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Xiaoqiao He commented on HDFS-17026: ------------------------------------ {quote}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.{quote} Total +1 from my side. And the annotation of this code segment marks optional, but we don't improve it at all. +1 for config to disable this jmx request. {quote} // Read the stats from JMX (optional) updateJMXParameters(webAddress, report); {quote} NOTE: I have remove this request directly at first deploy DFSRouter in my practice. > 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 > > 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} -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org