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From "stack (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-15082) Fix merge of MVCC and SequenceID performance regression
Date Tue, 12 Jan 2016 08:27:39 GMT

     [ https://issues.apache.org/jira/browse/HBASE-15082?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-15082:
--------------------------
    Attachment: 15082v8.patch

Address [~anoop.hbase] and [~ramkrishna] feedback. The mvccNum not assigned was a good one
in particular.

Unifies how we set sequenceid on a Cell post WAL write.

Adds in the missing READ_UNCOMMITTED when doing the Get as part of a read-modify op like increment/append.

Adds wait on sequenceid assign needed when no sync going on (this is rare event but does loop/sleep
because no more latches).

Move WAL messing to WALUtil and did some cleanup.

Clean some checkstyle.

Lets see how this does.

> 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, 15082v8.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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