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https://issues.apache.org/jira/browse/SQOOP-1168?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14251135#comment-14251135
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Veena Basavaraj commented on SQOOP-1168:
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[~gwenshap]

>>>Extra clarification about use of COUNTER:
I prefer doing the right thing, than the easy thing.  If submission is the 
place we want to store it seems apt, BTW the right thing is as not that hard 
either, adding a table and extending the current table to support more types is 
not that hard, I have done many changes in the repo so far so I speak from that 
experience.:). the wiki explains the details of the change 

>>n this case, what's the plan on validating that the inputs for "from" and 
>>"to" connectors are consistent? 

I am not sure what consistent means? The connectors have a api in initializer 
that says if they support delta fetch / merge.

[~jarcec] and I were discussing this offline, so will repeat the same here
There are few things that can happen

create job -f 1 -t 2
f and t both dont support, all good, since there wont be any such configs 
displayed

f supports delta and t supports delta, all good 

For the following two
f supports delta and t does not, 
f does not support, but t does. 

we can do upfront check and do not display the delta configs at all, not that 
hard to do ( that I prefer )

or we can be more flexible and say if the t supports delta, then lets its ok.

very similar to schema matching, where the rules have been defined based on the 
current assumptions that LocationMatcher takes precedence over Name matching.




> Sqoop2: Delta Fetch/ Merge ( formerly called Incremental Import )
> -----------------------------------------------------------------
>
>                 Key: SQOOP-1168
>                 URL: https://issues.apache.org/jira/browse/SQOOP-1168
>             Project: Sqoop
>          Issue Type: Bug
>            Reporter: Hari Shreedharan
>            Assignee: Veena Basavaraj
>             Fix For: 1.99.5
>
>
> The formal design wiki is here 
> https://cwiki.apache.org/confluence/display/SQOOP/Delta+Fetch+and+Merge+Design



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