The official bucket format is "<region>.elasticmapreduce", so if you're using the us-east-1 region, you should use the bucket "us-east-1.elasticmapreduce".
Version: (assembly version)
public ResizeJobFlowStep( String bucket )
The Amazon S3 bucket from which to load resources.
Supported in: 4.5, 4.0, 3.5
.NET for Windows Store apps:
Supported in: Windows 8