Improve RCFile Read Speed
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Key: HIVE-2350
URL: https://issues.apache.org/jira/browse/HIVE-2350
Project: Hive
Issue Type: Improvement
Reporter: Tim Armstrong
Assignee: Tim Armstrong
Priority: Minor
By tweaking the RCFile$Reader implementation to allow more efficient memory
access I was able to reduce CPU usage. I measured the speed required to scan a
gzipped RCFile, decompress and assemble into records. CPU time was reduced by
about 7% for a full table scan, An improvement of about 2% was realised when a
smaller subset of columns (3-5 out of tens) were selected.
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