Github user bzz commented on the issue:

    https://github.com/apache/zeppelin/pull/1134
  
    CI fails with something strange, never seen before
    
    ```
    Running org.apache.zeppelin.interpreter.remote.RemoteInterpreterTest
    11:02:15,102  INFO 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterManagedProcess:114 - 
Run interpreter process 
[/home/travis/build/apache/zeppelin/zeppelin-interpreter/../bin/interpreter.sh, 
-d, fake, -p, 36543, -l, fakeRepo]
    
/home/travis/build/apache/zeppelin/zeppelin-interpreter/../bin/interpreter.sh: 
line 159: 
/home/travis/build/apache/zeppelin/run/zeppelin-interpreter-fake-travis-testing-worker-linux-docker-b27ad04a-3371-linux-4.pid:
 No such file or directory
    11:02:15,617  INFO 
org.apache.zeppelin.interpreter.remote.RemoteInterpreter:223 - Create remote 
interpreter org.apache.zeppelin.interpreter.remote.mock.MockInterpreterA
    11:02:15,876  INFO 
org.apache.zeppelin.interpreter.remote.RemoteInterpreter:223 - Create remote 
interpreter org.apache.zeppelin.interpreter.remote.mock.MockInterpreterB
    11:02:15,912 ERROR 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterEventPoller:192 - Can't 
handle event RemoteInterpreterEvent(type:OUTPUT_UPDATE, 
data:{"data":"","noteId":"note","paragraphId":"id"})
    java.lang.NullPointerException
        at 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterEventPoller.run(RemoteInterpreterEventPoller.java:174)
    11:02:15,946 ERROR 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterEventPoller:192 - Can't 
handle event RemoteInterpreterEvent(type:OUTPUT_APPEND, 
data:{"data":"","noteId":"note","paragraphId":"id"})
    java.lang.NullPointerException
        at 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterEventPoller.run(RemoteInterpreterEventPoller.java:160)
    11:02:15,956  INFO 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess:127 - shutdown 
interpreter process
    11:02:18,078  INFO 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterProcess:137 - Exception 
in RemoteInterpreterProcess while synchronized dereference, can safely ignore 
exception while client.shutdown() may terminates remote process
    11:02:18,080  INFO 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterManagedProcess:152 - 
Interpreter process exited 0
    11:02:18,580  INFO org.apache.zeppelin.interpreter.InterpreterGroup:140 - 
Close interpreter group InterpreterGroup_1467716535100_997017074
    11:02:18,590  INFO org.apache.zeppelin.interpreter.InterpreterGroup:204 - 
Destroy interpreter group InterpreterGroup_1467716535100_997017074
    11:02:18,601  INFO 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterManagedProcess:114 - 
Run interpreter process 
[/home/travis/build/apache/zeppelin/zeppelin-interpreter/../bin/interpreter.sh, 
-d, fake, -p, 47761, -l, fakeRepo]
    
/home/travis/build/apache/zeppelin/zeppelin-interpreter/../bin/interpreter.sh: 
line 159: 
/home/travis/build/apache/zeppelin/run/zeppelin-interpreter-fake-travis-testing-worker-linux-docker-b27ad04a-3371-linux-4.pid:
 No such file or directory
    11:02:19,104  INFO 
org.apache.zeppelin.interpreter.remote.RemoteInterpreter:223 - Create remote 
interpreter org.apache.zeppelin.interpreter.remote.mock.MockInterpreterA
    11:02:19,481  INFO org.apache.zeppelin.scheduler.SchedulerFactory:131 - Job 
0 started by scheduler 
org.apache.zeppelin.interpreter.remote.RemoteInterpreternote1780497356
    11:02:19,529 ERROR 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterEventPoller:192 - Can't 
handle event RemoteInterpreterEvent(type:OUTPUT_UPDATE, 
data:{"data":"","noteId":"note","paragraphId":"0"})
    java.lang.NullPointerException
        at 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterEventPoller.run(RemoteInterpreterEventPoller.java:174)
    11:02:19,573 ERROR 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterEventPoller:192 - Can't 
handle event RemoteInterpreterEvent(type:OUTPUT_APPEND, 
data:{"data":"","noteId":"note","paragraphId":"0"})
    java.lang.NullPointerException
        at 
org.apache.zeppelin.interpreter.remote.RemoteInterpreterEventPoller.run(RemoteInterpreterEventPoller.java:160)
    11:02:19,583  INFO org.apache.zeppelin.scheduler.SchedulerFactory:137 - Job 
0 finished by scheduler 
org.apache.zeppelin.interpreter.remote.RemoteInterpreternote1780497356
    ```
    
    re-triggerin, to see if it's reproducable


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