@Override
  public boolean equals(Object o) {
    if (this == o) {
      return true;
    }
    if (o == null || getClass() != o.getClass()) {
      return false;
    }
    SnapshotContext that = (SnapshotContext) o;
    return snapshotId == that.snapshotId;
  }
Unique identifier of this snapshot context and the underlying snapshot.
@return long snapshotId.
storage-api/src/java/org/apache/hadoop/hive/common/type/SnapshotContext.java