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https://issues.apache.org/jira/browse/HADOOP-5784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hemanth Yamijala updated HADOOP-5784:
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Release Note: Introduced a configuration parameter,
mapred.heartbeats.in.second, as an expert option, that defines how many
heartbeats a jobtracker can process in a second. Administrators can set this to
an appropriate value based on cluster size and expected processing time on the
jobtracker to achieve a balance between jobtracker scalability and latency of
jobs.
> The length of the heartbeat cycle should be configurable.
> ---------------------------------------------------------
>
> Key: HADOOP-5784
> URL: https://issues.apache.org/jira/browse/HADOOP-5784
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Owen O'Malley
> Assignee: Amareshwari Sriramadasu
> Fix For: 0.21.0
>
> Attachments: HADOOP-5784_yhadoop20.patch, patch-5784-1.txt,
> 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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