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From "Siying Dong (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-1802) Encode MapReduce Shuffling Keys Differently for Single string/bigint Key
Date Fri, 19 Nov 2010 20:10:13 GMT
Encode MapReduce Shuffling Keys Differently for  Single string/bigint Key
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                 Key: HIVE-1802
                 URL: https://issues.apache.org/jira/browse/HIVE-1802
             Project: Hive
          Issue Type: Improvement
            Reporter: Siying Dong
            Assignee: Siying Dong


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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