How to use

org.apache.hadoop.hdfs.server.datanode.BlockScanner

constructor

  new TracerConfigurationManager(DATANODE_HTRACE_PREFIX, conf);
this.fileIoProvider = new FileIoProvider(conf, this);
this.blockScanner = new BlockScanner(this);
this.lastDiskErrorCheck = 0;
this.maxNumberOfBlocksToLog = conf.getLong(DFS_MAX_NUM_BLOCKS_TO_LOG_KEY,

/**
 * Creates a dummy DataNode for testing purpose.
 */
@VisibleForTesting
@InterfaceAudience.LimitedPrivate("HDFS")
DataNode(final Configuration conf) throws DiskErrorException {
 super(conf);
 this.tracer = createTracer(conf);
 this.tracerConfigurationManager =
   new TracerConfigurationManager(DATANODE_HTRACE_PREFIX, conf);
 this.fileIoProvider = new FileIoProvider(conf, this);
 this.fileDescriptorPassingDisabledReason = null;
 this.maxNumberOfBlocksToLog = 0;
 this.confVersion = null;
 this.usersWithLocalPathAccess = null;
 this.connectToDnViaHostname = false;
 this.blockScanner = new BlockScanner(this, this.getConf());
 this.pipelineSupportECN = false;
 this.socketFactory = NetUtils.getDefaultSocketFactory(conf);
 this.dnConf = new DNConf(this);
 initOOBTimeout();
 storageLocationChecker = null;
 volumeChecker = new DatasetVolumeChecker(conf, new Timer());
}

/**
 * Creates a dummy DataNode for testing purpose.
 */
@VisibleForTesting
@InterfaceAudience.LimitedPrivate("HDFS")
DataNode(final Configuration conf) {
 super(conf);
 this.blockScanner = new BlockScanner(this, conf);
 this.fileDescriptorPassingDisabledReason = null;
 this.maxNumberOfBlocksToLog = 0;
 this.confVersion = null;
 this.usersWithLocalPathAccess = null;
 this.connectToDnViaHostname = false;
 this.getHdfsBlockLocationsEnabled = false;
 this.pipelineSupportECN = false;
}

/**
 * Creates a dummy DataNode for testing purpose.
 */
@VisibleForTesting
@InterfaceAudience.LimitedPrivate("HDFS")
DataNode(final Configuration conf) {
 super(conf);
 this.blockScanner = new BlockScanner(this, conf);
 this.fileDescriptorPassingDisabledReason = null;
 this.maxNumberOfBlocksToLog = 0;
 this.confVersion = null;
 this.usersWithLocalPathAccess = null;
 this.connectToDnViaHostname = false;
 this.getHdfsBlockLocationsEnabled = false;
 this.pipelineSupportECN = false;
}

    final SecureResources resources) throws IOException {
super(conf);
this.blockScanner = new BlockScanner(this, conf);
this.lastDiskErrorCheck = 0;
this.maxNumberOfBlocksToLog = conf.getLong(DFS_MAX_NUM_BLOCKS_TO_LOG_KEY,

@Before
public void setUp() {
 dataset = mock(FsDatasetImpl.class);
 baseDir = new FileSystemTestHelper().getTestRootDir();
 Configuration blockScannerConf = new Configuration();
 blockScannerConf.setInt(DFSConfigKeys.
   DFS_DATANODE_SCAN_PERIOD_HOURS_KEY, -1);
 blockScanner = new BlockScanner(null, blockScannerConf);
}

    final SecureResources resources) throws IOException {
super(conf);
this.blockScanner = new BlockScanner(this, conf);
this.lastDiskErrorCheck = 0;
this.maxNumberOfBlocksToLog = conf.getLong(DFS_MAX_NUM_BLOCKS_TO_LOG_KEY,

@Before
public void setUp() throws IOException {
 datanode = mock(DataNode.class);
 storage = mock(DataStorage.class);
 this.conf = new Configuration();
 this.conf.setLong(DFS_DATANODE_SCAN_PERIOD_HOURS_KEY, 0);
 final DNConf dnConf = new DNConf(conf);
 when(datanode.getConf()).thenReturn(conf);
 when(datanode.getDnConf()).thenReturn(dnConf);
 final BlockScanner disabledBlockScanner = new BlockScanner(datanode, conf);
 when(datanode.getBlockScanner()).thenReturn(disabledBlockScanner);
 final ShortCircuitRegistry shortCircuitRegistry =
   new ShortCircuitRegistry(conf);
 when(datanode.getShortCircuitRegistry()).thenReturn(shortCircuitRegistry);
 createStorageDirs(storage, conf, NUM_INIT_VOLUMES);
 dataset = new FsDatasetImpl(datanode, storage, conf);
 for (String bpid : BLOCK_POOL_IDS) {
  dataset.addBlockPool(bpid, conf);
 }
 assertEquals(NUM_INIT_VOLUMES, dataset.getVolumes().size());
 assertEquals(0, dataset.getNumFailedVolumes());
}

  new RoundRobinVolumeChoosingPolicy<>();
conf.setLong(DFSConfigKeys.DFS_DATANODE_SCAN_PERIOD_HOURS_KEY, -1);
final BlockScanner blockScanner = new BlockScanner(datanode, conf);
final FsVolumeList volumeList = new FsVolumeList(
  Collections.<VolumeFailureInfo>emptyList(), blockScanner, blockChooser);