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Posted to common-issues@hadoop.apache.org by "Daryn Sharp (JIRA)" <ji...@apache.org> on 2017/02/03 18:58:51 UTC
[jira] [Updated] (HADOOP-14032) Reduce fair call queue priority
inversion
[ https://issues.apache.org/jira/browse/HADOOP-14032?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Daryn Sharp updated HADOOP-14032:
---------------------------------
Status: Patch Available (was: Open)
Forgot to submit...
> 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
> 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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