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I have a notebook in Zeppelin containing multiple paragraphs which were running fine earlier; suddenly, after a cluster restart, it has started behaving weirdly.

The first paragraph runs fine while anything that runs afterwards says Connection Refused.

Zeppelin Connection Refused after First paragraph run

On checking the logs in $ZEPPELIN_HOME/logs folder zeppelin-interpreter-spark-root-mn.log (where mn is machine name).

 INFO [2018-02-21 21:42:43,301] ({dispatcher-event-loop-15} Logging.scala[logInfo]:54) - Removed broadcast_12_piece0 on mn5:45284 in memory (size: 88.2 KB, free: 2004.5 MB)
 INFO [2018-02-21 21:42:43,401] ({Thread-3} Logging.scala[logInfo]:54) - Invoking stop() from shutdown hook
 INFO [2018-02-21 21:42:43,412] ({Thread-3} AbstractConnector.java[doStop]:310) - Stopped Spark@7de3e842{HTTP/1.1,[http/1.1]}{0.0.0.0:4040}
 INFO [2018-02-21 21:42:43,416] ({Thread-3} Logging.scala[logInfo]:54) - Stopped Spark web UI at http://10.28.37.82:4040
 INFO [2018-02-21 21:42:43,440] ({Yarn application state monitor} Logging.scala[logInfo]:54) - Interrupting monitor thread
 INFO [2018-02-21 21:42:43,442] ({Thread-3} Logging.scala[logInfo]:54) - Shutting down all executors
 INFO [2018-02-21 21:42:43,443] ({dispatcher-event-loop-4} Logging.scala[logInfo]:54) - Asking each executor to shut down
 INFO [2018-02-21 21:42:43,447] ({Thread-3} Logging.scala[logInfo]:54) - Stopping SchedulerExtensionServices
(serviceOption=None,
 services=List(),
 started=false)
 INFO [2018-02-21 21:42:43,450] ({Thread-3} Logging.scala[logInfo]:54) - Stopped
 INFO [2018-02-21 21:42:43,454] ({dispatcher-event-loop-9} Logging.scala[logInfo]:54) - MapOutputTrackerMasterEndpoint stopped!
 INFO [2018-02-21 21:42:43,466] ({Thread-3} Logging.scala[logInfo]:54) - MemoryStore cleared
 INFO [2018-02-21 21:42:43,466] ({Thread-3} Logging.scala[logInfo]:54) - BlockManager stopped
 INFO [2018-02-21 21:42:43,467] ({Thread-3} Logging.scala[logInfo]:54) - BlockManagerMaster stopped
 INFO [2018-02-21 21:42:43,471] ({dispatcher-event-loop-0} Logging.scala[logInfo]:54) - OutputCommitCoordinator stopped!
 INFO [2018-02-21 21:42:43,472] ({Thread-3} Logging.scala[logInfo]:54) - Successfully stopped SparkContext
 INFO [2018-02-21 21:42:43,473] ({Thread-3} Logging.scala[logInfo]:54) - Shutdown hook called

So the shut down hook is getting called. I have tried to check other posts on SO (like this and this) but it didn't help. Logs are not much helpful either.

Do I need to tweak code to add additional logging to fix this problem? Has someone has already faced and resolved the same?

MichaelChirico
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simplykaran
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1 Answers1

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It turned out to be the case of bad logging. I had checked yarn logs as well but couldn't find anything. It turns out that second paragraph had a RunTimeException which wasn't clear from any of the logs, but when i tried same command on spark-shell then i Realized what the problem was and fixed the same.

Run the scala command in spark-shell then see what exception it is throwing.

simplykaran
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