@Override
  public boolean isEmpty() {
    // TODO: query destination stats in start method
    return false;
  }
Create {@link MessageInfo} object from {@link CloudBlobMetadata} object.
@param metadata {@link CloudBlobMetadata} object.
@return {@link MessageInfo} object.
@throws IOException
ambry-cloud/src/main/java/com/github/ambry/cloud/CloudBlobStore.java