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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2421) Hardening of NativeFSLock
Date Fri, 30 Apr 2010 19:56:53 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862835#action_12862835
] 

Mark Miller commented on LUCENE-2421:
-------------------------------------

bq. Wait, how come? (SimpleFSLF does this, but native gets a "real" lock).

Yeah, this doesn't make sense to me either - native file locks don't care if the file is preexisting
or not. It shouldnt matter if the file is already there or needs to be created. Its just a
dummy file to get the lock on - even you start Lucene and the file exists, there will be no
lock on it, so it won't matter.

> Hardening of NativeFSLock
> -------------------------
>
>                 Key: LUCENE-2421
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2421
>             Project: Lucene - Java
>          Issue Type: Improvement
>          Components: Index
>            Reporter: Shai Erera
>            Assignee: Shai Erera
>             Fix For: 3.1
>
>         Attachments: LUCENE-2421.patch
>
>
> NativeFSLock create a test lock file which its name might collide w/ another JVM that
is running. Very unlikely, but still it happened a couple of times already, since the tests
were parallelized. This may result in a false exception thrown from release(), when the lock
file's delete() is called and returns false, because the file does not exist (deleted by another
JVM already). In addition, release() should give a second attempt to delete() if it fails,
since the file may be held temporarily by another process (like AntiVirus) before it fails.
The proposed changes are:
> 1) Use ManagementFactory.getRuntimeMXBean().getName() as part of the test lock name (should
include the process Id)
> 2) In release(), if delete() fails, check if the file indeed exists. If it is, let's
attempt a re-delete() few ms later.
> 3) If (3) still fails, throw an exception. Alternatively, we can attempt a deleteOnExit.
> I'll post a patch later today.

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