Ryan Ernst created LUCENE-5976:
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Summary: Index upgrader should have option to do multiple segments
instead of one
Key: LUCENE-5976
URL: https://issues.apache.org/jira/browse/LUCENE-5976
Project: Lucene - Core
Issue Type: New Feature
Reporter: Ryan Ernst
Right now, index upgrader produces one gigantic segment. This can take a long
time, consume more memory than normal merges, and even sidestep the max seg
size for the delegated MergePolicy.
It would be nice to have a simpler option: create 1 upgraded segment for every
existing segment. If there are deletes that are merged away, the regulard MP
can takeover after the upgrade is complete (or even partially complete) to
merge away deletes.
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