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https://issues.apache.org/jira/browse/HDFS-15561?focusedWorklogId=579782&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-579782
 ]

ASF GitHub Bot logged work on HDFS-15561:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 09/Apr/21 06:07
            Start Date: 09/Apr/21 06:07
    Worklog Time Spent: 10m 
      Work Description: fengnanli commented on pull request #2284:
URL: https://github.com/apache/hadoop/pull/2284#issuecomment-816434207


   @lamberken  are you still working on this issue? If not can I take it on? 
Thanks!


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Issue Time Tracking
-------------------

    Worklog Id:     (was: 579782)
    Time Spent: 40m  (was: 0.5h)

> 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: 40m
>  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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