Pietro Pugni created ZEPPELIN-2515:
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Summary: spark.r interpreter becomes unresponsive after some time
and R process quits silently
Key: ZEPPELIN-2515
URL: https://issues.apache.org/jira/browse/ZEPPELIN-2515
Project: Zeppelin
Issue Type: Bug
Components: Interpreters, r-interpreter
Affects Versions: 0.7.1, 0.7.0
Environment: Ubuntu 16.04.2 LTS Server
Reporter: Pietro Pugni
On Zeppelin 0.7.1 R process quits/crash/gets killed but Spark session remain
active, so %spark.r interpreter needs to be restarted. On 0.7.0 sometimes
restarting the interpreter doesn't work, so Zeppelin requires a full restart.
These are the steps I followed to produce this behaviour:
1) Enable log4j debug properties.
2) Start a brand new instance of zeppelin issuing:
service zeppelin start
3) Open an existing notebook or create a new one and execute this block of code:
%spark.r
2+2
4) Wait for 3) to finish and close the browser. The zeppelin log should report
something like this:
INFO [2017-05-08 12:26:15,879] ({qtp423031029-60}
NotebookServer.java[onClose]:363) - Closed connection to 127.0.0.1 : 33798.
(1001) null
5) Wait several minutes without using zeppelin and without reconnecting via
browser and at a certain point R will quit. The interpreter log file should
contain something similar to these lines:
DEBUG [2017-05-08 13:08:00,187] ({Exec Stream Pumper}
InterpreterOutputStream.java[processLine]:72) - Interpreter output:Error in
handleErrors(returnStatus, conn) :
DEBUG [2017-05-08 13:08:00,188] ({Exec Stream Pumper}
InterpreterOutputStream.java[processLine]:72) - Interpreter output: No status
is returned. Java SparkR backend might have failed.
DEBUG [2017-05-08 13:08:00,188] ({Exec Stream Pumper}
InterpreterOutputStream.java[processLine]:72) - Interpreter output:Calls:
<Anonymous> -> invokeJava -> handleErrors
DEBUG [2017-05-08 13:08:00,188] ({Exec Stream Pumper}
InterpreterOutputStream.java[processLine]:72) - Interpreter output:Execution
halted
This issue has been discussed here:
https://lists.apache.org/thread.html/17d8bbea0b755a9cf866a6d78909493d63b09bfa92a477bc0e28bc1c@%3Cusers.zeppelin.apache.org%3E
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