public Period getMergeMinRegionAge(NormalizeContext context) {
      final int mergeMinRegionAge =
        context.getOrDefault(MERGE_MIN_REGION_AGE_DAYS_KEY, Integer::parseInt, -1);
      if (mergeMinRegionAge < 0) {
        return getMergeMinRegionAge();
      }
      return Period.ofDays(mergeMinRegionAge);
    }
Holds the configuration values read from {@link Configuration}. Encapsulation in a POJO enables
atomic hot-reloading of configs without locks.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.java