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From "Shai Erera (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2421) Hardening of NativeFSLock
Date Mon, 03 May 2010 09:51:56 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2421?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863288#action_12863288
] 

Shai Erera commented on LUCENE-2421:
------------------------------------

That's just so that we "behave nicely" with the application and not leave behind the lock
file. I'm thinking that if you see a write.lock file in the directory, it makes you wonder
why it's there, and if the index was closed properly or not etc. The existence of the file
does not tell you anything about which LF is used (Native or Simple) and so you cannot know
for sure what went wrong. Going the extra mile, even if it's only in rare cases, seems harmless,
no?

I don't think it's critical, but I also don't think the code complicates matters?

> 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, 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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