public Set<Integer> getAllLocalBucketIds() {
    return Collections.unmodifiableSet(localBucket2RegionMap.keySet());
  }
Return a set of local buckets. Iterators may include entries with null values (but non-null
keys).

@return an unmodifiable set of Map.Entry objects
geode-core/src/main/java/org/apache/geode/internal/cache/PartitionedRegionDataStore.java