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https://issues.apache.org/jira/browse/LUCENE-8415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16550740#comment-16550740
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Robert Muir commented on LUCENE-8415:
-------------------------------------

you could also do no bookkeeping and simply pay the cost of more renames, 
right? Currently only the segments_N is written atomically like this. But 
writing to a temp file and then renaming at the end is pretty easy to 
understand, lots of applications do it.

> Clean up Directory contracts (write-once, no reads-before-write-completed)
> --------------------------------------------------------------------------
>
>                 Key: LUCENE-8415
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8415
>             Project: Lucene - Core
>          Issue Type: Improvement
>            Reporter: Dawid Weiss
>            Assignee: Dawid Weiss
>            Priority: Minor
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Created a PR here for early review.
> https://github.com/apache/lucene-solr/pull/424
> I changed:
> * the wording in Directory documentation to be a bit more formalized about 
> what rules a Directory should obey (and users expect).
> * modified the test framework to verify the above in mock classes.
> Currently a number of Directory implementations fail the 
> {{testReadFileOpenForWrites}} test that I added, so I'll keep working on that.



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