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https://issues.apache.org/jira/browse/LUCENE-9889?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ricardo Anguiano updated LUCENE-9889:
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Reporter: Rahul Goswami (was: Rahul Goswami)
> Lucene (unexpected ) fsync on existing segments
> -----------------------------------------------
>
> Key: LUCENE-9889
> URL: https://issues.apache.org/jira/browse/LUCENE-9889
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/index
> Affects Versions: 7.7.2
> Reporter: Rahul Goswami
> Priority: Major
>
>
> If one of the existing segment files is opened by another (say a 3rd party)
> process, it can causing a parallel commit to fail with an error complaining
> about the index files to be locked by another process. Upon debugging, I see
> that fsync is being called during commit on already existing segment files,
> and failure to open the file in write mode causes this. But this should not
> be an expected behavior since there is no reason for a commit to open an
> existing segment file in WRITE mode to fsync. Please note that in this case,
> the index file was also a part of a saved commit point, so there is all the
> more reason to not fsync it.
>
> The line of code I am referring to is as below:
> try (final FileChannel file = FileChannel.open(fileToSync, isDir ?
> StandardOpenOption.READ : StandardOpenOption.WRITE))
>
> in method fsync(Path fileToSync, boolean isDir) of the class file
>
> lucene\core\src\java\org\apache\lucene\util\IOUtils.java
>
>
> Opening this Jira after discussion with Mike McCandless and Michael Sokolov
> on the dev mailing list here:
> [Lucene - Java Developer - Lucene (unexpected ) fsync on existing segments
> (nabble.com)|https://lucene.472066.n3.nabble.com/Lucene-unexpected-fsync-on-existing-segments-td4469731.html]
>
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