Rajesh Balamohan created HIVE-7052:
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Summary: Optimize split calculation time
Key: HIVE-7052
URL: https://issues.apache.org/jira/browse/HIVE-7052
Project: Hive
Issue Type: Bug
Environment: hive + tez
Reporter: Rajesh Balamohan
Assignee: Rajesh Balamohan
When running a TPC-DS query (query_27), significant amount of time was spent
in split computation on a dataset of size 200 GB (ORC format).
Profiling revealed that,
1. Lot of time was spent in Config's subtitutevar (regex) in
HiveInputFormat.getSplits() method.
2. FileSystem was created repeatedly in OrcInputFormat.generateSplitsInfo().
I will attach the profiler snapshots soon.
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