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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-368) TupleWritable.Comparator
Date Wed, 02 Apr 2014 14:47:16 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13957702#comment-13957702
] 

Josh Wills commented on CRUNCH-368:
-----------------------------------

Got it, I understand what you're saying. +1 for the patch as-is.

> TupleWritable.Comparator
> ------------------------
>
>                 Key: CRUNCH-368
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-368
>             Project: Crunch
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 0.10.0, 0.8.3
>            Reporter: Chao Shi
>            Assignee: Chao Shi
>         Attachments: crunch-368 benchmark.pdf, crunch-368.patch, gen_data.py
>
>
> This patch should improve comparison performance on TupleWritables. It saves the deserialization
overhead. It is particularly useful when the input tuple are large, e.g. contains long strings.
> Please note that this changes the binary format of TupleWritable. It adds a var-int indicating
size of field after each type code. This is a limitation of the writable system. We do not
know the size of each field until fully desalinizing it. 



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