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From "Siying Dong (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-1802) Encode MapReduce Shuffling Keys Differently for Single string/bigint Key
Date Tue, 23 Nov 2010 18:57:15 GMT

     [ https://issues.apache.org/jira/browse/HIVE-1802?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Siying Dong updated HIVE-1802:
------------------------------

    Attachment: HIVE-1802.2.patch

Refactored PlanUtils a little bit. I didn't come up a straight forward way to refactor to
be a factory and make it clear. I tried to break up PlanUtils to several classes, by those
return TableDesc and ReduceSyncDesc, as well as others. Hope it can be better maintained.

No function change from previous patch.

> Encode MapReduce Shuffling Keys Differently for  Single string/bigint Key
> -------------------------------------------------------------------------
>
>                 Key: HIVE-1802
>                 URL: https://issues.apache.org/jira/browse/HIVE-1802
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Siying Dong
>            Assignee: Siying Dong
>         Attachments: HIVE-1802.1.patch, HIVE-1802.2.patch
>
>
> Delimiters are not needed if we only have one shuffling key, and in the same time escaping
delimiters are not needed. We can save some CPU time on serializing and shuffle slightly less
amount of data to save memory footprint and network traffic.
> Also there is a bug that for group-by, we by mistake add a -1 to the end of the key and
pay one more unnecessary mem-copy. Can be easily fixed.

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