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From "Hudson (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-13497) Remove MVCC stamps from HFile when that is safe
Date Fri, 01 May 2015 03:02:06 GMT

    [ https://issues.apache.org/jira/browse/HBASE-13497?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14522701#comment-14522701
] 

Hudson commented on HBASE-13497:
--------------------------------

FAILURE: Integrated in HBase-1.2 #49 (See [https://builds.apache.org/job/HBase-1.2/49/])
HBASE-13497 Remove MVCC stamps from HFile when that is safe. (larsh: rev dc28ded74c78e601e255425f0c26652a709c80ad)
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/DefaultCompactor.java
* hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/compactions/StripeCompactor.java


> Remove MVCC stamps from HFile when that is safe
> -----------------------------------------------
>
>                 Key: HBASE-13497
>                 URL: https://issues.apache.org/jira/browse/HBASE-13497
>             Project: HBase
>          Issue Type: Sub-task
>          Components: Scanners
>            Reporter: Lars Hofhansl
>            Assignee: Lars Hofhansl
>              Labels: performance
>             Fix For: 2.0.0, 1.0.2, 1.2.0, 1.1.1
>
>         Attachments: 13497.txt
>
>
> See discussion in HBASE-13389.
> The optimization was initially put in with HBASE-8166, HBASE-12600 undoes it, this will
partially restores it.
> Instead of checking the MVCC readpoints against the oldest current scanner, we check
that all are 0, if so, we do not need to write them.



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