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https://issues.apache.org/jira/browse/WHIRR-63?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13055571#comment-13055571
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Adrian Cole commented on WHIRR-63:
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if you choose templateBuilder.fastest() using the aws-ec2 provider, a cluster
compute instance will be used and setup placement group automatically.
if you want to specify placementgroup manually use
AWSEC2TemplateOptions.placementGroup
> Support EC2 Cluster Compute Groups for Hadoop
> ---------------------------------------------
>
> Key: WHIRR-63
> URL: https://issues.apache.org/jira/browse/WHIRR-63
> Project: Whirr
> Issue Type: New Feature
> Components: service/hadoop
> Reporter: Tom White
>
> We should support the new EC2 cluster compute groups which have high
> bandwidth between nodes in the cluster. See
> http://docs.amazonwebservices.com/AWSEC2/latest/DeveloperGuide/index.html?using_cluster_computing.html
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