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https://issues.apache.org/jira/browse/HDFS-17026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17726833#comment-17726833
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ASF GitHub Bot commented on HDFS-17026:
---------------------------------------

hadoop-yetus commented on PR #5691:
URL: https://github.com/apache/hadoop/pull/5691#issuecomment-1565630817

   :confetti_ball: **+1 overall**
   
   
   
   
   
   
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   | GITHUB PR | https://github.com/apache/hadoop/pull/5691 |
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> 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
>            Priority: Major
>              Labels: pull-request-available
>
> TheĀ 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 
> theĀ  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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