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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-14460) [Perf Regression] Merge of MVCC and SequenceId (HBASE-HBASE-8763) slowed Increments, CheckAndPuts, batch operations
Date Tue, 01 Dec 2015 19:14:11 GMT

    [ https://issues.apache.org/jira/browse/HBASE-14460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15034389#comment-15034389
] 

stack commented on HBASE-14460:
-------------------------------

Bryan, off-list, turned up this readless increment project from our brothers and sisters over
at Cask: https://github.com/caskdata/cdap-hbase-increments/commits/develop We should roll
it in so you don't need a CP to run it.

Bryan also is seeing slowdown in 0.98+ increments over 0.94. 0.98 does mvcc where 0.94 does
not but he is seeing hold up in obtaining a row lock.... and the mechanisms in the two versions
look similar...(0.94 allowed setting row lock id in Increment constructor... I wonder if we
were by-passing row lock... let me try it).

> [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
>         Attachments: 14460.txt, region_lock.png
>
>
> 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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