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outdated Namenode information, which should not impact critical paths for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)?
- [X] If applicable, have you updated the `LICENSE`, `LICENSE-binary`,
`NOTICE-binary` files?
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