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https://issues.apache.org/jira/browse/HDFS-15561?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17324645#comment-17324645
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Wei-Chiu Chuang commented on HDFS-15561:
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[~fengnanli] are you taking of the PR? I'll go ahead update target version.
> Fix NullPointException when start dfsrouter
> -------------------------------------------
>
> Key: HDFS-15561
> URL: https://issues.apache.org/jira/browse/HDFS-15561
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: rbf
> Affects Versions: 3.3.0
> Reporter: Xie Lei
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.3.1
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> when start dfsrouter, it throw NPE
> {code:java}
> 2020-09-08 19:41:14,989 ERROR
> org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService:
> Unexpected exception while communicating with null:null:
> java.net.UnknownHostException: null2020-09-08 19:41:14,989 ERROR
> org.apache.hadoop.hdfs.server.federation.router.NamenodeHeartbeatService:
> Unexpected exception while communicating with null:null:
> java.net.UnknownHostException: nulljava.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 ... 14 more
> {code}
>
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