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https://issues.apache.org/jira/browse/HADOOP-5784?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12707966#action_12707966
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Steve Loughran commented on HADOOP-5784:
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is the goal here to detect failures of data nodes, or to have an up to date
track of which task trackers have capacity?
> 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
>
> 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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