Johann Abraham created LUCENE-8774:
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Summary: Performance improvement for update?optimize=true
Key: LUCENE-8774
URL: https://issues.apache.org/jira/browse/LUCENE-8774
Project: Lucene - Core
Issue Type: Improvement
Components: core/codecs
Affects Versions: 7.2.1, trunk
Reporter: Johann Abraham
Attachments:
0001-Performance-improvement-for-update-optimize-true.patch
Running optimize on a document set that has a large number of docValue fields
grows linearly with the number of docValue fields.
We discovered this because our corpus has few documents but a very large number
of dynamic docValue fields.
The cause is in the FilterFieldInfor constructor, a linear search of the
fielterFields occurs due to the filterFields.contains(...) function call.
Changing the underlying Collection type from an ArrayList to a LinkedHashSet
decreased our optimize time from 60 minutes to < 1 minute. Patch attached.
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