@Override
    public String toString() {
        return "Instruction{" + "region=" + region + ", changePeer=" + changePeer + ", transferLeader="
               + transferLeader + ", rangeSplit=" + rangeSplit + '}';
    }
Instruction of the placement driver server.

@author jiachun.fjc
jraft-rheakv/rheakv-core/src/main/java/com/alipay/sofa/jraft/rhea/metadata/Instruction.java