Hector Sandoval Chaverri created HDFS-17026:
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Summary: 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
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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