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https://issues.apache.org/jira/browse/HDFS-17026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17728021#comment-17728021
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Hector Sandoval Chaverri commented on HDFS-17026:
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[~hexiaoqiao] would you be able to commit the attached patch to branch-3.3?
> RBF: NamenodeHeartbeatService should update JMX report with configurable
> frequency
> ----------------------------------------------------------------------------------
>
> Key: HDFS-17026
> URL: https://issues.apache.org/jira/browse/HDFS-17026
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: rbf
> Reporter: Hector Sandoval Chaverri
> Assignee: Hector Sandoval Chaverri
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0
>
> Attachments: HDFS-17026-branch-3.3.patch
>
>
> The NamenodeHeartbeatService currently calls each of the Namenode's JMX
> endpoint every time it wakes up (default value is every 5 seconds).
> In a cluster with 40 routers, we have observed service degradation on some of
> the Namenodes, since the JMX request obtains Datanode status and blocks
> other RPC requests. However, JMX report data doesn't seem to be used for
> critical paths on the routers.
> We should configure the NamenodeHeartbeatService so it updates the JMX
> reports on a slower frequency than the Namenode states or to disable the
> reports completely.
> The class calls out the JMX request being optional even though there is no
> implementation to turn it off:
> {noformat}
> // Read the stats from JMX (optional)
> updateJMXParameters(webAddress, report);{noformat}
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