$ java -version java version "1.8.0_171" Java(TM) SE Runtime Environment (build 1.8.0_171-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.171-b11, mixed mode)
1) I have upgrade Java only for namenodes, after the upgrade i'm getting the concering health of NodeManager? Like DNS Resolution, Web server status, RPC Latency Error:
The moving average of the RPC latency was 10.8 second(s) ms over the previous 5 minute(s). The moving average of the queue time was 0 second(s) ms. The moving average of the processing time was 10.8 second(s) ms. Critical threshold: 5 second(s).
The hostname and canonical name for this host are consistent when checked from a Java process. The most recent DNS resolution took 13.2 second(s). Warning threshold: 1 second(s).
Web Server Status:
The web server of this role was responding with metrics. The most recent collection took 15.6 second(s). Warning threshold: 10 second(s).