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https://issues.apache.org/jira/browse/HADOOP-5784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713438#action_12713438
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Owen O'Malley commented on HADOOP-5784:
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This looks good, but I wish there was a good way to set up a test case. I guess 
the best way would be to create a JobTracker and call the heartbeat method and 
observe the requested heartbeat interval.

> The length of the heartbeat cycle should be configurable.
> ---------------------------------------------------------
>
>                 Key: HADOOP-5784
>                 URL: https://issues.apache.org/jira/browse/HADOOP-5784
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Owen O'Malley
>            Assignee: Amareshwari Sriramadasu
>             Fix For: 0.21.0
>
>         Attachments: patch-5784.txt
>
>
> Currently, the hearbeat cycle is set to (# nodes / 100) in seconds. This can 
> be too long for clusters that need to run low latency jobs. We should make 
> the number of heartbeats that should arrive a second configurable.

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