Package org.apache.hadoop.fs

Examples of org.apache.hadoop.fs.FileContext

While URI names are very flexible, it requires knowing the name or address of the server. For convenience one often wants to access the default system in one's environment without knowing its name/address. This has an additional benefit that it allows one to change one's default fs (e.g. admin moves application from cluster1 to cluster2).

To facilitate this, Hadoop supports a notion of a default file system. The user can set his default file system, although this is typically set up for you in your environment via your default config. A default file system implies a default scheme and authority; slash-relative names (such as /for/bar) are resolved relative to that default FS. Similarly a user can also have working-directory-relative names (i.e. names not starting with a slash). While the working directory is generally in the same default FS, the wd can be in a different FS.

Hence Hadoop path names can be one of:

Relative paths with scheme (scheme:foo/bar) are illegal.

****The Role of the FileContext and configuration defaults****

The FileContext provides file namespace context for resolving file names; it also contains the umask for permissions, In that sense it is like the per-process file-related state in Unix system. These two properties

in general, are obtained from the default configuration file in your environment, (@see {@link Configuration}). No other configuration parameters are obtained from the default config as far as the file context layer is concerned. All file system instances (i.e. deployments of file systems) have default properties; we call these server side (SS) defaults. Operation like create allow one to select many properties: either pass them in as explicit parameters or use the SS properties.

The file system related SS defaults are

*** Usage Model for the FileContext class ***

Example 1: use the default config read from the $HADOOP_CONFIG/core.xml. Unspecified values come from core-defaults.xml in the release jar.

Example 2: Get a FileContext with a specific URI as the default FS Example 3: FileContext with local file system as the default Example 4: Use a specific config, ignoring $HADOOP_CONFIG Generally you should not need use a config unless you are doing

  }

  @Override
  public Configuration loadConfFile() throws IOException {
    Path confPath = getConfFile();
    FileContext fc = FileContext.getFileContext(confPath.toUri(), conf);
    Configuration jobConf = new Configuration(false);
    jobConf.addResource(fc.open(confPath), confPath.toString());
    return jobConf;
  }
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   */
  @Test
  public void testSaveNamespace() throws IOException {
    MiniDFSCluster cluster = null;
    DistributedFileSystem fs = null;
    FileContext fc;
    try {
      Configuration conf = new HdfsConfiguration();
      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes).format(true).build();
      cluster.waitActive();
      fs = (cluster.getFileSystem());
      fc = FileContext.getFileContext(cluster.getURI(0));

      // Saving image without safe mode should fail
      DFSAdmin admin = new DFSAdmin(conf);
      String[] args = new String[]{"-saveNamespace"};
      try {
        admin.run(args);
      } catch(IOException eIO) {
        assertTrue(eIO.getLocalizedMessage().contains("Safe mode should be turned ON"));
      } catch(Exception e) {
        throw new IOException(e);
      }
      // create new file
      Path file = new Path("namespace.dat");
      writeFile(fs, file, replication);
      checkFile(fs, file, replication);

      // create new link
      Path symlink = new Path("file.link");
      fc.createSymlink(file, symlink, false);
      assertTrue(fc.getFileLinkStatus(symlink).isSymlink());

      // verify that the edits file is NOT empty
      Collection<URI> editsDirs = cluster.getNameEditsDirs(0);
      for(URI uri : editsDirs) {
        File ed = new File(uri.getPath());
        assertTrue(new File(ed, "current/"
                            + NNStorage.getInProgressEditsFileName(1))
                   .length() > Integer.SIZE/Byte.SIZE);
      }

      // Saving image in safe mode should succeed
      fs.setSafeMode(SafeModeAction.SAFEMODE_ENTER);
      try {
        admin.run(args);
      } catch(Exception e) {
        throw new IOException(e);
      }
     
      // TODO: Fix the test to not require a hard-coded transaction count.
      final int EXPECTED_TXNS_FIRST_SEG = 13;
     
