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From "Doug Cutting (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HADOOP-1900) the heartbeat and task event queries interval should be set dynamically by the JobTracker
Date Wed, 17 Oct 2007 17:55:50 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-1900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12535651
] 

Doug Cutting commented on HADOOP-1900:
--------------------------------------

> For every additional 500 nodes we increase heartbeat interval by 10 secs.

I wonder if instead we should just make it clusterSize/50+1?  That way, small clusters will
get a heartbeat of just one second, which should make them more responsive.

> the heartbeat and task event queries interval should be set dynamically by the JobTracker
> -----------------------------------------------------------------------------------------
>
>                 Key: HADOOP-1900
>                 URL: https://issues.apache.org/jira/browse/HADOOP-1900
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: mapred
>            Reporter: Owen O'Malley
>            Assignee: Owen O'Malley
>
> The JobTracker should scale the intervals that the TaskTrackers use to contact it dynamically,
based on how the busy it is and the size of the cluster.

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