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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