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Posted to dev@lucene.apache.org by "Dawid Weiss (JIRA)" <ji...@apache.org> on 2013/05/08 22:53:17 UTC
[jira] [Resolved] (LUCENE-4987) Test framework may fail internally
under J9 (some serious JVM exclusive-section issue).
[ https://issues.apache.org/jira/browse/LUCENE-4987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Dawid Weiss resolved LUCENE-4987.
---------------------------------
Resolution: Fixed
Fix Version/s: 5.0
> Test framework may fail internally under J9 (some serious JVM exclusive-section issue).
> ---------------------------------------------------------------------------------------
>
> Key: LUCENE-4987
> URL: https://issues.apache.org/jira/browse/LUCENE-4987
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Dawid Weiss
> Assignee: Dawid Weiss
> Priority: Minor
> Fix For: 5.0
>
> Attachments: j9.zip
>
>
> This was reported by Shai. The runner failed with an exception:
> {code}
> [junit4:junit4] Caused by: java.util.NoSuchElementException
> [junit4:junit4] at java.util.ArrayDeque.removeFirst(ArrayDeque.java:289)
> [junit4:junit4] at java.util.ArrayDeque.pop(ArrayDeque.java:518)
> [junit4:junit4] at com.carrotsearch.ant.tasks.junit4.JUnit4$1.onSlaveIdle(JUnit4.java:809)
> [junit4:junit4] ... 17 more
> {code}
> The problem is that this is impossible because the code around JUnit4.java:809 looks like this:
> {code}
> final Deque<String> stealingQueue = new ArrayDeque<String>(...);
> aggregatedBus.register(new Object() {
> @Subscribe
> public void onSlaveIdle(SlaveIdle slave) {
> if (stealingQueue.isEmpty()) {
> ...
> } else {
> String suiteName = stealingQueue.pop();
> ...
> }
> }
> });
> {code}
> and the contract on Guava's EventBus states that:
> {code}
> * <p>The EventBus guarantees that it will not call a handler method from
> * multiple threads simultaneously, unless the method explicitly allows it by
> * bearing the {@link AllowConcurrentEvents} annotation. If this annotation is
> * not present, handler methods need not worry about being reentrant, unless
> * also called from outside the EventBus
> {code}
> I wrote a simple snippet of code that does it in a loop and indeed, two threads can appear in the critical section at once. This is not reproducible on Hotspot and only appears to be the problem on J9/1.7/Windows (J9 1.6 works fine).
> I'll provide a workaround in the runner (an explicit monitor seems to be working) but this is some serious J9 issue.
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