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From "Robert Muir (JIRA)" <>
Subject [jira] [Updated] (LUCENE-5570) FSDirectory's fsync() is lenient
Date Fri, 04 Apr 2014 17:58:16 GMT


Robert Muir updated LUCENE-5570:

    Attachment: LUCENE-5570.patch

here is the updated patch. its unclear to me if we can do anything for 4.7.x (because of java6),
but i think we should fix this for 4.8/5.0

> FSDirectory's fsync() is lenient
> --------------------------------
>                 Key: LUCENE-5570
>                 URL:
>             Project: Lucene - Core
>          Issue Type: Bug
>          Components: core/store
>            Reporter: Robert Muir
>         Attachments: LUCENE-5570.patch, LUCENE-5570.patch, LUCENE-5570_zerobyte.patch
> This method has a lot of problems:
> 1. it tracks 'stale files' as it writes (this seems pointless), and only actually fsyncs
the intersection of that 'stale files' and the filenames passed as argument to sync(). So
any bogus names passed to sync() are just silently ignored
> 2. if "something bad happens" (e.g. two indexwriters/dirs on the same path, or some other
shenanigans), and the file is actually in stale files, but was say actually deleted on the
filesystem, the underlying fsync() call will create a new 0-byte file and fsync that.
> In my opinion we should do none of this. we should throw exceptions when this stuff is

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