private void reply(DistributionManager dm, ArrayList grantors, ArrayList grantorVersions,
        ArrayList grantorSerialNumbers, ArrayList nonGrantors) {
      ElderInitReplyMessage.send(this, dm, grantors, grantorVersions, grantorSerialNumbers,
          nonGrantors);
    }
Note the synchronization; we can only process one response at a time.
geode-core/src/main/java/org/apache/geode/distributed/internal/locks/ElderInitProcessor.java