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From "Srikanth Sundarrajan (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FALCON-1525) Add possibility to rerun process instances by an id
Date Sat, 10 Oct 2015 12:57:05 GMT

    [ https://issues.apache.org/jira/browse/FALCON-1525?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14951819#comment-14951819
] 

Srikanth Sundarrajan commented on FALCON-1525:
----------------------------------------------

[~jakub_havlik], We felt the need for having an invariant identifier that is easy to arrive
at for a particular instance of execution and instance time seemed like a good candidate.
If we were to use any other identifier that may be generated by the system, you will need
a mechanism to resolve/figure that identifier and that seemed cumbersome. Some of us have
used vanilla Oozie in the past and have had trouble working with action-id for a coordinator,
as the relationship between action-id and time was not intuitive. Having said that FALCON-1168
will soon support a-periodic instances and time doesn't seem like a natural way to identify
instances in those cases. In near future we might be seeing non-time based instance-id (such
as revision/version) for such executions, but the approach of using an time for periodic instances
may not change any time soon.

A questions relating to your use case/application: Since you were concerned about more instances
qualifying with time being slightly off, forces me to assume that the frequency of your process/feed
may be too high (such as minutes(1)). Can you provide a bit more information about the application
and the issue you were running into to help us appreciate the problem better?

> Add possibility to rerun process instances by an id
> ---------------------------------------------------
>
>                 Key: FALCON-1525
>                 URL: https://issues.apache.org/jira/browse/FALCON-1525
>             Project: Falcon
>          Issue Type: Improvement
>          Components: client
>    Affects Versions: 0.7
>            Reporter: Jakub HavlĂ­k
>            Priority: Critical
>
> As a user I need to specifically rerun individual instances by their ids. Doing rerun
by name and time slot (where minimum resolution means minutes) is not usable in a corporate
environment. FalconClient class needs to have a rerunInstance method which accepts some unique
identifier for each instance. As it stands now there is possibility to inadvertently restart
instance if it somehow fits into a time slot (parallel instances or instances long only a
few seconds for example).



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