@Override
  public Map<String, UUID> selectDigest(String keyPrefix, Predicate<String> keyFilter) {
    return store.selectDigest(keyPrefix, keyFilter);
  }
A property map store using a pull-thru cache.
<p>
Before a map is returned, a check against the stored corresponding digest is performed to avoid
using stale data.
</p>
standalone-metastore/metastore-common/src/main/java/org/apache/hadoop/hive/metastore/properties/CachingPropertyStore.java