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I believe, you'd have already gone through this re:Post Thread, if not, please take a look at it and see if this relates to your case as well.
Comment here if you have additional questions, happy to help
Abhishek

the answer not related to above thread , after i run the job ,it failed after 7 Min with error "Communications link failure"
Oh I see. It could be the issue related to data. However I would suggest you to log AWS Support case under Technical category.