@Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }

    StaleNamedBlob record = (StaleNamedBlob) o;
    return accountId == record.accountId && containerId == record.containerId && Objects.equals(blobName,
        record.blobName) && Objects.equals(blobId, record.blobId) && version == record.version && deleteTs.equals(
        record.deleteTs);
  }
@return the delete timestamp from the stale record.
ambry-api/src/main/java/com/github/ambry/named/StaleNamedBlob.java