private void populateKeySet(String whichKey) {
    for (int i = 0; i < NO_OF_PUTS_BEFORE_GII; i++) {
      keys_set_before_gii.add(whichKey + i);
    }

  }
This function creates regionqueue on 4 VMs
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/ha/HAGIIBugDUnitTest.java