@Override
    void blockEvicted(BlockCacheKey cacheKey, BucketEntry bucketEntry, boolean decrementBlockNumber,
      boolean evictedByEvictionProcess) {
      blockEvictCounter.incrementAndGet();
      super.blockEvicted(cacheKey, bucketEntry, decrementBlockNumber, evictedByEvictionProcess);
    }
Wait the cyclicBarrier.await() in
{@link TestBucketCacheRefCnt#testReplacingBlockAndGettingBlockConcurrently} for
{@link MyBucketCache#getBlock} and Assert completed.
hbase-server/src/test/java/org/apache/hadoop/hbase/io/hfile/bucket/TestBucketCacheRefCnt.java