amazon web services - UpdatePolicy in Autoscaling group not working correctly for AWS CloudFormation update -

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i using aws cloudformation launch server stack. have created launchconfig , autoscaling group uses above launchconfig. have set creationpolicy waits signals ec2 instances creating cf stack.

also, have set updatepolicy autoscaling group wait signals new instances if update cf stack more desired number of instances follows:

"updatepolicy" : {         "autoscalingrollingupdate" : {             "pausetime" : "pt10m",             "waitonresourcesignals" : "true"         }     }

according above, cf should wait signals newly launched instances (or timed out) before setting status of cf stack "update_comple".

but not working explained above. status of cf stack changes "update_comple" w/o waiting signals.

please help.


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