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From "nkeywal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7247) Assignment performances decreased by 50% because of regionserver.OpenRegionHandler#tickleOpening
Date Fri, 30 Nov 2012 17:51:59 GMT
nkeywal created HBASE-7247:
------------------------------

             Summary: Assignment performances decreased by 50% because of regionserver.OpenRegionHandler#tickleOpening
                 Key: HBASE-7247
                 URL: https://issues.apache.org/jira/browse/HBASE-7247
             Project: HBase
          Issue Type: Improvement
          Components: master, Region Assignment, regionserver
    Affects Versions: 0.96.0
            Reporter: nkeywal
            Assignee: nkeywal
            Priority: Critical


The regionserver.OpenRegionHandler#tickleOpening updates the region znode as "Do this so master
doesn't timeout this region-in-transition.".
However, on the usual test, this makes the assignment time of 1500 regions goes from 70s to
100s, that is, we're 50% slower because of this.
More generally, ZooKeper commits to disk all the data update, and this takes time. Using it
to provide a keep alive seems overkill. At the very list, it could be made asynchronous.

I'm not sure how necessary these updates are required (I need to go deeper in the internal,
feedback welcome), but it seems very important to optimize this... The trival fix would be
to make this optional.


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