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https://issues.apache.org/jira/browse/HADOOP-14035?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16038897#comment-16038897
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Kihwal Lee commented on HADOOP-14035:
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HADOOP-14440 allows tracking the number of dropped connections by IPC Server.
> Reduce fair call queue backoff's impact on clients
> --------------------------------------------------
>
> Key: HADOOP-14035
> URL: https://issues.apache.org/jira/browse/HADOOP-14035
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: ipc
> Affects Versions: 2.7.0
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HADOOP-14035.patch
>
>
> When fcq backoff is enabled and an abusive client overflows the call queue,
> its connection is closed, as well as subsequent good client connections.
> Disconnects are very disruptive, esp. to multi-threaded clients with multiple
> outstanding requests, or clients w/o a retry proxy (ex. datanodes).
> Until the abusive user is downgraded to a lower priority queue,
> disconnect/reconnect mayhem occurs which significantly degrades performance.
> Server metrics look good despite horrible client latency.
> The fcq should utilize selective ipc disconnects to avoid pushback
> disconnecting good clients.
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