@Override
  public Map<String, ReplicationGroupOffset> getOffsets(ReplicationQueueId queueId)
    throws ReplicationException {
    try (Table table = conn.getTable(tableName)) {
      return getOffsets0(table, queueId);
    } catch (IOException e) {
      throw new ReplicationException("failed to getOffsets, queueId=" + queueId, e);
    }
  }
HBase table based replication queue storage.
hbase-replication/src/main/java/org/apache/hadoop/hbase/replication/TableReplicationQueueStorage.java