public Builder createWALDir(boolean createWALDir) {
      this.createWALDir = createWALDir;
      return this;
    }
Builder pattern for creating an {@link StartMiniClusterOption}. The default values of its
fields should be considered public and constant. Changing the default values may cause other
tests fail.
hbase-testing-util/src/main/java/org/apache/hadoop/hbase/StartMiniClusterOption.java