lamber-ken opened a new pull request #2284:
URL: https://github.com/apache/hadoop/pull/2284
## NOTICE
`dfs.federation.router.monitor.localnamenode.enable` is true by default,
but it always add it to namenode heartbeat service, so the log file is full
of exception information.
```
java.lang.IllegalArgumentException: java.net.UnknownHostException: null
at
org.apache.hadoop.security.SecurityUtil.buildTokenService(SecurityUtil.java:447)
at
org.apache.hadoop.hdfs.NameNodeProxies.createNonHAProxy(NameNodeProxies.java:171)
at
org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:123)
at
org.apache.hadoop.hdfs.NameNodeProxies.createProxy(NameNodeProxies.java:95)
at
org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService.getNamenodeStatusReport(NamenodeHeartbeatService.java:248)
at
org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService.updateState(NamenodeHeartbeatService.java:205)
at
org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService.periodicInvoke(NamenodeHeartbeatService.java:159)
at
org.apache.hadoop.hdfs.server.federation.router.PeriodicService$1.run(PeriodicService.java:178)
at
java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:514)
at
java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
at
java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:300)
at
java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at
java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.net.UnknownHostException: null
```
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