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https://issues.apache.org/jira/browse/MAPREDUCE-1779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12866491#action_12866491
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Amareshwari Sriramadasu commented on MAPREDUCE-1779:
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bq. Does this mean that the webUi will not show the JT memory usage anymore?
No. Web UI will continue to show memory usage. Since JobTracker is the one
serving web ui, It need not pass memory info through getClusterStatus() api.
bq. There are applications that are using this information currently exposed
via the ClusterStatus API?
I think we should add another api like getJTMemoryInfo() to retrieve the
information from Applications. Memory info can not be added to
getClusterStatus() because
* it is not cluster info.
* getClusterStatus() is synchronized and we cannot introduce jni calls into
this. See MAPREDUCE-1683.
> 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
> 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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