Java Path.getFileSystem方法代碼示例

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
/**
 * Make sure that client failover works when an active NN dies and the standby
 * takes over.
 */
@Test
public void testDfsClientFailover() throws IOException, URISyntaxException {
  FileSystem fs = HATestUtil.configureFailoverFs(cluster, conf);
  
  DFSTestUtil.createFile(fs, TEST_FILE,
      FILE_LENGTH_TO_VERIFY, (short)1, 1L);
  
  assertEquals(fs.getFileStatus(TEST_FILE).getLen(), FILE_LENGTH_TO_VERIFY);
  cluster.shutdownNameNode(0);
  cluster.transitionToActive(1);
  assertEquals(fs.getFileStatus(TEST_FILE).getLen(), FILE_LENGTH_TO_VERIFY);
  
  // Check that it functions even if the URL becomes canonicalized
  // to include a port number.
  Path withPort = new Path("hdfs://" +
      HATestUtil.getLogicalHostname(cluster) + ":" +
      NameNode.DEFAULT_PORT + "/" + TEST_FILE.toUri().getPath());
  FileSystem fs2 = withPort.getFileSystem(fs.getConf());
  assertTrue(fs2.exists(withPort));

  fs.close();
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
private List<Path> convertInputToPaths() throws IOException {
  List<String> inputs = args.getInput();
  List<Path> paths = new ArrayList<>(inputs.size());
  for (String input : inputs) {
    Path p = new Path(input);
    FileSystem fs = p.getFileSystem(conf);
    FileStatus fstat = fs.getFileStatus(p);
    if (fstat.isFile()) {
      paths.add(p);
    } else if (fstat.isDirectory()) {
      for (FileStatus child : fs.listStatus(p)) {
        if (child.isFile()) {
          paths.add(child.getPath());
        }
      }
    } else {
      throw new IllegalStateException("Unable to handle that which is not file nor directory: " + p);
    }
  }
  return paths;
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
/**
 * Returns a {@link OutputStream} for a file that might need 
 * compression.
 */
static OutputStream getPossiblyCompressedOutputStream(Path file, 
                                                      Configuration conf)
throws IOException {
  FileSystem fs = file.getFileSystem(conf);
  JobConf jConf = new JobConf(conf);
  if (org.apache.hadoop.mapred.FileOutputFormat.getCompressOutput(jConf)) {
    // get the codec class
    Class<? extends CompressionCodec> codecClass =
      org.apache.hadoop.mapred.FileOutputFormat
                              .getOutputCompressorClass(jConf, 
                                                        GzipCodec.class);
    // get the codec implementation
    CompressionCodec codec = ReflectionUtils.newInstance(codecClass, conf);

    // add the appropriate extension
    file = file.suffix(codec.getDefaultExtension());

    if (isCompressionEmulationEnabled(conf)) {
      FSDataOutputStream fileOut = fs.create(file, false);
      return new DataOutputStream(codec.createOutputStream(fileOut));
    }
  }
  return fs.create(file, false);
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
@Override
public void open(String filePath, CompressionCodec codeC,
    CompressionType compType) throws IOException {
  Configuration conf = new Configuration();
  Path dstPath = new Path(filePath);
  FileSystem hdfs = dstPath.getFileSystem(conf);
  open(dstPath, codeC, compType, conf, hdfs);
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
private static SequenceFile.Writer[] createWriters(Path testdir,
    Configuration conf, int srcs, Path[] src) throws IOException {
  for (int i = 0; i < srcs; ++i) {
    src[i] = new Path(testdir, Integer.toString(i + 10, 36));
  }
  SequenceFile.Writer out[] = new SequenceFile.Writer[srcs];
  for (int i = 0; i < srcs; ++i) {
    out[i] = new SequenceFile.Writer(testdir.getFileSystem(conf), conf,
        src[i], IntWritable.class, IntWritable.class);
  }
  return out;
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
@Override
@Deprecated
public void cleanupJob(JobContext context) throws IOException {
  if (hasOutputPath()) {
    Path pendingJobAttemptsPath = getPendingJobAttemptsPath();
    FileSystem fs = pendingJobAttemptsPath
        .getFileSystem(context.getConfiguration());
    fs.delete(pendingJobAttemptsPath, true);
  } else {
    LOG.warn("Output Path is null in cleanupJob()");
  }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
private void configure(JobConf conf, Path inDir, Path outDir, String input,
                       Class<? extends Mapper> map, 
                       Class<? extends Reducer> reduce) 
throws IOException {
  // set up the input file system and write input text.
  FileSystem inFs = inDir.getFileSystem(conf);
  FileSystem outFs = outDir.getFileSystem(conf);
  outFs.delete(outDir, true);
  if (!inFs.mkdirs(inDir)) {
    throw new IOException("Mkdirs failed to create " + inDir.toString());
  }
  {
    // write input into input file
    DataOutputStream file = inFs.create(new Path(inDir, "part-0"));
    file.writeBytes(input);
    file.close();
  }

