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https://issues.apache.org/jira/browse/OOZIE-1805?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13987732#comment-13987732
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Hari Sekhon commented on OOZIE-1805:
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I think it would be better to introduce Cron compatability mode rather than
trying to cover this with a simple offset switch. Cron follows system time and
automatically follows daylight saving changes. For example if you wanted to
schedule a report to be calculated and sent to business at 9am then that should
probably be 9am all year round regardless of whether it's daylight saving or
not.
Also, following ISC cron indexing is 0-7 where 0 or 7 both count as Sunday.
> Oozie Cron diverges from standard timezone and day behaviours
> -------------------------------------------------------------
>
> Key: OOZIE-1805
> URL: https://issues.apache.org/jira/browse/OOZIE-1805
> Project: Oozie
> Issue Type: New Feature
> Environment: CDH5
> Reporter: Hari Sekhon
>
> The addition of cron syntax in Oozie (OOZIE-1306) is a good idea but the
> implementation of the fields diverges from standard cron which seems counter
> intuitive for unix veterans.
> Taken from Cloudera's blog:
> http://blog.cloudera.com/blog/2014/04/how-to-use-cron-like-scheduling-in-apache-oozie
> 1. Executing in UTC seems like a bad idea when cron uses local time… if you
> wanted to use UTC you would do it for everything and set your servers to UTC
> timezone.
> Having to translate timezones to figure out what to enter requires more
> effort on the part of the user.
> 2. The day field offsets are wrong/needlessly different compared to ISC cron
> which is zero indexed and uses 0 or 7 for Sunday instead of starting from 1.
> These points will cause a less intuitive experience and surely some
> misconfigurations... could we realign this or would it require an upstream
> fix to the Quartz Scheduler? If the latter would it be easier to just reindex
> the days and calculate the timezone in Oozie before feeding to Quartz?
> Thanks
> Hari Sekhon
> http://www.linkedin.com/in/harisekhon
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