[jira] [Commented] (KAFKA-1623) kafka is sometimes slow to accept connections

["Guozhang Wang (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/KAFKA-1623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14121473#comment-14121473 ] 

Guozhang Wang commented on KAFKA-1623:
--------------------------------------

Thanks for pointing it out Shlomi. I think this can be fixed by reducing the select time (e.g. 100ms) and setting a proper tcp backlog time long enough so that the thread will be awaken quickly once the connection is opened. The reason I prefer not to make them configurable is that in practice a proper universal value for such configs may be good enough for all scenarios and adding more such configs may swamped the number of switches displayed to users.

> 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: 0.9.0
>            Reporter: Shlomi Hazan
>              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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