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From "Ying He (JIRA)" <j...@apache.org>
Subject [jira] Updated: (PIG-929) Default value of memusage for skewed join is not correct
Date Fri, 11 Sep 2009 21:59:57 GMT

     [ https://issues.apache.org/jira/browse/PIG-929?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Ying He updated PIG-929:
------------------------

    Description: default value pig.skewedjoin.reduce.memusage , which is used in skewed join,
should be set to 0.3  (was: Fragmented replicated join has a few limitations:
 - One of the tables needs to be loaded into memory
 - Join is limited to two tables

Skewed join partitions the table and joins the records in the reduce phase. It computes a
histogram of the key space to account for skewing in the input records. Further, it adjusts
the number of reducers depending on the key distribution.

We need to implement the skewed join in pig.)

> Default value of memusage for skewed join is not correct
> --------------------------------------------------------
>
>                 Key: PIG-929
>                 URL: https://issues.apache.org/jira/browse/PIG-929
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Ying He
>         Attachments: memusage.patch
>
>
> default value pig.skewedjoin.reduce.memusage , which is used in skewed join, should be
set to 0.3

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