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From "Lars Hofhansl (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-13497) Remove MVCC stamps from HFile when that is safe
Date Mon, 20 Apr 2015 01:17:59 GMT

     [ https://issues.apache.org/jira/browse/HBASE-13497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Lars Hofhansl updated HBASE-13497:
----------------------------------
    Attachment: 13497.txt

Patch from HBASE-13389.
This one is not controversial, going to commit in a few days unless I hear objections.

[~stack], [~jeffreyz], FYI.


> 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, 1.0.1, 1.1.0
>
>         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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