@Override
    public void describe(final Printer out) {
        out.print("  RegionEngine: ") //
            .print("regionId=") //
            .print(this.region.getId()) //
            .print(", isLeader=") //
            .print(isLeader()) //
            .print(", leaderId=") //
            .println(getLeaderId());
    }
Minimum execution/copy unit of RheaKVStore.

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