      // the following steps should have happened:
      //   edits_inprogress_1 -> edits_1-12  (finalized)
      //   fsimage_12 created
      //   edits_inprogress_13 created
      //
      for(URI uri : editsDirs) {
        File ed = new File(uri.getPath());
        File curDir = new File(ed, "current");
        LOG.info("Files in " + curDir + ":\n  " +
            Joiner.on("\n  ").join(curDir.list()));
        // Verify that the first edits file got finalized
        File originalEdits = new File(curDir,
                                      NNStorage.getInProgressEditsFileName(1));
        assertFalse(originalEdits.exists());
        File finalizedEdits = new File(curDir,
            NNStorage.getFinalizedEditsFileName(1, EXPECTED_TXNS_FIRST_SEG));
        GenericTestUtils.assertExists(finalizedEdits);
        assertTrue(finalizedEdits.length() > Integer.SIZE/Byte.SIZE);

        GenericTestUtils.assertExists(new File(ed, "current/"
                       + NNStorage.getInProgressEditsFileName(
                           EXPECTED_TXNS_FIRST_SEG + 1)));
      }
     
      Collection<URI> imageDirs = cluster.getNameDirs(0);
      for (URI uri : imageDirs) {
        File imageDir = new File(uri.getPath());
        File savedImage = new File(imageDir, "current/"
                                   + NNStorage.getImageFileName(
                                       EXPECTED_TXNS_FIRST_SEG));
        assertTrue("Should have saved image at " + savedImage,
            savedImage.exists());       
      }

      // restart cluster and verify file exists
      cluster.shutdown();
      cluster = null;

      cluster = new MiniDFSCluster.Builder(conf).numDataNodes(numDatanodes).format(false).build();
      cluster.waitActive();
      fs = (cluster.getFileSystem());
      checkFile(fs, file, replication);
      fc = FileContext.getFileContext(cluster.getURI(0));
      assertTrue(fc.getFileLinkStatus(symlink).isSymlink());
    } finally {
      if(fs != null) fs.close();
      cleanup(cluster);
      cluster = null;
    }
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    nmStartError = null;
  }

  @After
  public void deleteBaseDir() throws IOException {
    FileContext lfs = FileContext.getLocalFSFileContext();
    lfs.delete(new Path(basedir.getPath()), true);
  }
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    nm = new MyNodeManager2(syncBarrier, conf);
    nm.init(conf);
    nm.start();
    // start a container
    ContainerId cId = TestNodeManagerShutdown.createContainerId();
    FileContext localFS = FileContext.getLocalFSFileContext();
    TestNodeManagerShutdown.startContainer(nm, cId, localFS, nmLocalDir,
      new File("start_file.txt"));

    try {
      syncBarrier.await(10000, TimeUnit.MILLISECONDS);
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  }

  @Override
  public Configuration loadConfFile() throws IOException {
    Path confPath = getConfFile();
    FileContext fc = FileContext.getFileContext(confPath.toUri(), conf);
    Configuration jobConf = new Configuration(false);
    jobConf.addResource(fc.open(confPath), confPath.toString());
    return jobConf;
  }
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    app.waitForState(Service.STATE.STOPPED);

    String jobhistoryDir = JobHistoryUtils
        .getHistoryIntermediateDoneDirForUser(conf);

    FileContext fc = null;
    try {
      fc = FileContext.getFileContext(conf);
    } catch (IOException ioe) {
      LOG.info("Can not get FileContext", ioe);
      throw (new Exception("Can not get File Context"));
    }

    if (numMaps == numSuccessfulMaps) {
      String summaryFileName = JobHistoryUtils
          .getIntermediateSummaryFileName(jobId);
      Path summaryFile = new Path(jobhistoryDir, summaryFileName);
      String jobSummaryString = getJobSummary(fc, summaryFile);
      Assert.assertNotNull(jobSummaryString);
      Assert.assertTrue(jobSummaryString.contains("resourcesPerMap=100"));
      Assert.assertTrue(jobSummaryString.contains("resourcesPerReduce=100"));

      Map<String, String> jobSummaryElements = new HashMap<String, String>();
      StringTokenizer strToken = new StringTokenizer(jobSummaryString, ",");
      while (strToken.hasMoreTokens()) {
        String keypair = strToken.nextToken();
        jobSummaryElements.put(keypair.split("=")[0], keypair.split("=")[1]);
      }

