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Posted to issues@lucene.apache.org by "Michael McCandless (Jira)" <ji...@apache.org> on 2021/08/30 16:03:00 UTC
[jira] [Created] (LUCENE-10078) Enable merge-on-refresh by default?
Michael McCandless created LUCENE-10078:
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Summary: Enable merge-on-refresh by default?
Key: LUCENE-10078
URL: https://issues.apache.org/jira/browse/LUCENE-10078
Project: Lucene - Core
Issue Type: Improvement
Reporter: Michael McCandless
This is a spinoff from the discussion in LUCENE-10073.
The newish merge-on-refresh ([crazy origin story|https://blog.mikemccandless.com/2021/03/open-source-collaboration-or-how-we.html]) feature is a powerful way to reduce searched segment counts, especially helpful for applications using many indexing threads. Such usage will write many tiny segments on each refresh, which could quickly be merged up during the {{refresh}} operation.
We would have to implement a default for {{findFullFlushMerges}} (LUCENE-10064 is open for this), and then we would need {{IndexWriterConfig.getMaxFullFlushMergeWaitMillis}} a non-zero value (this issue).
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