void access(long accessCounter) {
    this.accessCounter = accessCounter;
    if (this.priority == BlockPriority.SINGLE) {
      this.priority = BlockPriority.MULTI;
    }
  }
Block has been accessed. Update its local access counter.
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketEntry.java