      Assert.assertEquals("JobId does not match", jobId.toString(),
          jobSummaryElements.get("jobId"));
      Assert.assertEquals("JobName does not match", "test",
          jobSummaryElements.get("jobName"));
      Assert.assertTrue("submitTime should not be 0",
          Long.parseLong(jobSummaryElements.get("submitTime")) != 0);
      Assert.assertTrue("launchTime should not be 0",
          Long.parseLong(jobSummaryElements.get("launchTime")) != 0);
      Assert
          .assertTrue(
              "firstMapTaskLaunchTime should not be 0",
              Long.parseLong(jobSummaryElements.get("firstMapTaskLaunchTime")) != 0);
      Assert
          .assertTrue("firstReduceTaskLaunchTime should not be 0",
              Long.parseLong(jobSummaryElements
                  .get("firstReduceTaskLaunchTime")) != 0);
      Assert.assertTrue("finishTime should not be 0",
          Long.parseLong(jobSummaryElements.get("finishTime")) != 0);
      Assert.assertEquals("Mismatch in num map slots", numSuccessfulMaps,
          Integer.parseInt(jobSummaryElements.get("numMaps")));
      Assert.assertEquals("Mismatch in num reduce slots", numReduces,
          Integer.parseInt(jobSummaryElements.get("numReduces")));
      Assert.assertEquals("User does not match",
          System.getProperty("user.name"), jobSummaryElements.get("user"));
      Assert.assertEquals("Queue does not match", "default",
          jobSummaryElements.get("queue"));
      Assert.assertEquals("Status does not match", "SUCCEEDED",
          jobSummaryElements.get("status"));
    }

    JobHistory jobHistory = new JobHistory();
    jobHistory.init(conf);
    HistoryFileInfo fileInfo = jobHistory.getJobFileInfo(jobId);
    JobInfo jobInfo;
    long numFinishedMaps;

    synchronized (fileInfo) {
      Path historyFilePath = fileInfo.getHistoryFile();
      FSDataInputStream in = null;
      LOG.info("JobHistoryFile is: " + historyFilePath);
      try {
        in = fc.open(fc.makeQualified(historyFilePath));
      } catch (IOException ioe) {
        LOG.info("Can not open history file: " + historyFilePath, ioe);
        throw (new Exception("Can not open History File"));
      }

      JobHistoryParser parser = new JobHistoryParser(in);
      final EventReader realReader = new EventReader(in);
      EventReader reader = Mockito.mock(EventReader.class);
      if (numMaps == numSuccessfulMaps) {
        reader = realReader;
      } else {
        final AtomicInteger numFinishedEvents = new AtomicInteger(0); // Hack!
        Mockito.when(reader.getNextEvent()).thenAnswer(
            new Answer<HistoryEvent>() {
              public HistoryEvent answer(InvocationOnMock invocation)
                  throws IOException {
                HistoryEvent event = realReader.getNextEvent();
                if (event instanceof TaskFinishedEvent) {
                  numFinishedEvents.incrementAndGet();
                }

                if (numFinishedEvents.get() <= numSuccessfulMaps) {
                  return event;
                } else {
                  throw new IOException("test");
                }
              }
            });
      }

      jobInfo = parser.parse(reader);

      numFinishedMaps = computeFinishedMaps(jobInfo, numMaps, numSuccessfulMaps);

      if (numFinishedMaps != numMaps) {
        Exception parseException = parser.getParseException();
        Assert.assertNotNull("Didn't get expected parse exception",
            parseException);
      }
    }

    Assert.assertEquals("Incorrect username ", System.getProperty("user.name"),
        jobInfo.getUsername());
    Assert.assertEquals("Incorrect jobName ", "test", jobInfo.getJobname());
    Assert.assertEquals("Incorrect queuename ", "default",
        jobInfo.getJobQueueName());
    Assert
        .assertEquals("incorrect conf path", "test", jobInfo.getJobConfPath());
    Assert.assertEquals("incorrect finishedMap ", numSuccessfulMaps,
        numFinishedMaps);
    Assert.assertEquals("incorrect finishedReduces ", numReduces,
        jobInfo.getFinishedReduces());
    Assert.assertEquals("incorrect uberized ", job.isUber(),
        jobInfo.getUberized());
    Map<TaskID, TaskInfo> allTasks = jobInfo.getAllTasks();
    int totalTasks = allTasks.size();
    Assert.assertEquals("total number of tasks is incorrect  ",
        (numMaps + numReduces), totalTasks);

