public Builder setMemberName(final String memberName) {
      if (isBlank(memberName)) {
        throw new IllegalArgumentException(
            String.format("The %s member name must be specified.",
                "Locator"));
      }
      this.memberName = memberName;
      return this;
    }
Sets the member name of the Locator in Geode.

@param memberName a String indicating the member name of this Locator in Geode.
@return this Builder instance.
@throws IllegalArgumentException if the member name is invalid.
@see #getMemberName()
geode-core/src/main/java/org/apache/geode/distributed/LocatorLauncher.java