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From "Christopher Tubbs (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (ACCUMULO-4066) Conditional mutation processing performance could be improved.
Date Tue, 09 Feb 2016 21:22:18 GMT

     [ https://issues.apache.org/jira/browse/ACCUMULO-4066?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Christopher Tubbs resolved ACCUMULO-4066.
-----------------------------------------
    Resolution: Fixed

Marking this as fixed for now, in prep for 1.6.5 release. New tests for IteratorUtil can be
done in a separate ticket, if necessary.

> Conditional mutation processing performance could be improved.
> --------------------------------------------------------------
>
>                 Key: ACCUMULO-4066
>                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4066
>             Project: Accumulo
>          Issue Type: Improvement
>          Components: tserver
>    Affects Versions: 1.6.4, 1.7.0
>            Reporter: Keith Turner
>            Assignee: Keith Turner
>             Fix For: 1.6.5, 1.7.1, 1.8.0
>
>          Time Spent: 0.5h
>  Remaining Estimate: 0h
>
> When processing conditional mutations tablets reads are done.   The way the current implementation
does tablet reads has a lot of overhead.   For each condition the following is done :
>  * Opens and reserves iterators files.
>  * Parse table iterators from table config (involves scanning and filtering entire table
config)
>  * Merges condition iterators and table iterators
>  * Constructs iterator stack.
> I created a branch where these operations (except for constructing iterator stack) are
done per tablet and/or per batch of conditional mutations.   Doing this I am seeing a 3x speed
up in conditional mutation processing rates when data is cached.



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