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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