    // Verify aminfo
    Assert.assertEquals(1, jobInfo.getAMInfos().size());
    Assert.assertEquals(MRApp.NM_HOST, jobInfo.getAMInfos().get(0)
        .getNodeManagerHost());
    AMInfo amInfo = jobInfo.getAMInfos().get(0);
    Assert.assertEquals(MRApp.NM_PORT, amInfo.getNodeManagerPort());
    Assert.assertEquals(MRApp.NM_HTTP_PORT, amInfo.getNodeManagerHttpPort());
    Assert.assertEquals(1, amInfo.getAppAttemptId().getAttemptId());
    Assert.assertEquals(amInfo.getAppAttemptId(), amInfo.getContainerId()
        .getApplicationAttemptId());
    Assert.assertTrue(amInfo.getStartTime() <= System.currentTimeMillis()
        && amInfo.getStartTime() >= amStartTimeEst);

    ContainerId fakeCid = MRApp.newContainerId(-1, -1, -1, -1);
    // Assert at taskAttempt level
    for (TaskInfo taskInfo : allTasks.values()) {
      int taskAttemptCount = taskInfo.getAllTaskAttempts().size();
      Assert
          .assertEquals("total number of task attempts ", 1, taskAttemptCount);
      TaskAttemptInfo taInfo = taskInfo.getAllTaskAttempts().values()
          .iterator().next();
      Assert.assertNotNull(taInfo.getContainerId());
      // Verify the wrong ctor is not being used. Remove after mrv1 is removed.
      Assert.assertFalse(taInfo.getContainerId().equals(fakeCid));
    }

    // Deep compare Job and JobInfo
    for (Task task : job.getTasks().values()) {
      TaskInfo taskInfo = allTasks.get(TypeConverter.fromYarn(task.getID()));
      Assert.assertNotNull("TaskInfo not found", taskInfo);
      for (TaskAttempt taskAttempt : task.getAttempts().values()) {
        TaskAttemptInfo taskAttemptInfo = taskInfo.getAllTaskAttempts().get(
            TypeConverter.fromYarn((taskAttempt.getID())));
        Assert.assertNotNull("TaskAttemptInfo not found", taskAttemptInfo);
        Assert.assertEquals("Incorrect shuffle port for task attempt",
            taskAttempt.getShufflePort(), taskAttemptInfo.getShufflePort());
        if (numMaps == numSuccessfulMaps) {
          Assert.assertEquals(MRApp.NM_HOST, taskAttemptInfo.getHostname());
          Assert.assertEquals(MRApp.NM_PORT, taskAttemptInfo.getPort());

          // Verify rack-name
          Assert.assertEquals("rack-name is incorrect",
              taskAttemptInfo.getRackname(), RACK_NAME);
        }
      }
    }

    // test output for HistoryViewer
    PrintStream stdps = System.out;
    try {
      System.setOut(new PrintStream(outContent));
      HistoryViewer viewer;
      synchronized (fileInfo) {
        viewer = new HistoryViewer(fc.makeQualified(
            fileInfo.getHistoryFile()).toString(), conf, true);
      }
      viewer.print();

      for (TaskInfo taskInfo : allTasks.values()) {
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      JobHistoryParser parser;
      JobInfo jobInfo;
      synchronized (fileInfo) {
        Path historyFilePath = fileInfo.getHistoryFile();
        FSDataInputStream in = null;
        FileContext fc = null;
        try {
          fc = FileContext.getFileContext(conf);
          in = fc.open(fc.makeQualified(historyFilePath));
        } catch (IOException ioe) {
          LOG.info("Can not open history file: " + historyFilePath, ioe);
          throw (new Exception("Can not open History File"));
        }
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      JobHistoryParser parser;
      JobInfo jobInfo;
      synchronized (fileInfo) {
        Path historyFilePath = fileInfo.getHistoryFile();
        FSDataInputStream in = null;
        FileContext fc = null;
        try {
          fc = FileContext.getFileContext(conf);
          in = fc.open(fc.makeQualified(historyFilePath));
        } catch (IOException ioe) {
          LOG.info("Can not open history file: " + historyFilePath, ioe);
          throw (new Exception("Can not open History File"));
        }
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                containerLogDir.toString())
            );
      }
      // /////////////////////////// End of variable expansion

