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https://issues.apache.org/jira/browse/HADOOP-12922?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoyu Yao resolved HADOOP-12922.
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Resolution: Duplicate
This is covered in HADOOP-12916.
> Separate Scheduler from FCQ
> ---------------------------
>
> Key: HADOOP-12922
> URL: https://issues.apache.org/jira/browse/HADOOP-12922
> Project: Hadoop Common
> Issue Type: Sub-task
> Components: ipc
> Reporter: Xiaoyu Yao
> Assignee: Xiaoyu Yao
>
> Currently, {{CallQueueManager}} has a reference to FCQ which owns scheduler,
> call queue and multiplexer. It will make it easier to develop new call
> queues if scheduler and multiplexer can be made pluggable for reuse.
>
> This ticket is opened to define a separate scheduler interface so that
> 1) different schedulers can be plugged in while using FCQ.
> 2) scheduler related metrics can be easily added for monitoring and trouble
> shooting.
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