public static PipeDataNodeTaskAgent task() {
    return PipeDataNodeAgentHolder.HANDLE.pipeDataNodeTaskAgent;
  }
Get the singleton instance of {@link PipeDataNodeTaskAgent}.

@return the singleton instance of {@link PipeDataNodeTaskAgent}
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/pipe/agent/PipeDataNodeAgent.java