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From "Namit Jain (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HIVE-1802) Encode MapReduce Shuffling Keys Differently for Single string/bigint Key
Date Mon, 22 Nov 2010 01:59:14 GMT

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

Namit Jain updated HIVE-1802:
-----------------------------

    Status: Open  (was: Patch Available)

> 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
>
>
> 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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