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https://issues.apache.org/jira/browse/KAFKA-2859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15012010#comment-15012010
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ASF GitHub Bot commented on KAFKA-2859:
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GitHub user ewencp opened a pull request:
https://github.com/apache/kafka/pull/554
KAFKA-2859: Fix deadlock in WorkerSourceTask.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ewencp/kafka
kafka-2859-deadlock-worker-source-task
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/554.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #554
----
commit 30ae78f2e58a56319b7d173c6e308e9c37214eee
Author: Ewen Cheslack-Postava <m...@ewencp.org>
Date: 2015-11-18T19:38:29Z
KAFKA-2859: Fix deadlock in WorkerSourceTask.
----
> Deadlock in WorkerSourceTask
> ----------------------------
>
> Key: KAFKA-2859
> URL: https://issues.apache.org/jira/browse/KAFKA-2859
> Project: Kafka
> Issue Type: Bug
> Components: copycat
> Reporter: Ewen Cheslack-Postava
> Assignee: Ewen Cheslack-Postava
> Priority: Blocker
> Fix For: 0.9.0.0
>
>
> There is a potential deadlock due to synchronization used around both the
> producer.send() and in the produce callback in WorkerSourceTask. This can be
> triggered, for example, if:
> 1. WorkerSourceTask work thread is running sendRecords and therefore owns the
> lock on itself, then invokes producer.send() and needs a metadata update
> (sending to a new topic), which causes it to wait on the Metadata class,
> which is notified by the Sender thread when it has updated metadata.
> 2. Sender thread is processing a message completion, invokes the callback in
> WorkerSourceTask, which then tries to invoke recordSent, which needs to
> acquire the WorkerSourceTask lock. It will wait on this lock and never
> process the metadata update request, so the other thread will never proceed
> either.
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