@Override
  public int hashCode() {
    return new HashCodeBuilder(17, 37)
        .append(getFileName())
        .append(getBlobs())
        .append(fileMetadata)
        .append(getChecksum())
        .toHashCode();
  }
Checksum of the file for verifying integrity.
samza-core/src/main/java/org/apache/samza/storage/blobstore/index/FileIndex.java