Daniel Kozlowski created ZEPPELIN-2456:
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Summary: Multiple scheduled tasks running on notebooks causes
problem with Zeppelin UI
Key: ZEPPELIN-2456
URL: https://issues.apache.org/jira/browse/ZEPPELIN-2456
Project: Zeppelin
Issue Type: Bug
Components: zeppelin-server
Affects Versions: 0.6.0
Reporter: Daniel Kozlowski
I created a schedule task for my notebook. This used to work fine. I had other
users having done the same with their notebooks. So, altogether we had about 20
scheduled tasks running every 1 min. Recently, the schedule tasks stopped
working. I restarted the Zeppelin service. The scheduling process started again
and ran for about 2-3 minutes. Then, it stopped again.
Here is what it's seen in zeppelin log file
{code}
ERROR [2017-04-26 10:42:00,001] ({DefaultQuartzScheduler_Worker-7}
JobRunShell.java[run]:211) - Job note.2CFV54C2H threw an unhandled Exception:
java.lang.NullPointerException
at org.apache.zeppelin.notebook.Note.runAll(Note.java:404)
at org.apache.zeppelin.notebook.Notebook$CronJob.execute(Notebook.java:642)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
at
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
ERROR [2017-04-26 10:42:00,007] ({DefaultQuartzScheduler_Worker-7}
QuartzScheduler.java[schedulerError]:2425) - Job (note.2CFV54C2H threw an
exception.
org.quartz.SchedulerException: Job threw an unhandled exception. [See nested
exception: java.lang.NullPointerException]
at org.quartz.core.JobRunShell.run(JobRunShell.java:213)
at
org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:573)
Caused by: java.lang.NullPointerException
at org.apache.zeppelin.notebook.Note.runAll(Note.java:404)
at org.apache.zeppelin.notebook.Notebook$CronJob.execute(Notebook.java:642)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
... 1 more
{code}
This now causes the issue using Zeppelin UI. It does not look to be stable. I
can log in but sometimes cannot see the notebooks. Or I can see the list of
notebooks but when selecting one the content does not display.
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