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https://issues.apache.org/jira/browse/HDFS-17026?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17726473#comment-17726473
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ASF GitHub Bot commented on HDFS-17026:
---------------------------------------
hchaverri opened a new pull request, #5691:
URL: https://github.com/apache/hadoop/pull/5691
…er frequency
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### Description of PR
Changes to the NamenodeHeartbeatService to update JMX reports on a
configurable frequency or to disable JMX updates altogether, as opposed to
updating it every time the service wakes up. This will help reduce the load on
Namenodes in clusters with a high number of routers.
With these changes, we expect the NamenodeStatusReport to contain slightly
outdated Namenode information, which should not impact critical paths for
routers.
### How was this patch tested?
Added unit test on TestRouterNamenodeMonitoring#testJmxRequestFrequency that
tests the following configurations:
1. Default configuration which should update JMX every time the report is
generated.
2. Configuration with JMX updates disabled, which should never update JMX
3. Configuration with a high JMX update interval, which should not update
JMX every time the report is generated.
### For code changes:
- [X] Does the title or this PR starts with the corresponding JIRA issue id
(e.g. 'HADOOP-17799. Your PR title ...')?
- [X] Object storage: have the integration tests been executed and the
endpoint declared according to the connector-specific documentation?
- [X] If adding new dependencies to the code, are these dependencies
licensed in a way that is compatible for inclusion under [ASF
2.0](http://www.apache.org/legal/resolved.html#category-a)?
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`NOTICE-binary` files?
> 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
>
> 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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