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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-14460) [Perf Regression] Merge of MVCC and SequenceId (HBASE-HBASE-8763) slowed Increments, CheckAndPuts, batch operations
Date Tue, 22 Sep 2015 05:09:04 GMT
stack created HBASE-14460:
-----------------------------

             Summary: [Perf Regression] Merge of MVCC and SequenceId (HBASE-HBASE-8763) slowed
Increments, CheckAndPuts, batch operations
                 Key: HBASE-14460
                 URL: https://issues.apache.org/jira/browse/HBASE-14460
             Project: HBase
          Issue Type: Bug
          Components: Performance
            Reporter: stack
            Assignee: stack
            Priority: Critical


As reported by 鈴木俊裕 up on the mailing list -- see "Performance degradation between
CDH5.3.1(HBase0.98.6) and CDH5.4.5(HBase1.0.0)" -- our unification of sequenceid and MVCC
slows Increments (and other ops) as the mvcc needs to 'catch up' to our current point before
we can read the last Increment value that we need to update.

We can say that our Increment is just done wrong, we should just be writing Increments and
summing on read, but checkAndPut as well as batching operations have the same issue. Fix.



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