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From "Daniel John Debrunner (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-818) IndexWriter should detect when it's used after being closed
Date Sun, 04 Mar 2007 00:47:57 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12477716
] 

Daniel John Debrunner commented on LUCENE-818:
----------------------------------------------

>> Yes, but it's not just thread scheduling, it's also lack of memory
>> barriers. The 2nd thread may *never* see the close(), depending on
>> the exact architecture of machine and the JVM.

>Yikes. Is this the Java memory model issue? Ie, there is no hard
>guarantee on when a "write" from one thread will be visible to other
>threads, unless you use "volatile"? 

Doesn't crossing a synchronization barrier ensure that all threads will seem the same value
of a field?

> IndexWriter should detect when it's used after being closed
> -----------------------------------------------------------
>
>                 Key: LUCENE-818
>                 URL: https://issues.apache.org/jira/browse/LUCENE-818
>             Project: Lucene - Java
>          Issue Type: Bug
>          Components: Index
>    Affects Versions: 2.1
>            Reporter: Michael McCandless
>         Assigned To: Michael McCandless
>            Priority: Minor
>         Attachments: LUCENE-818.patch, LUCENE-818.take2.patch
>
>
> Spinoff from this thread on java-user:
>     http://www.gossamer-threads.com/lists/lucene/java-user/45986
> If you call addDocument on IndexWriter after it's closed you'll hit a
> hard-to-explain NullPointerException (because the RAMDirectory was
> closed).  Before 2.1, apparently you won't hit any exception and the
> IndexWrite will keep running but will have released it's write lock (I
> think).
> I plan to fix IndexWriter methods to throw an IllegalStateException if
> it has been closed.

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