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https://issues.apache.org/jira/browse/HADOOP-10279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13938492#comment-13938492
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Chris Li commented on HADOOP-10279:
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Hi [~zhaoyunjiong], thanks for taking a look.
This is handled in the FairCallQueue: it treats the index from the Multiplexer
as a suggestion and works on the first non-empty queue, starting from this
suggestion. So if the Mux suggests queue 2 but queues 2, 3, and 4 are empty,
the FairCallQueue will use queue 5, or whatever queue is not empty.
This way, the Mux doesn't need to know anything about what queues are.
> Create multiplexer, a requirement for the fair queue
> ----------------------------------------------------
>
> Key: HADOOP-10279
> URL: https://issues.apache.org/jira/browse/HADOOP-10279
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Chris Li
> Attachments: subtask2_add_mux.patch
>
>
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