private Set<InternalDistributedMember> getFixedPartitionStores(String partitionName) {
    Set<InternalDistributedMember> members =
        partitionedRegion.getRegionAdvisor().adviseFixedPartitionDataStores(partitionName);

    List<FixedPartitionAttributesImpl> allFixedPartitionAttributes =
        partitionedRegion.getFixedPartitionAttributesImpl();

    if (allFixedPartitionAttributes != null) {
      for (FixedPartitionAttributesImpl fixedPartitionAttributes : allFixedPartitionAttributes) {
        if (fixedPartitionAttributes.getPartitionName().equals(partitionName)) {
          members.add(partitionedRegion.getMyId());
        }
      }
    }
    return members;
  }
This is for FPR, for given partition, we have to return the set of datastores on which the
given partition is defined

@param partitionName name of the partition for which datastores need to be found out
geode-core/src/main/java/org/apache/geode/internal/cache/PRHARedundancyProvider.java