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From "Chao Wang (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1342) [Zebra] Avoid making unnecessary name node calls for writes in Zebra
Date Wed, 31 Mar 2010 00:14:27 GMT
[Zebra] Avoid making unnecessary name node calls for writes in Zebra
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                 Key: PIG-1342
                 URL: https://issues.apache.org/jira/browse/PIG-1342
             Project: Pig
          Issue Type: Improvement
    Affects Versions: 0.6.0, 0.7.0
            Reporter: Chao Wang
            Assignee: Chao Wang
             Fix For: 0.8.0


Currently, table and column group level meta data is extracted from job configuration object
and written onto HDFS disk within checkOutputSpec(). Later on, writers at back end will open
these files to access the meta data for doing writes. This puts extra load to name node since
all writers need to make name node calls to open files. 

We propose the following approach to this problem:
For writers at back end, they extract meta information from job configuration object directly,
rather than making name node calls and going to HDFS disk to fetch the information.


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