      FileContext lfs = FileContext.getLocalFSFileContext();

      Path nmPrivateContainerScriptPath =
          dirsHandler.getLocalPathForWrite(
              getContainerPrivateDir(appIdStr, containerIdStr) + Path.SEPARATOR
                  + CONTAINER_SCRIPT);
      Path nmPrivateTokensPath =
          dirsHandler.getLocalPathForWrite(
              getContainerPrivateDir(appIdStr, containerIdStr)
                  + Path.SEPARATOR
                  + String.format(ContainerLocalizer.TOKEN_FILE_NAME_FMT,
                      containerIdStr));

      DataOutputStream containerScriptOutStream = null;
      DataOutputStream tokensOutStream = null;

      // Select the working directory for the container
      Path containerWorkDir =
          dirsHandler.getLocalPathForWrite(ContainerLocalizer.USERCACHE
              + Path.SEPARATOR + user + Path.SEPARATOR
              + ContainerLocalizer.APPCACHE + Path.SEPARATOR + appIdStr
              + Path.SEPARATOR + containerIdStr,
              LocalDirAllocator.SIZE_UNKNOWN, false);

      String pidFileSuffix = String.format(ContainerLaunch.PID_FILE_NAME_FMT,
          containerIdStr);

      // pid file should be in nm private dir so that it is not
      // accessible by users
      pidFilePath = dirsHandler.getLocalPathForWrite(
          ResourceLocalizationService.NM_PRIVATE_DIR + Path.SEPARATOR
          + pidFileSuffix);
      List<String> localDirs = dirsHandler.getLocalDirs();
      List<String> logDirs = dirsHandler.getLogDirs();

      List<String> containerLogDirs = new ArrayList<String>();
      for( String logDir : logDirs) {
        containerLogDirs.add(logDir + Path.SEPARATOR + relativeContainerLogDir);
      }

      if (!dirsHandler.areDisksHealthy()) {
        ret = ContainerExitStatus.DISKS_FAILED;
        throw new IOException("Most of the disks failed. "
            + dirsHandler.getDisksHealthReport());
      }

      try {
        // /////////// Write out the container-script in the nmPrivate space.
        List<Path> appDirs = new ArrayList<Path>(localDirs.size());
        for (String localDir : localDirs) {
          Path usersdir = new Path(localDir, ContainerLocalizer.USERCACHE);
          Path userdir = new Path(usersdir, user);
          Path appsdir = new Path(userdir, ContainerLocalizer.APPCACHE);
          appDirs.add(new Path(appsdir, appIdStr));
        }
        containerScriptOutStream =
          lfs.create(nmPrivateContainerScriptPath,
              EnumSet.of(CREATE, OVERWRITE));

        // Set the token location too.
        environment.put(
            ApplicationConstants.CONTAINER_TOKEN_FILE_ENV_NAME,
            new Path(containerWorkDir,
                FINAL_CONTAINER_TOKENS_FILE).toUri().getPath());
        // Sanitize the container's environment
        sanitizeEnv(environment, containerWorkDir, appDirs, containerLogDirs,
          localResources);
       
        // Write out the environment
        writeLaunchEnv(containerScriptOutStream, environment, localResources,
            launchContext.getCommands());
       
        // /////////// End of writing out container-script

        // /////////// Write out the container-tokens in the nmPrivate space.
        tokensOutStream =
            lfs.create(nmPrivateTokensPath, EnumSet.of(CREATE, OVERWRITE));
        Credentials creds = container.getCredentials();
        creds.writeTokenStorageToStream(tokensOutStream);
        // /////////// End of writing out container-tokens
      } finally {
        IOUtils.cleanup(LOG, containerScriptOutStream, tokensOutStream);
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      dispatcher.getEventHandler().handle(
        new ContainerDiagnosticsUpdateEvent(containerId, message));
    } finally {
      // cleanup pid file if present
      if (pidFilePath != null) {
        FileContext lfs = FileContext.getLocalFSFileContext();
        lfs.delete(pidFilePath, false);
      }
    }
  }
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Related Classes of org.apache.hadoop.fs.FileContext

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