Aman Sinha created DRILL-4846:
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Summary: Eliminate extra operations during metadata cache pruning
Key: DRILL-4846
URL: https://issues.apache.org/jira/browse/DRILL-4846
Project: Apache Drill
Issue Type: Bug
Components: Metadata
Affects Versions: 1.7.0
Reporter: Aman Sinha
Assignee: Aman Sinha
Fix For: 1.8.0
While doing performance testing for DRILL-4530 using a new data set and
queries, we found two potential performance issues: (a) the metadata cache was
being read twice in some cases and (b) the checking for directory modification
time was being done twice, once as part of the first phase of directory-based
pruning and subsequently after the second phase pruning. This check gets
expensive for large number of directories. Creating this JIRA to track fixes
for these issues.
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