callerReference property
A unique number that ensures that the request can't be replayed. If the
CallerReference is new (no matter the content of the
StreamingDistributionConfig object), a new streaming
distribution is created. If the CallerReference is a value that
you already sent in a previous request to create a streaming distribution,
and the content of the StreamingDistributionConfig is identical
to the original request (ignoring white space), the response includes the
same information returned to the original request. If the
CallerReference is a value that you already sent in a previous
request to create a streaming distribution but the content of the
StreamingDistributionConfig is different from the original
request, CloudFront returns a DistributionAlreadyExists error.
Implementation
final String callerReference;