JiminHsieh commented on KAFKA-1623:

Can I work on this one? Thanks! I have some ideas for previous comments. I 
didn't have a good idea about 500ms waiting time though, I am working on it, 
but I think we could give a default value for the backlog by OS instead of the 
default value of JDK - 50. At Linux and macOS, it will be 128 At Win, it will 
be 200.

> kafka is sometimes slow to accept connections
> ---------------------------------------------
>                 Key: KAFKA-1623
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1623
>             Project: Kafka
>          Issue Type: Bug
>          Components: core
>    Affects Versions:
>            Reporter: Shlomi Hazan
>            Priority: Major
>              Labels: performance
> from SocketServer.scala:144
> the Acceptor can wait up to 500 millis before processing the accumulated FDs. 
> Also, the backlog of the acceptor socket seems not to be defined, which may 
> be problematic if all 500 millis are elapsed before the thread awakes. 
> setting the backlog is doable using the proper ServerSocket Ctor, and maybe 
> better be provisioned via configuration.

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