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https://issues.apache.org/jira/browse/KAFKA-4820?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Dong Lin resolved KAFKA-4820.
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Resolution: Fixed
> 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
> Priority: Major
>
> 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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