private void replayRemoteWAL(boolean serial) {
    addChildProcedure(new RecoverStandbyProcedure(peerId, serial));
  }
The procedure for transit current sync replication state for a synchronous replication peer.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/replication/TransitPeerSyncReplicationStateProcedure.java