private void verifyDiskRegionRVV() {
    DiskStoreID P_ID = getMemberID(P);
    R.invoke(() -> {
      LocalRegion lr = (LocalRegion) getCache().getRegion(REGION_NAME);
      RegionVersionVector drRVV = lr.getDiskRegion().getRegionVersionVector();
      assertEquals(0, drRVV.getExceptionCount(P_ID));
    });
  }
P, R has key1 unchanged, make one unfinished operation on R to trigger delta gii.
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/GIIDeltaDUnitTest.java