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https://issues.apache.org/jira/browse/OOZIE-1306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13680787#comment-13680787
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Robert Kanter commented on OOZIE-1306:
--------------------------------------

It looks like Quartz Scheduler has (among other things), some utilities for 
parsing and calculating cron expressions, and is Apache Licensed.  Instead of 
re-inventing the wheel, it may make sense to use for handling some of the cron 
stuff:
http://www.quartz-scheduler.org/api/2.1.7/org/quartz/CronExpression.html
                
> add flexibility to oozie coordinator job scheduling
> ---------------------------------------------------
>
>                 Key: OOZIE-1306
>                 URL: https://issues.apache.org/jira/browse/OOZIE-1306
>             Project: Oozie
>          Issue Type: New Feature
>            Reporter: Bowen Zhang
>
> Right now, to have a job that runs everyday from 9-5pm, we need to schedule 8 
> identical daily coordinator job, each of which starts at one particular hour; 
> To have a job that runs from Monday through Friday, we need 5 identical 
> weekly jobs with different start time. And there is no way right now to 
> schedule a job to runevery first day of the month. This ticket aims to solve 
> this inconvenience. 

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