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From "Daniel Dai (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (PIG-4803) Improve performance of regex-based builtin functions
Date Mon, 15 Feb 2016 06:33:18 GMT

     [ https://issues.apache.org/jira/browse/PIG-4803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Daniel Dai resolved PIG-4803.
       Resolution: Fixed
     Hadoop Flags: Reviewed
    Fix Version/s: 0.16.0

+1. Patch committed to trunk.

> Improve performance of regex-based builtin functions
> ----------------------------------------------------
>                 Key: PIG-4803
>                 URL: https://issues.apache.org/jira/browse/PIG-4803
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Eyal Allweil
>            Assignee: Eyal Allweil
>              Labels: perfomance, regex
>             Fix For: 0.16.0
>         Attachments: PIG-4803.patch
> There are three strategies used by Pig's regex-based built in functions.
> 1) REPLACE doesn't do any pattern caching.
> 2) REGEX_EXTRACT and REGEX_EXTRACT_ALL attempt to cache a single pattern as an instance
> 3) PluckTuple attempts to cache a single pattern statically. (doesn't this cause problems
if two clashing defines for different PluckTuples are used?)
> I have a little fix and a medium fix in mind. The little fix is to give REPLACE a similar
caching strategy, and to fix PluckTuple, if the static nature of the pattern is indeed a problem.
> The medium fix is to make all four functions take an additional constructor with a constant
regex (and therefore one less argument in evaluation) and use that if it exists. This would
be backwards compatible, should barely (or not) affect the performance of the existing code
path, but I think that in cases where there are two clashing usages of the functions in the
same foreach..generate it would allow the pattern caching to work.

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