I am trying to run a Spark Predictor using a trained Spark Linear Regression Learner, but the Spark Predictor component seems to fail every time I execute it.
This is the error that is printed from KNIME’s console:
Execute failed: akka.pattern.AskTimeoutException: Ask timed out on [Actor[akka://JobServer/user/data-manager#1019598049]] after [3000 ms]. Sender[null] sent message of type “spark.jobserver.DataManagerActor$StoreData”. (RestoredThrowable)
After inspecting /var/log/spark2-job-server/spark-job-server.log, turns out there was this exception:
ERROR ka.actor.OneForOneStrategy  [akka://JobServer/user/data-manager] - /tmp/spark2-job-server/upload/knime-sparkModel7134388612124129131.tmp-2018-07-12T14_46_39.707+07_00.dat (No such file or directory)
java.io.FileNotFoundException: /tmp/spark2-job-server/upload/knime-sparkModel7134388612124129131.tmp-2018-07-12T14_46_39.707+07_00.dat (No such file or directory)
If it helps, I also tried looking at /var/log/spark2-job-server//spark-job-server.log, but there were nothing inside the log file relating to the exception (the log just ends at “Linear Regression With SGD done” and “Job finished OK”