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https://issues.apache.org/jira/browse/HADOOP-14032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Akira Ajisaka updated HADOOP-14032:
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Fix Version/s: 2.9.0
> 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
> Fix For: 2.9.0, 2.8.1, 3.0.0-alpha4
>
> Attachments: HADOOP-14032.patch
>
>
> 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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