@Override
        public String transform(Map.Entry<PersistentMemberID, Set<Integer>> entry) {
          PersistentMemberID memberId = entry.getKey();
          Set<Integer> bucketIds = entry.getValue();
          StringBuilder builder = new StringBuilder();
          builder.append(persistentMemberIdToLogEntryTransformer.transform(memberId));

          if (null != bucketIds) {
            builder.append("  Buckets: ");
            builder.append(bucketIds);
          }

          builder.append("\n");

          return builder.toString();
        }
Transforms PersistentMemberIDs to a user friendly log entry.
geode-core/src/main/java/org/apache/geode/internal/util/TransformUtils.java