private void instantiateWriterThreads() {
    final String threadName = Thread.currentThread().getName();
    for (int i = 0; i < this.writerThreads.length; ++i) {
      this.writerThreads[i] = new WriterThread(this.writerQueues.get(i));
      this.writerThreads[i].setName(threadName + "-BucketCacheWriter-" + i);
      this.writerThreads[i].setDaemon(true);
    }
  }
Called by the constructor to instantiate the writer threads.
hbase-server/src/main/java/org/apache/hadoop/hbase/io/hfile/bucket/BucketCache.java