Feng Honghua created HBASE-9467:
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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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