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From "ramkrishna.s.vasudevan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5875) Process RIT and Master restart may remove an online server considering it as a dead server
Date Wed, 25 Apr 2012 11:08:02 GMT
ramkrishna.s.vasudevan created HBASE-5875:
---------------------------------------------

             Summary: Process RIT and Master restart may remove an online server considering
it as a dead server
                 Key: HBASE-5875
                 URL: https://issues.apache.org/jira/browse/HBASE-5875
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.92.1
            Reporter: ramkrishna.s.vasudevan
             Fix For: 0.94.0


If on master restart it finds the ROOT/META to be in RIT state, master tries to assign the
ROOT region through ProcessRIT.

Master will trigger the assignment and next will try to verify the Root Region Location.
Root region location verification is done seeing if the RS has the region in its online list.
If the master triggered assignment has not yet been completed in RS then the verify root region
location will fail.
Because it failed 
{code}
splitLogAndExpireIfOnline(currentRootServer);
{code}
we do split log and also remove the server from online server list. Ideally here there is
nothing to do in splitlog as no region server was restarted.

So master, though the server is online, master just invalidates the region server.
In a special case, if i have only one RS then my cluster will become non operative.


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