  // configure the mapred Job which creates a tempfile in map.
  conf.setJobName("testmap");
  conf.setMapperClass(map);
  conf.setReducerClass(reduce);
  conf.setNumMapTasks(1);
  conf.setNumReduceTasks(0);
  FileInputFormat.setInputPaths(conf, inDir);
  FileOutputFormat.setOutputPath(conf, outDir);
  String TEST_ROOT_DIR = new Path(System.getProperty("test.build.data",
                                    "/tmp")).toString().replace(' ', '+');
  conf.set("test.build.data", TEST_ROOT_DIR);
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
/**
 * Delete a file or a directory (recursively)
 * @param filePath file or directory path
 * @param conf hadoop configuration
 * @return
 */
public static boolean delete(String filePath, Configuration conf) {
    filePath = normalizeFileName(filePath);
    try {
        Path path = new Path(filePath);
        FileSystem fs = path.getFileSystem(conf);
        fs.delete(path, true);
        return true;
    } catch (IOException e) {
        LOGGER.warn("Unable to delete file " + filePath + ": " + e.getMessage());
        return false;
    }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
private void compareFileLengths(FileStatus sourceFileStatus, Path target,
                                Configuration configuration, long targetLen)
                                throws IOException {
  final Path sourcePath = sourceFileStatus.getPath();
  FileSystem fs = sourcePath.getFileSystem(configuration);
  if (fs.getFileStatus(sourcePath).getLen() != targetLen)
    throw new IOException("Mismatch in length of source:" + sourcePath
              + " and target:" + target);
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
@Override
public void setConf(Configuration conf) {
  super.setConf(conf);
  Path rootDir;
  try {
    rootDir = FSUtils.getRootDir(conf);
    rootDir.getFileSystem(conf);
  } catch (IOException ex) {
    throw new RuntimeException(ex);
  }
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
public ChunkWriter(Path outDir, Configuration conf) throws IOException {
  this.outDir = outDir;
  fs = outDir.getFileSystem(conf);
  blocksize = conf.getInt(GRIDMIX_GEN_BLOCKSIZE, 1 << 28);
  replicas = (short) conf.getInt(GRIDMIX_GEN_REPLICATION, 3);
  maxFileBytes = conf.getLong(GRIDMIX_GEN_CHUNK, 1L << 30);
  nextDestination();
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
@Override
public List<InputSplit> getSplits(JobContext jobCtxt) throws IOException {
  final JobConf jobConf = new JobConf(jobCtxt.getConfiguration());
  final JobClient client = new JobClient(jobConf);
  ClusterStatus stat = client.getClusterStatus(true);
  int numTrackers = stat.getTaskTrackers();
  final int fileCount = jobConf.getInt(GRIDMIX_DISTCACHE_FILE_COUNT, -1);

  // Total size of distributed cache files to be generated
  final long totalSize = jobConf.getLong(GRIDMIX_DISTCACHE_BYTE_COUNT, -1);
  // Get the path of the special file
  String distCacheFileList = jobConf.get(GRIDMIX_DISTCACHE_FILE_LIST);
  if (fileCount < 0 || totalSize < 0 || distCacheFileList == null) {
    throw new RuntimeException("Invalid metadata: #files (" + fileCount
        + "), total_size (" + totalSize + "), filelisturi ("
        + distCacheFileList + ")");
  }

  Path sequenceFile = new Path(distCacheFileList);
  FileSystem fs = sequenceFile.getFileSystem(jobConf);
  FileStatus srcst = fs.getFileStatus(sequenceFile);
  // Consider the number of TTs * mapSlotsPerTracker as number of mappers.
  int numMapSlotsPerTracker = jobConf.getInt(TTConfig.TT_MAP_SLOTS, 2);
  int numSplits = numTrackers * numMapSlotsPerTracker;

  List<InputSplit> splits = new ArrayList<InputSplit>(numSplits);
  LongWritable key = new LongWritable();
  BytesWritable value = new BytesWritable();

