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https://issues.apache.org/jira/browse/LUCENE-8048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16277784#comment-16277784
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Erick Erickson commented on LUCENE-8048:
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Fella goes out for a run and comes back and some kind person shows him how to
solve the problem. Or maybe solves it for me... I'll run it through the rest of
its paces, precommit test and the like, as well as, perhaps, finally figure out
what that MockDirectoryWrapper is doing.
Thanks a bunch Simon!
> Filesystems do not guarantee order of directories updates
> ---------------------------------------------------------
>
> Key: LUCENE-8048
> URL: https://issues.apache.org/jira/browse/LUCENE-8048
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Nikolay Martynov
> Assignee: Erick Erickson
> Attachments: LUCENE-8048.patch, LUCENE-8048.patch, Screen Shot
> 2017-11-22 at 12.34.51 PM.png
>
>
> 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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