private void loadRegion() {
    Region<Integer, byte[]> region = cacheRule.getCache().getRegion(REGION_NAME);
    for (int i = 1; i <= ENTRIES_IN_REGION; i++) {
      region.put(i, new byte[BYTES_SIZE]);
    }
  }
Load the region with some data
geode-core/src/distributedTest/java/org/apache/geode/internal/cache/partitioned/BucketRebalanceStatRegressionTest.java