[jira] [Created] (HIVE-5834) Avoid reading ORC footers for files which will not be split in OrcInputFormat::getSplits()

["Gopal V (JIRA)" <ji...@apache.org>]

Gopal V created HIVE-5834:
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             Summary: Avoid reading ORC footers for files which will not be split in OrcInputFormat::getSplits()
                 Key: HIVE-5834
                 URL: https://issues.apache.org/jira/browse/HIVE-5834
             Project: Hive
          Issue Type: Improvement
          Components: Tez
    Affects Versions: 0.13.0
            Reporter: Gopal V
            Assignee: Gopal V


OrcInputFormat::getSplits() fires off a SplitGenerator task for every file in the task.

The footer & data are on the same node for all files with only 1 hdfs block. On top of that, it will never need a further split as long as its total size is < context.maxSize.

Reading that footer locally is faster than reading it in the split gen and sending it from the AM.



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