@Override
  public String toString() {
    return "Metadata{" + "payloadPath='" + payloadPath + '\'' + ", payloadSize='" + payloadSize + '\''
        + ", jobName='" + jobName + '\'' + ", jobId='" + jobId + '\'' + ", taskName='" + taskName + '\''
        + ", storeName='" + storeName + '\'' + '}';
  }
Metadata associated with every BlobStore request. This class is used to trace a request and to determine the
bucket/container informationof the blob.
samza-api/src/main/java/org/apache/samza/storage/blobstore/Metadata.java