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Posted to dev@hbase.apache.org by "stack (JIRA)" <ji...@apache.org> on 2018/07/12 02:38:00 UTC

[jira] [Created] (HBASE-20875) MemStoreLABImp::copyIntoCell uses 7% CPU when writing

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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