[jira] [Created] (ZEPPELIN-2456) Multiple scheduled tasks running on notebooks causes problem with Zeppelin UI

["Daniel Kozlowski (JIRA)" <ji...@apache.org>]

Daniel Kozlowski created ZEPPELIN-2456:
------------------------------------------

             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.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)