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From "Uwe Schindler (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2421) Hardening of NativeFSLock
Date Sat, 01 May 2010 07:29:53 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12862994#action_12862994
] 

Uwe Schindler commented on LUCENE-2421:
---------------------------------------

bq. The file created included the @ character, which is valid on Windows (and also verified
on Linux). But I'm still not sure about using it, because if a system returns a character
that is not a valid file character, we may not get the same file name we think ... so maybe
if we still want to use it, we should move it to the end of the string, so that the name includes
the random number for sure ... what do you think?

I suggested on IRC to take the output of getName() and do a regexp replace and replace all
non ACSII-digit chars:
{code}
ManagementFactory.getRuntimeMXBean().getName().replaceAll("[^a..zA..Z0..9]","")
{code}
Or alternatively simply use the hashCode of that String (but that is less unique).

> 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, 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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