@Override
    void membershipVersionChanged() {
      super.membershipVersionChanged();
      previousVersionOperationThreads.putAll(currentVersionOperationThreads);
      currentVersionOperationThreads.clear();
    }
for debugging stalled state-flush operations we track threads performing operations
and capture the state when startOperation is invoked
geode-core/src/main/java/org/apache/geode/distributed/internal/DistributionAdvisor.java