@Override
  protected Set<InternalDistributedMember> getRecipients() {
    CacheDistributionAdvisor advisor = getRegion().getCacheDistributionAdvisor();
    return advisor.adviseUpdate(getEvent());
  }
Common code for both UpdateOperation and DistributedPutAllOperation.
geode-core/src/main/java/org/apache/geode/internal/cache/AbstractUpdateOperation.java