@Override
  public void handshake() throws Exception {
    // do nothing
    // PipeConsensus doesn't need to do handshake, since nodes in same consensusGroup/cluster
    // usually have same configuration.
  }
if one event is successfully processed by receiver in PipeConsensus, we will remove this event
from transferBuffer in order to transfer other event.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/pipe/connector/protocol/pipeconsensus/PipeConsensusAsyncConnector.java