Xiaoyu Yao created HDFS-8179:
--------------------------------

             Summary: DFSClient#getServerDefaults returns within 1 hour of NN 
start
                 Key: HDFS-8179
                 URL: https://issues.apache.org/jira/browse/HDFS-8179
             Project: Hadoop HDFS
          Issue Type: Bug
            Reporter: Xiaoyu Yao
            Assignee: Xiaoyu Yao


We recently hit NPE during Ambari Oozie service check. The failed hdfs command 
is below. It repros sometimes and then go away after the cluster runs for a 
while.
{code}
[ambari-qa@c6401 ~]$ hadoop --config /etc/hadoop/conf fs -rm -r 
/user/ambari-qa/mapredsmokeoutput
rm: Failed to get server trash configuration: null. Consider using -skipTrash 
option
{code}

With additional tracing, the failure was located to the following stack.
{code}
15/04/17 20:57:12 DEBUG fs.Trash: Failed to get server trash configuration
java.lang.NullPointerException
        at org.apache.hadoop.fs.Trash.moveToAppropriateTrash(Trash.java:86)
        at org.apache.hadoop.fs.shell.Delete$Rm.moveToTrash(Delete.java:117)
        at org.apache.hadoop.fs.shell.Delete$Rm.processPath(Delete.java:104)
        at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:321)
        at 
org.apache.hadoop.fs.shell.Command.processPathArgument(Command.java:293)
        at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:275)
        at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:259)
        at 
org.apache.hadoop.fs.shell.Command.processRawArguments(Command.java:205)
        at org.apache.hadoop.fs.shell.Command.run(Command.java:166)
        at org.apache.hadoop.fs.FsShell.run(FsShell.java:287)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:84)
        at org.apache.hadoop.fs.FsShell.main(FsShell.java:340)
rm: Failed to get server trash configuration: null. Consider using -skipTrash 
option
{code}






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