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https://issues.apache.org/jira/browse/KAFKA-665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13619914#comment-13619914
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David Arthur commented on KAFKA-665:
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Maybe RequestChannel.sendRequest and RequestChannel.requestQueue should have a
timeout instead of blocking forever?
> Outgoing responses delayed on a busy Kafka broker
> --------------------------------------------------
>
> Key: KAFKA-665
> URL: https://issues.apache.org/jira/browse/KAFKA-665
> Project: Kafka
> Issue Type: Bug
> Affects Versions: 0.8
> Reporter: Neha Narkhede
> Priority: Critical
> Labels: replication-performance
> Fix For: 0.8
>
>
> In a long running test, I observed that after a few hours of operation, few
> requests start timing out, mainly because they spent very long time sitting
> in the response queue -
> [2012-12-07 22:05:56,670] TRACE Completed request with correlation id 3965966
> and client : TopicMetadataRequest:4009, queueTime:1, localTime:28,
> remoteTime:0, sendTime:3980 (kafka.network.RequestChannel$)
> [2012-12-07 22:04:12,046] TRACE Completed request with correlation id 3962561
> and client : TopicMetadataRequest:3449, queueTime:0, localTime:29,
> remoteTime:0, sendTime:3420 (kafka.network.RequestChannel$)
> [2012-12-07 22:05:56,670] TRACE Completed request with correlation id 3965966
> and client : TopicMetadataRequest:4009, queueTime:1, localTime:28,
> remoteTime:0, sendTime:3980 (kafka.network.RequestChannel$)
> We might have a problem in the way we process outgoing responses. Basically,
> if the processor thread blocks on enqueuing requests in the request queue, it
> doesn't come around to processing its responses which are ready to go out.
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