Github user kjmrknsn commented on the issue:
https://github.com/apache/zeppelin/pull/2687
@felixcheung
> so if someone has a lot of notebook scheduled and running (from such
schedule) at the same time, would it also cause quartz to run out of thread?
Yes, but I think jobs are queued and they will be executed when one of the
quartz threads finish the current job.
Zeppelin administrators can change the number of the quartz threads whose
default value is 10 by deploying the
[quartz.properties](https://github.com/quartz-scheduler/quartz/blob/master/quartz-core/src/main/resources/org/quartz/quartz.properties)
file on the Zeppelin classpath.
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