  // Average size of data to be generated by each map task
  final long targetSize = Math.max(totalSize / numSplits,
                            DistributedCacheEmulator.AVG_BYTES_PER_MAP);
  long splitStartPosition = 0L;
  long splitEndPosition = 0L;
  long acc = 0L;
  long bytesRemaining = srcst.getLen();
  SequenceFile.Reader reader = null;
  try {
    reader = new SequenceFile.Reader(fs, sequenceFile, jobConf);
    while (reader.next(key, value)) {

      // If adding this file would put this split past the target size,
      // cut the last split and put this file in the next split.
      if (acc + key.get() > targetSize && acc != 0) {
        long splitSize = splitEndPosition - splitStartPosition;
        splits.add(new FileSplit(
            sequenceFile, splitStartPosition, splitSize, (String[])null));
        bytesRemaining -= splitSize;
        splitStartPosition = splitEndPosition;
        acc = 0L;
      }
      acc += key.get();
      splitEndPosition = reader.getPosition();
    }
  } finally {
    if (reader != null) {
      reader.close();
    }
  }
  if (bytesRemaining != 0) {
    splits.add(new FileSplit(
        sequenceFile, splitStartPosition, bytesRemaining, (String[])null));
  }

  return splits;
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
@Override
public List<InputSplit> getSplits(JobContext job) throws IOException {
  // generate splits
  List<InputSplit> splitList = new ArrayList<InputSplit>();

  for (FileStatus file: listStatus(job)) {
    if (file.isDirectory()) {
      continue;
    }
    Path path = file.getPath();
    FileSystem fs = path.getFileSystem(job.getConfiguration());
    FSDataInputStream fileIn = fs.open(path);
    LineReader in = new LineReader(fileIn, job.getConfiguration());
    int lineLen = 0;
    while(true) {
      Text lineText = new Text();
      lineLen = in.readLine(lineText);
      if(lineLen <= 0) {
      break;
      }
      Matcher m = LINE_PATTERN.matcher(lineText.toString());
      if((m != null) && m.matches()) {
        TableName tableName = TableName.valueOf(m.group(1));
        int startRow = Integer.parseInt(m.group(2));
        int rows = Integer.parseInt(m.group(3));
        int totalRows = Integer.parseInt(m.group(4));
        int clients = Integer.parseInt(m.group(5));
        boolean flushCommits = Boolean.parseBoolean(m.group(6));
        boolean writeToWAL = Boolean.parseBoolean(m.group(7));
        boolean useTags = Boolean.parseBoolean(m.group(8));
        int noOfTags = Integer.parseInt(m.group(9));

        LOG.debug("tableName=" + tableName +
                  " split["+ splitList.size() + "] " +
                  " startRow=" + startRow +
                  " rows=" + rows +
                  " totalRows=" + totalRows +
                  " clients=" + clients +
                  " flushCommits=" + flushCommits +
                  " writeToWAL=" + writeToWAL +
                  " useTags=" + useTags +
                  " noOfTags=" + noOfTags);

        PeInputSplit newSplit =
          new PeInputSplit(tableName, startRow, rows, totalRows, clients,
              flushCommits, writeToWAL, useTags, noOfTags);
        splitList.add(newSplit);
      }
    }
    in.close();
  }

  LOG.info("Total # of splits: " + splitList.size());
  return splitList;
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
Writer(Configuration conf, Option... opts) throws IOException {
  BlockSizeOption blockSizeOption =
      Options.getOption(BlockSizeOption.class, opts);
  BufferSizeOption bufferSizeOption =
      Options.getOption(BufferSizeOption.class, opts);
  ReplicationOption replicationOption =
      Options.getOption(ReplicationOption.class, opts);

  FileOption fileOption = Options.getOption(FileOption.class, opts);
  AppendIfExistsOption appendIfExistsOption = Options.getOption(
      AppendIfExistsOption.class, opts);
  StreamOption streamOption = Options.getOption(StreamOption.class, opts);

  // check consistency of options
  if ((fileOption == null) == (streamOption == null)) {
    throw new IllegalArgumentException("file or stream must be specified");
  }
  if (fileOption == null && (blockSizeOption != null ||
                             bufferSizeOption != null ||
                             replicationOption != null)) {
    throw new IllegalArgumentException("file modifier options not " +
                                       "compatible with stream");
  }

