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From "Josh Wills (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CRUNCH-329) Re-add type info to TupleWritable to make fields sort correctly
Date Mon, 03 Feb 2014 16:54:09 GMT

    [ https://issues.apache.org/jira/browse/CRUNCH-329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13889624#comment-13889624
] 

Josh Wills commented on CRUNCH-329:
-----------------------------------

Okay, that will end up being a little ugly on the runtime side-- e.g., I construct a new TupleWritable
that may itself contain other TupleWritables (which should arguably have a built-in type code,
along with GenericArrayWritable and the MapWritable), so I'll need to provide the Configuration
object to the child TupleWritables I'll create so that they can decode themselves, etc., etc.

> Re-add type info to TupleWritable to make fields sort correctly
> ---------------------------------------------------------------
>
>                 Key: CRUNCH-329
>                 URL: https://issues.apache.org/jira/browse/CRUNCH-329
>             Project: Crunch
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 0.10.0, 0.8.3
>            Reporter: Josh Wills
>            Assignee: Josh Wills
>             Fix For: 0.10.0, 0.8.3
>
>         Attachments: CRUNCH-329.patch, fix-ss-writables.patch
>
>
> Secondary sorts aren't currently working correctly for Writable types after we hacked
the TupleWritable impl to make all of the fields BytesWritables (e.g., secondary IntWritable
values will no longer be sorted correctly, even though everything is still grouped correctly.)
> The least-bad way that I came up with to fix this is to use integer codes for each possible
WritableComparable type in a pipeline that we can use to decode what Writable type each tuple
field corresponds to. This allows us to keep the various fields sortable while still doing
a reasonable job of minimizing the serialization required to pass the type information along.



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