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https://issues.apache.org/jira/browse/KAFKA-4820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15889476#comment-15889476
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ASF GitHub Bot commented on KAFKA-4820:
---------------------------------------
GitHub user lindong28 opened a pull request:
https://github.com/apache/kafka/pull/2619
KAFKA-4820; ConsumerNetworkClient.send() should not require global lock
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/lindong28/kafka KAFKA-4820
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/kafka/pull/2619.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 #2619
----
commit 6a06f25748e7ff47eae27a5e40e74b2d9ac746e9
Author: Dong Lin <lindon...@gmail.com>
Date: 2017-03-01T04:15:11Z
KAFKA-4820; ConsumerNetworkClient.send() should not require global lock
----
> ConsumerNetworkClient.send() should not require global lock
> -----------------------------------------------------------
>
> Key: KAFKA-4820
> URL: https://issues.apache.org/jira/browse/KAFKA-4820
> Project: Kafka
> Issue Type: Bug
> Reporter: Dong Lin
> Assignee: Dong Lin
>
> Currently `ConsumerNetworkClient.send()` needs to acquire global lock of
> `ConumserNetworkClient` in order to enqueue requests. If another thread has
> called `ConsumerNetworkClient.poll(..)`, that thread may be holding the lock
> while blocked on `nioSelector.select(ms)`. This causes problem because the
> user thread which calls `ConsumerNetworkClient.send()` will also block
> waiting for that `nioSelector.select(ms)` to finish.
> One way to address this problem is to use `synchronized (unsent)` to protect
> access to `ConsumeNetworkClient.unsent` instead of protecting it using a
> global lock. So that user thread should be able to enqueue requests
> immediately while another thread is blocked on `nioSelector.select(ms)`.
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