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https://issues.apache.org/jira/browse/SOLR-11626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16245881#comment-16245881
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Erick Erickson commented on SOLR-11626:
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Not sure how related these two are but they're at least in the same vicinity.
> Filesystems do not guarantee order of directories updates
> ---------------------------------------------------------
>
> Key: SOLR-11626
> URL: https://issues.apache.org/jira/browse/SOLR-11626
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Nikolay Martynov
>
> Currently when index is written to disk the following sequence of events is
> taking place:
> * write segment file
> * sync segment file
> * write segment file
> * sync segment file
> ...
> * write list of segments
> * sync list of segments
> * rename list of segments
> * sync index directory
> This sequence leads to potential window of opportunity for system to crash
> after 'rename list of segments' but before 'sync index directory' and
> depending on exact filesystem implementation this may potentially lead to
> 'list of segments' being visible in directory while some of the segments are
> not.
> Solution to this is to sync index directory after all segments have been
> written. [This
> commit|https://github.com/mar-kolya/lucene-solr/commit/58e05dd1f633ab9b02d9e6374c7fab59689ae71c]
> shows idea implemented. I'm fairly certain that I didn't find all the places
> this may be potentially happening.
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