Daryn Sharp created HADOOP-14035:
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Summary: 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
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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