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From "chunhui shen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-5970) Improve the AssignmentManager#updateTimer and speed up handling opened event
Date Wed, 09 May 2012 04:45:47 GMT
chunhui shen created HBASE-5970:
-----------------------------------

             Summary: Improve the AssignmentManager#updateTimer and speed up handling opened
event
                 Key: HBASE-5970
                 URL: https://issues.apache.org/jira/browse/HBASE-5970
             Project: HBase
          Issue Type: Improvement
          Components: master
            Reporter: chunhui shen
            Assignee: chunhui shen


We found handing opened event very slow in the environment with lots of regions.

The problem is the slow AssignmentManager#updateTimer.

We do the test for bulk assigning 10w regions, the whole process of bulk assigning took 1
hours.

2012-05-06 20:31:49,201 INFO org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning
100000 region(s) round-robin across 5 server(s)
2012-05-06 21:26:32,103 INFO org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning
done

I think we could do the improvement for the AssignmentManager#updateTimer: Make a thread do
this work.
After the improvement, it took only 4.5mins

2012-05-07 11:03:36,581 INFO org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning
100000 region(s) across 5 server(s), retainAssignment=true 
2012-05-07 11:07:57,073 INFO org.apache.hadoop.hbase.master.AssignmentManager: Bulk assigning
done 

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