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https://issues.apache.org/jira/browse/KAFKA-2614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14952069#comment-14952069
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ASF GitHub Bot commented on KAFKA-2614:
---------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/kafka/pull/288
> No more clients can connect after `TooManyConnectionsException` threshold
> (max.connections.per.ip) is reached
> -------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-2614
> URL: https://issues.apache.org/jira/browse/KAFKA-2614
> Project: Kafka
> Issue Type: Bug
> Components: core
> Affects Versions: 0.8.2.1
> Environment: Debian Jessie
> Reporter: Stephen Chu
> Assignee: Ismael Juma
> Priority: Critical
> Fix For: 0.9.0.0
>
>
> It seems no more clients can connect to Kafka after `max.connections.per.ip`
> is reached, even if previous clients were already disconnected.
> Using 0.8.3 (9c936b18), upon starting a fresh Kafka server that is configured
> with (max.connections.per.ip = 24), I noticed that I can cause the server to
> hit the error case of {{INFO Rejected connection from /0:0:0:0:0:0:0:1,
> address already has the configured maximum of 24 connections.}} very quickly,
> by simply looping through a bunch of simple clients against the server:
> {noformat}
> #! /bin/bash
> for i in {1..30}; do
> # either:
> nc -vz 127.0.0.1 9092;
> # or:
> ( telnet 127.0.0.1 9092; ) &
> done
> # if using telnet, kill all connected jobs now via:
> kill %{2..31}
> {noformat}
> The problem seems to be that the counter for such short-lived client
> connections aren't properly decrementing when using the
> `max.connections.per.ip` feature.
> Turning on DEBUG logs, I cannot see the log lines "Closing connection from
> xxx" on [this
> line|https://github.com/apache/kafka/blob/0.8.2/core/src/main/scala/kafka/network/SocketServer.scala#L164]
> from the first few still-under-threshold short-lived connections, but starts
> showing *after* I hit the limit per that config.
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