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From "Uwe Schindler (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-3235) TestDoubleBarrelLRUCache hangs under Java 1.5, 3.x and trunk, likely JVM bug
Date Tue, 15 Nov 2011 15:40:51 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-3235?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13150561#comment-13150561
] 

Uwe Schindler commented on LUCENE-3235:
---------------------------------------

This testcase fails, but we are using concurrent also in ParallelMultiSearcher (die, die,
die) and other places (even the indexer was partly upgraded to use ConcurrentLock). In my
opinion we should not change our code to work around that issue. Just because one test case
hangs its not guaranteed that other uses will work correctly. It brings a false security and
slows down VMs that work correctly. And it only affects very modern processors.

If we would have a logging framework in Lucene (maybe Solr could do this): It could parse
the args of Java (from system property) and look for -XX:+UseMembar, if its Java 1.5 it should
print a warning to Solr/Lucene log file.
                
> TestDoubleBarrelLRUCache hangs under Java 1.5, 3.x and trunk, likely JVM bug
> ----------------------------------------------------------------------------
>
>                 Key: LUCENE-3235
>                 URL: https://issues.apache.org/jira/browse/LUCENE-3235
>             Project: Lucene - Java
>          Issue Type: Bug
>    Affects Versions: 3.0, 3.1, 3.2, 3.3, 3.4
>            Reporter: Michael McCandless
>             Fix For: 3.5
>
>         Attachments: LUCENE-3235.patch, LUCENE-3235.patch, LUCENE-3235.patch
>
>
> Not sure what's going on yet... but under Java 1.6 it seems not to hang bug under Java
1.5 hangs fairly easily, on Linux.  Java is 1.5.0_22.
> I suspect this is relevant: http://stackoverflow.com/questions/3292577/is-it-possible-for-concurrenthashmap-to-deadlock
which refers to this JVM bug http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6865591 which
then refers to this one http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6822370
> It looks like that last bug was fixed in Java 1.6 but not 1.5.

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