@Override
  public boolean isOpen() {
    return isOpen.get();
  }
Create an instance of PerfRSC.
@param bytes the bytes that form a chunk that will be repeatedly returned until {@code streamSize} is reached.
@param streamSize the desired total size of the stream.
ambry-tools/src/main/java/com/github/ambry/tools/perf/rest/PerfRSC.java