@Override
  protected void deserializeStateData(ProcedureStateSerializer serializer) throws IOException {
    super.deserializeStateData(serializer);
    serializer.deserialize(EnablePeerStateData.class);
  }
The procedure for enabling a replication peer.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/replication/EnablePeerProcedure.java