  FSDataOutputStream out;
  boolean ownStream = fileOption != null;
  if (ownStream) {
    Path p = fileOption.getValue();
    FileSystem fs;
    fs = p.getFileSystem(conf);
    int bufferSize = bufferSizeOption == null ? getBufferSize(conf) :
                     bufferSizeOption.getValue();
    short replication = replicationOption == null ?
                        fs.getDefaultReplication(p) :
                        (short) replicationOption.getValue();
    long blockSize = blockSizeOption == null ? fs.getDefaultBlockSize(p) :
                     blockSizeOption.getValue();

    if (appendIfExistsOption != null && appendIfExistsOption.getValue()
        && fs.exists(p)) {
      // Read the file and verify header details
      try (WALFile.Reader reader =
               new WALFile.Reader(conf, WALFile.Reader.file(p), new Reader.OnlyHeaderOption())){
        if (reader.getVersion() != VERSION[3]) {
          throw new VersionMismatchException(VERSION[3], reader.getVersion());
        }
        sync = reader.getSync();
      }
      out = fs.append(p, bufferSize);
      this.appendMode = true;
    } else {
      out = fs.create(p, true, bufferSize, replication, blockSize);
    }
  } else {
    out = streamOption.getValue();
  }

  init(conf, out, ownStream);
}
 

import org.apache.hadoop.fs.Path; //導入方法依賴的package包/類
protected void setOutputDirectory() throws IOException{
  String actionType = conf.get(AngelConf.ANGEL_ACTION_TYPE, AngelConf.DEFAULT_ANGEL_ACTION_TYPE);
  RunningMode runningMode = RunningMode.valueOf(conf.get(AngelConf.ANGEL_RUNNING_MODE, AngelConf.DEFAULT_ANGEL_RUNNING_MODE));
  LOG.info("running mode = " + runningMode);
  boolean deleteOnExist =
    conf.getBoolean(AngelConf.ANGEL_JOB_OUTPUT_PATH_DELETEONEXIST,
      AngelConf.DEFAULT_ANGEL_JOB_OUTPUT_PATH_DELETEONEXIST);

  String path = null;
  if (!actionType.matches("predict")) {
    path = conf.get(AngelConf.ANGEL_SAVE_MODEL_PATH);
  } else {
    path = conf.get(AngelConf.ANGEL_PREDICT_PATH);
  }

  if(path == null) {
    throw new IOException("output directory is null. you must set "
      + AngelConf.ANGEL_SAVE_MODEL_PATH + " at training mode or set "
      + AngelConf.ANGEL_PREDICT_PATH + " at predict mode");
  }
  conf.set(AngelConf.ANGEL_JOB_OUTPUT_PATH, path);

  Path outputPath = new Path(path);
  FileSystem outFs = outputPath.getFileSystem(conf);
  if (outFs.exists(outputPath)) {
    if (deleteOnExist) {
      outFs.delete(outputPath, true);
    } else {
      throw new IOException("output path " + outputPath + " already exist, please check");
    }
  }

  Path outputParentPath = outputPath.getParent();
  if (!outFs.exists(outputParentPath)) {
    LOG.info("Make dir for model output parent path: " + outputParentPath);
    if (!outFs.mkdirs(outputParentPath)) {
      throw new IOException("Failed to make dir for model output parent path: " + outputParentPath);
    }
  }

  if(runningMode == RunningMode.ANGEL_PS_WORKER) {
    String logPathStr = conf.get(AngelConf.ANGEL_LOG_PATH);
    if (logPathStr != null) {
      Path logPath = new Path(logPathStr);
      FileSystem logFs = logPath.getFileSystem(conf);
      if (logFs.exists(logPath)) {
        if (deleteOnExist) {
          logFs.delete(logPath, true);
        } else {
          throw new IOException("log path " + logPath + " already exist, please check");
        }
      }
    }
  }

  Path tmpOutputPath = HdfsUtil.generateTmpDirectory(conf, getAppId(), outputPath);

  internalStateFile = new Path(HdfsUtil.generateTmpDirectory(conf, getAppId(), outputPath), "state");

  conf.set(AngelConf.ANGEL_JOB_TMP_OUTPUT_PATH, tmpOutputPath.toString());
  LOG.info(AngelConf.ANGEL_JOB_TMP_OUTPUT_PATH + "=" + tmpOutputPath.toString());

  LOG.info("internal state file is " + internalStateFile);
  conf.set(AngelConf.ANGEL_APP_SERILIZE_STATE_FILE, internalStateFile.toString());
  
}