public boolean evictBlockIfNoRpcReferenced(BlockCacheKey blockCacheKey) {
    BucketEntry bucketEntry = backingMap.get(blockCacheKey);
    if (bucketEntry == null) {
      return false;
    }
    return evictBucketEntryIfNoRpcReferenced(blockCacheKey, bucketEntry);
  }
NOTE: This method is only for test.
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java