[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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