Code example for ThreadFactoryBuilder

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    // create scheduler executor service that services the cleaner tasks 
    // use 2 threads to accommodate the on-demand tasks and reduce the chance of 
    // back-to-back runs 
    ThreadFactory tf =
        new ThreadFactoryBuilder().setNameFormat("Shared cache cleaner").build();
    scheduledExecutor = Executors.newScheduledThreadPool(2, tf);
    super.serviceInit(conf); 
  } 
 
  @Override 
  protected void serviceStart() throws Exception {
    if (!writeGlobalCleanerPidFile()) { 
      throw new YarnException("The global cleaner pid file already exists! " + 
          "It appears there is another CleanerService running in the cluster"); 
    } 
 
    this.metrics = CleanerMetrics.initSingleton(conf);
 
    // Start dependent services (i.e. AppChecker) 
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