-5916:
-------------------------------

Integrated in HBase-TRUNK-on-Hadoop-2.0.0 #30 (See [https://builds.apache.org/job/HBase-TRUNK-on-Hadoop-2.0.0/30/])
    HBASE-5916 RS restart just before master intialization we make the cluster non operative
(Rajesh) (Revision 1343324)

     Result = FAILURE
ramkrishna : 
Files : 
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/HMaster.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/MasterFileSystem.java
* /hbase/trunk/hbase-server/src/main/java/org/apache/hadoop/hbase/master/ServerManager.java
* /hbase/trunk/hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestRSKilledWhenMasterInitializing.java

                
> 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: 0.96.0, 0.94.1
>
>         Attachments: HBASE-5916_94.patch, 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, HBASE-5916_trunk_v7.patch, HBASE-5916_trunk_v8.patch,
HBASE-5916_trunk_v9.patch, HBASE-5916v8.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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