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From "Sean Busbey (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-15082) Fix merge of MVCC and SequenceID performance regression
Date Mon, 11 Jan 2016 22:36:40 GMT

    [ https://issues.apache.org/jira/browse/HBASE-15082?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15092831#comment-15092831
] 

Sean Busbey commented on HBASE-15082:
-------------------------------------

{quote}
The write pipeline changed a load with HBASE-12751. Porting the 'hack' from branch-1.1 is
mostly done as part of this attached patch. I could spend time distilling and testing just
forward porting the 'hack' for a 1.2. Preferred trying to do the proper 'fix' given HBASE-12751
opens up new vistas allowing reordering of when edits are sync'd and when they can go to memstore.
{quote}

Now I see my confusion. HBASE-12751 is marked as only 2.0.0, so I wasn't sure why it'd be
relevant. I see that HBASE-14465 backported it to branch-1.

How far away is a fix for the current 1.2 blocker?

> Fix merge of MVCC and SequenceID performance regression
> -------------------------------------------------------
>
>                 Key: HBASE-15082
>                 URL: https://issues.apache.org/jira/browse/HBASE-15082
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Performance
>            Reporter: stack
>            Assignee: stack
>            Priority: Critical
>             Fix For: 2.0.0, 1.2.0, 1.3.0
>
>         Attachments: 15082.patch, 15082v2.patch, 15082v2.txt, 15082v3.txt, 15082v4.patch,
15082v5.patch, 15082v6.patch, 15082v7.patch
>
>
> This is general fix for increments (appends, checkAnd*) perf-regression identified in
the parent issue. HBASE-15031 has a narrow fix for branch-1.1 and branch-1.0.



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