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From "Feng Honghua (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9467) write can be totally blocked temporarily by a write-heavy region
Date Mon, 09 Sep 2013 13:43:51 GMT
Feng Honghua created HBASE-9467:
-----------------------------------

             Summary: write can be totally blocked temporarily by a write-heavy region
                 Key: HBASE-9467
                 URL: https://issues.apache.org/jira/browse/HBASE-9467
             Project: HBase
          Issue Type: Improvement
            Reporter: Feng Honghua
            Priority: Minor


Write to a region can be blocked temporarily if the memstore of that region reaches the threshold(hbase.hregion.memstore.block.multiplier
* hbase.hregion.flush.size) until the memstore of that region is flushed.

For a write-heavy region, if its write requests saturates all the handler threads of that
RS when write blocking for that region occurs, requests of other regions/tables to that RS
also can't be served due to no available handler threads...until the pending writes of that
write-heavy region are served after the flush is done. Hence during this time period, from
the RS perspective it can't serve any request from any table/region just due to a single write-heavy
region.

This sounds not very reasonable, right? Maybe write requests from a region can only be served
by a sub-set of the handler threads, and then write blocking of any single region can't lead
to the scenario mentioned above?

Comment?

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