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From "Ferdy (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-2117) Simple check on the master overview page if the number of currently running regionservers is unchanged.
Date Tue, 12 Jan 2010 15:33:54 GMT
Simple check on the master overview page if the number of currently running regionservers is
unchanged.
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                 Key: HBASE-2117
                 URL: https://issues.apache.org/jira/browse/HBASE-2117
             Project: Hadoop HBase
          Issue Type: New Feature
          Components: master, regionserver
    Affects Versions: 0.20.2
            Reporter: Ferdy


Incidentally, it happens that some of our regionservers just stop working. The regionserver
logs show some sort of termination and the affected regionserver is just removed from the
master page. Besides the actual problem of the termination, what I was missing was some sort
of warning (from either running client code or the master page) that some regionservers are
having trouble.

It seems like the Master is ok with the fact that a regionserver suddenly decides to stop.
The result is that the clients depending on the data in Hbase will be presented an incomplete
data set, at least as long as the failing regions are not re-assigned yet. In order to have
this monitored, I decided to create a patch that exposes an extra piece of information on
the master page. An 'OK:' is presented if the current number of regionservers is unchanged
since the start of the processes. An 'ERROR:' is shown whenever the current number is not
the same. What the master page does is reading the 'regionservers' file once, and remember
the number of slaves so that is can be used in the check. (So afterwards changes to this file
are not supported).

Perhaps this is not the right way of doing things. Please let me know if there are any existing
solutions for these issues.

I will attach a patch right away.

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