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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-20875) MemStoreLABImp::copyIntoCell uses 7% CPU when writing
Date Thu, 12 Jul 2018 02:38:00 GMT
stack created HBASE-20875:
-----------------------------

             Summary: MemStoreLABImp::copyIntoCell uses 7% CPU when writing
                 Key: HBASE-20875
                 URL: https://issues.apache.org/jira/browse/HBASE-20875
             Project: HBase
          Issue Type: Sub-task
            Reporter: stack


Looks like this with a PE random write loading:

{code}
 ./hbase/bin/hbase  --config ~/conf_hbase org.apache.hadoop.hbase.PerformanceEvaluation --nomapred
--presplit=40  --size=30 --columns=10 --valueSize=100 randomWrite 200
{code}

... against a single server.

{code}
12.47%  perf-91935.map                                                                   
        [.] Lorg/apache/hadoop/hbase/BBKVComparator;::compare
 10.42%  libjvm.so                                                                       
         [.] ParNewGeneration::copy_to_survivor_space_avoiding_promotion_undo(ParScanThreadState*,
oopDesc*, unsigned long, markOopDesc*)
  6.78%  perf-91935.map                                                                  
         [.] Lorg/apache/hadoop/hbase/regionserver/MemStoreLABImpl;::copyCellInto
....
{code}

These are top CPU consumers using perf-map-agent ./bin/perf-java-top... 



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