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https://issues.apache.org/jira/browse/PIG-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chao Wang updated PIG-1342:
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Attachment: PIG-1342.patch
> [Zebra] Avoid making unnecessary name node calls for writes in Zebra
> --------------------------------------------------------------------
>
> 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
>
> Attachments: PIG-1342.patch, PIG-1342.patch
>
>
> 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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