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https://issues.apache.org/jira/browse/HDFS-3090?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13228987#comment-13228987
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Todd Lipcon commented on HDFS-3090:
-----------------------------------
Konstantin also pointed out that we should monitor the HTTP ports of the
NameNode externally as part of the FC health checks to make sure they're
properly responding. (especially given Jetty likes to get itself into borked
states)
> Broaden NN#monitorHealth checks
> --------------------------------
>
> Key: HDFS-3090
> URL: https://issues.apache.org/jira/browse/HDFS-3090
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 0.23.3
> Reporter: Eli Collins
>
> Currently the NN implementation of HAServiceProtocol#monitorHealth just calls
> FSNamesystem#checkAvailableResources. We should extend this method to cover
> a broader range of resources (eg HDFS-2704), but we should also extend
> NN#monitorHealth to make other unrelated health checks (eg whether all its
> important service threads are running, memory usage, etc).
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