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From "Abhishek Singh Chouhan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-17937) Memstore size becomes negative in case of expensive postPut/Delete Coprocessor call
Date Tue, 18 Apr 2017 12:44:42 GMT
Abhishek Singh Chouhan created HBASE-17937:
----------------------------------------------

             Summary: Memstore size becomes negative in case of expensive postPut/Delete Coprocessor
call
                 Key: HBASE-17937
                 URL: https://issues.apache.org/jira/browse/HBASE-17937
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.98.24, 1.3.1, 2.0.0
            Reporter: Abhishek Singh Chouhan
            Assignee: Abhishek Singh Chouhan


We ran into a situation where the memstore size became negative due to expensive postPut/Delete
Coprocessor calls in doMiniBatchMutate. We update the memstore size in the finally block of
doMiniBatchMutate, however a queued flush can be triggered during the coprocessor calls(if
they are taking time eg. index updates) since we have released the locks and advanced mvcc
at this point. The flush will turn the memstore size negative since the value subtracted is
the actual value flushed from stores. The negative value impacts the future flushes amongst
others that depend on memstore size.



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