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From "Pallavi Rao (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FALCON-664) Enforce Validations on Update in Process/Feed Definition
Date Tue, 20 Jan 2015 05:42:34 GMT

    [ https://issues.apache.org/jira/browse/FALCON-664?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14283428#comment-14283428
] 

Pallavi Rao commented on FALCON-664:
------------------------------------

Hmm.. to make it less ambiguous, we'll have to introduce another attribute in addition to
start time. Lets say, in the initial process spec. user had this:
 <validity start="2014-01-15T00:00Z" end="2014-11-15T01:05Z"/>

Now, the user would like to update the time such that it starts at 2 am rather than 12 midnight
for future instances, he/she will change the spec. during update to:
 <validity start="2014-01-15T00:00Z" startOffset=next(0,2,0) end="2014-11-15T01:05Z"/>
The syntax being next(days, hours, minutes). If no offset attribute is specified, it is assumed
that the schedule remains unchanged, equivalent to next(0,0,0). startOffset need not be an
attribute used for update. The offset can be applied during creation too.

During process/feed updates the start time update will be disallowed if the instance is already
active. Meaning, if the original spec. had the start time in the past. If the original spec.
had the start time in the future, we can allow for updates.



> Enforce Validations on Update in Process/Feed Definition 
> ---------------------------------------------------------
>
>                 Key: FALCON-664
>                 URL: https://issues.apache.org/jira/browse/FALCON-664
>             Project: Falcon
>          Issue Type: Improvement
>            Reporter: Kisalay Ranjan
>
> Falcon should enforce Validation on update of the process/feed definition.
> This is specifically applicable for Start Times. 
> Today falcon verbatim updates already configured and deployed start time with input start
time. 
> By doing this, a user can un-intentionally update the start time to recent time, and
make all the past status of the process un-accessible through falcon.
> My understanding is that the start times are changed today to reflect the change in offset
at which the process runs (10th minute of the hour for hourly jobs or 11th hour of the day
for daily job).
> Falcon should just allow for the change in the offset and not the start time itself.



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