private boolean isValidStreamId(String id) {
    return StringUtils.isNotBlank(id) && STREAM_ID_PATTERN.matcher(id).matches();
  }
Additional system-specific properties for this stream.
<p>
These properties are added under the {@code streams.stream-id.*} scope.

@param streamConfigs system-specific properties for this stream
@return this stream descriptor
samza-api/src/main/java/org/apache/samza/system/descriptors/StreamDescriptor.java