[
https://issues.apache.org/jira/browse/KAFKA-2859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15012174#comment-15012174
]
ASF GitHub Bot commented on KAFKA-2859:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/554
> 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
