Map<PartitionId, List<MessageInfo>> getMissingInfos(Map<PartitionId, List<MessageInfo>> other) throws Exception {
    return getMissingInfos(other, null);
  }
Gets the message infos that are present in this host but missing in {@code other}.
@param other the list of {@link MessageInfo} to check against.
@return the message infos that are present in this host but missing in {@code other}.
ambry-replication/src/test/java/com/github/ambry/replication/MockHost.java