@Override
        public String toString() {
            StringBuilder builder = new StringBuilder();
            if (futureReplicaLogDir != null) {
                builder.append("(currentReplicaLogDir=")
                    .append(currentReplicaLogDir)
                    .append(", futureReplicaLogDir=")
                    .append(futureReplicaLogDir)
                    .append(", futureReplicaOffsetLag=")
                    .append(futureReplicaOffsetLag)
                    .append(")");
            } else {
                builder.append("ReplicaLogDirInfo(currentReplicaLogDir=").append(currentReplicaLogDir).append(")");
            }
            return builder.toString();
        }
The LEO of the replica - LEO of the future log of this replica in the destination log directory.
-1 if either there is not replica for this partition or the replica of this partition is not being moved to another log directory on the given broker.
clients/src/main/java/org/apache/kafka/clients/admin/DescribeReplicaLogDirsResult.java