@Override
  public PeerOperationType getPeerOperationType() {
    return PeerOperationType.RECOVER_STANDBY;
  }
The procedure for replaying all the remote wals for transitting a sync replication peer from
STANDBY to DOWNGRADE_ACTIVE.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/replication/RecoverStandbyProcedure.java