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From "sandeep samudrala (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FALCON-1644) Retention : Some feed instances are never deleted by retention jobs.
Date Fri, 04 Dec 2015 17:13:11 GMT

    [ https://issues.apache.org/jira/browse/FALCON-1644?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15041784#comment-15041784
] 

sandeep samudrala commented on FALCON-1644:
-------------------------------------------

[~bvellanki]: Have left few comments on the RB. 

Also as mentioned by [~peeyushb] , I feel this would not be backward compatible to users who
would want last 'n' instances of data to be present always irrespective of feed validity .

> Retention : Some feed instances are never deleted by retention jobs.
> --------------------------------------------------------------------
>
>                 Key: FALCON-1644
>                 URL: https://issues.apache.org/jira/browse/FALCON-1644
>             Project: Falcon
>          Issue Type: Bug
>          Components: retention
>    Affects Versions: 0.8
>            Reporter: Balu Vellanki
>            Assignee: Balu Vellanki
>             Fix For: 0.9
>
>         Attachments: FALCON-1644.patch
>
>
> ​Here is a sample feed xml.
> {code}
> <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
> <feed name="rawEmailFeed" description="Raw customer email feed" xmlns="uri:falcon:feed:0.1">
>     <tags>externalSystem=USWestEmailServers</tags>
>     <groups>churnAnalysisDataPipeline</groups>
>     <frequency>hours(1)</frequency>
>     <timezone>UTC</timezone>
>     <late-arrival cut-off="hours(1)"/>
>     <clusters>
>         <cluster name="primaryCluster" type="source">
>             <validity start="2015-10-30T01:00Z" end="2015-10-30T10:00Z"/>
>             <retention limit="hours(10)" action="delete"/>
>         </cluster>
>     </clusters>
>     <locations>
>         <location type="data" path="/user/ambari-qa/falcon/demo/primary/input/enron/${YEAR}-${MONTH}-${DAY}-${HOUR}"/>
>         <location type="stats" path="/"/>
>         <location type="meta" path="/"/>
>     </locations>
>     <ACL owner="ambari-qa" group="users" permission="0x755"/>
>     <schema location="/none" provider="/none"/>
> </feed>
> {code}
> In the above example, the validity time is "the time interval when the feed is valid
on this cluster". After the validity time ends, falcon is not expected to perform any operations
on the feed. The retention job for this feed will be run from validity start time up to validity
end time, and will delete any feed instances older than 10 hours. Some instances of Feed will
never be deleted. In the above example, feed instances at between 2015-10-30T00:00Z and 2015-10-30T10:00Z
will never be deleted.
> Ideally, the retention coordinator job should run from "validity start time" up to "validity
end time + retention age limit" to ensure all instances are handled. 



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