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https://issues.apache.org/jira/browse/LUCENE-8415?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16551147#comment-16551147
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Robert Muir commented on LUCENE-8415:
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by this i mean, use atomic rename for all index files not just segments_N. then
nobody can be reading from them until they are complete.
> 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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