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https://issues.apache.org/jira/browse/LUCENE-7345?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15339529#comment-15339529
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ASF subversion and git services commented on LUCENE-7345:
---------------------------------------------------------

Commit c311eb1b7ed72731cb7bd49e7fa3fcc23ddd7c04 in lucene-solr's branch 
refs/heads/master from Mike McCandless
[ https://git-wip-us.apache.org/repos/asf?p=lucene-solr.git;h=c311eb1 ]

LUCENE-7345: RAMDirectory now enforces write-once as well


> Make RAMDir write-once for files
> --------------------------------
>
>                 Key: LUCENE-7345
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7345
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Robert Muir
>         Attachments: LUCENE-7345.patch, LUCENE-7345.patch, LUCENE-7345.patch, 
> LUCENE-7345.patch
>
>
> See http://jenkins.thetaphi.de/job/Lucene-Solr-master-MacOSX/3349
> The bug here is that we do this crazy copyFrom of all the index files without 
> fsyncing it. So MockDirectoryWrapper treats it as corrupted.
> But while investigating I noticed that RAMdir is incredibly lenient, will 
> happily truncate existing files and so on. I think we should fix that here 
> too.



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