Markus Gietzen created LUCENE-9972:
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Summary: Performance regression in NRTCachingDirectory
Key: LUCENE-9972
URL: https://issues.apache.org/jira/browse/LUCENE-9972
Project: Lucene - Core
Issue Type: Bug
Components: core/store
Affects Versions: 8.8.2
Reporter: Markus Gietzen
This issue has been discussed here:
[http://mail-archives.apache.org/mod_mbox/lucene-java-user/202105.mbox/%3cam0pr02mb4963712f269c5bf70951f0a3ef...@am0pr02mb4963.eurprd02.prod.outlook.com%3e]
Summary: To get the same as speed as in 8.3 I have to overwrite
NRTCachingDirectory#doCacheWrite
in 8.8 with the implementation from 8.3. Otherwise it's magnitudes slower.
It seems that the solution for
https://issues.apache.org/jira/browse/LUCENE-9115 increases the number of calls
to native-OpenFile (due to falling down to MMAP-Directory) by a very large
amount.
I understand the reasoning behind LUCENE-9115 but in fact it destroys the
performance of our product. For now sub-classing NRTCachingDirectory with the
old implementation of doCacheWrite() solves the issue but it would be great to
have an "offical" solution of course.
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