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https://issues.apache.org/jira/browse/LUCENE-3803?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13211624#comment-13211624
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Robert Muir commented on LUCENE-3803:
-------------------------------------
This is not really related to your problem (somewhat) but I also looked at the
code:
I'm not sure how many queries you are running at once, but for a 'count'
operation I'm not sure
I would even pass a executor service... unless maybe your queries are really
intensive to compute
if a document is a match or not.
You would have to test: it might be better to just run single-threaded searches
for counting in
your case, especially if you have multiple threads querying the index at once
anyway.
> Using a searcher with an executor service does not work from within a
> Callable called by that same executor service
> -------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-3803
> URL: https://issues.apache.org/jira/browse/LUCENE-3803
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/search
> Affects Versions: 3.5
> Reporter: Benson Margulies
> Attachments: lucene-tc.tgz
>
>
> The test case I'm about to attach creates an executor service uses invokeAll
> to run things from it. The 'things' (Callable) that it runs in turn run
> Lucene searchers using a searcher that has the very same executor service.
> This turns out to hit some sort of deadlock related to the executor service
> queue.
> I won't be terribly surprised if this is really a matter of a fundamental
> limitation of the executor service, but if nothing else this JIRA might
> provoke a warning in the javadoc. Or, what do I know, maybe there's a way
> Lucene could interact with the executor service that gets along with this?
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