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https://issues.apache.org/jira/browse/MAPREDUCE-1779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12868104#action_12868104
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dhruba borthakur commented on MAPREDUCE-1779:
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Two reasons:
1. Hive actually throttles new job-submissions if the heap memory on the JT
exceeds a certain threshold.
2. It is also needed to monitor the health of the JT.
> Should we provide a way to know JobTracker's memory info from client?
> ---------------------------------------------------------------------
>
> Key: MAPREDUCE-1779
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1779
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: client, jobtracker
> Affects Versions: 0.21.0
> Reporter: Amareshwari Sriramadasu
> Priority: Blocker
> Fix For: 0.22.0
>
>
> In HADOOP-4435, in branch 0.20, getClusterStatus() method returns
> JobTracker's used memory and total memory.
> But these details are missed in new api (through MAPREDUCE-777).
> If these details are needed only for web UI, I don't think they are needed
> for client.
> So, should we provide a way to know JobTracker's memory info from client?
> If yes, an api should be added in org.apache.hadoop.mapreduce.Cluster for the
> same.
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