code: public void updateUserProfile(String firstName, String lastName,
        boolean married) {
      // Get the timestamp we'll use to set the value of the profile_updated
      // action.
      long ts = System.currentTimeMillis();
  
      // Construct the key we'll use to fetch the user.
      PartitionKey key = new PartitionKey(lastName, firstName);
  
      // Get the profile and actions entity from the composite dao.
      UserProfileActionsModel profileActionsModel = userProfileActionsDao
          .get(key);
  
      // Updating the married status is hairy since our avro compiler isn't setup
      // to compile setters for fields. We have to construct a clone through the
      // builder.
      UserProfileActionsModel updatedProfileActionsModel = UserProfileActionsModel
          .newBuilder(profileActionsModel)
          .setUserProfileModel(
              UserProfileModel
                  .newBuilder(profileActionsModel.getUserProfileModel())
                  .setMarried(married).build()).build();
      // Since maps are mutable, we can update the actions map without having to
      // go through the builder like above.
      updatedProfileActionsModel.getUserActionsModel().getActions()
          .put("profile_updated", Long.toString(ts));
  
      if (!userProfileActionsDao.put(updatedProfileActionsModel)) {
        // If put returns false, a write conflict occurred where someone else
        // updated the row between the times we did the get and put.
        System.out
            .println("Updating the user profile failed due to a write conflict");
      }
    }
docs: Update the married status of a new user record.
  
  This method demonstrates updating both a UserProfileModel and a
  UserActionsModel with a single HBase request using the composite dao. It
  performs a get/update/put operation, which is protected by the
  check_conflict field on UserProfileModel from colliding with another
  get/update/put operation.
  
  @param firstName
  The first name of the user we are updating
  @param lastName
  The last name of the user we are updating
  @param married
  True if this person is married. Otherwise false.