How to use

setDaemon

method

in

org.apache.hadoop.hdfs.server.datanode.VolumeScanner

VolumeScanner(Conf conf, DataNode datanode, FsVolumeReference ref) {
 this.conf = conf;
 this.datanode = datanode;
 this.metrics = datanode.getMetrics();
 this.ref = ref;
 this.volume = ref.getVolume();
 ScanResultHandler handler;
 try {
  handler = conf.resultHandler.newInstance();
 } catch (Throwable e) {
  LOG.error("unable to instantiate {}", conf.resultHandler, e);
  handler = new ScanResultHandler();
 }
 this.resultHandler = handler;
 setName("VolumeScannerThread(" + volume + ")");
 setDaemon(true);
}

VolumeScanner(Conf conf, DataNode datanode, FsVolumeReference ref) {
 this.conf = conf;
 this.datanode = datanode;
 this.ref = ref;
 this.volume = ref.getVolume();
 ScanResultHandler handler;
 try {
  handler = conf.resultHandler.newInstance();
 } catch (Throwable e) {
  LOG.error("unable to instantiate {}", conf.resultHandler, e);
  handler = new ScanResultHandler();
 }
 this.resultHandler = handler;
 setName("VolumeScannerThread(" + volume.getBasePath() + ")");
 setDaemon(true);
}

VolumeScanner(Conf conf, DataNode datanode, FsVolumeReference ref) {
 this.conf = conf;
 this.datanode = datanode;
 this.ref = ref;
 this.volume = ref.getVolume();
 ScanResultHandler handler;
 try {
  handler = conf.resultHandler.newInstance();
 } catch (Throwable e) {
  LOG.error("unable to instantiate {}", conf.resultHandler, e);
  handler = new ScanResultHandler();
 }
 this.resultHandler = handler;
 setName("VolumeScannerThread(" + volume.getBasePath() + ")");
 setDaemon(true);
}