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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 01:15:59 GMT

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

Lars Hofhansl updated HBASE-13497:
----------------------------------
    Description: 
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.

  was:
See discussion in HBASE-13389.
HBASE-12600 undoes some optimizations, this will partially restore one of them.


> 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
>
>
> 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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