@Override
  public Set getBucketKeys(LocalRegion localRegion, int bucketId, boolean allowTombstones) {
    PartitionedRegion pr = (PartitionedRegion) localRegion;
    /*
     * txtodo: what does this mean for c/s
     */
    return pr.getBucketKeys(bucketId, allowTombstones);
  }
Get or create a TXRegionStub for the given region. For regions that are new to the tx, we
validate their eligibility.

@param region The region to involve in the tx.
@return existing or new stub for region
geode-core/src/main/java/org/apache/geode/internal/cache/TXStateStub.java