Region getRegion(String system, String stream) {
    String name = get(String.format(CONFIG_STREAM_REGION, system, stream),
        get(String.format(CONFIG_SYSTEM_REGION, system)));
    return Region.getRegion(Regions.fromName(name));
  }
Get the Kinesis region for the system stream
@param system name of the system
@param stream name of the stream
@return Kinesis region
samza-aws/src/main/java/org/apache/samza/system/kinesis/KinesisConfig.java