Daryn Sharp created HADOOP-14032:
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Summary: Reduce fair call queue priority inversion
Key: HADOOP-14032
URL: https://issues.apache.org/jira/browse/HADOOP-14032
Project: Hadoop Common
Issue Type: Sub-task
Components: ipc
Affects Versions: 2.7.0
Reporter: Daryn Sharp
Assignee: Daryn Sharp
The fcq's round robin multiplexer actually rewards abusive users. Queue
consumers scan for a call from the roving multiplexer index to the lowest prio
ring before wrapping around to the higher prio rings.
Let's take a fcq with 4 priority rings. Multiplexer shares per index are 8, 4,
2, 1.
All well behaved clients are operating in ring 0. Bad client floods the server
and drops to the lowest prio. Unfortunately the service order gives 8 shares
to the good clients, followed by 4+2+1=7 shares to the bad client.
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