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
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    this.publicRsrc =
        new LocalResourcesTrackerImpl(null, dispatcher, true, conf);
    this.recordFactory = RecordFactoryProvider.getRecordFactory(conf);

    try {
      FileContext lfs = getLocalFileContext(conf);
      lfs.setUMask(new FsPermission((short)FsPermission.DEFAULT_UMASK));

      cleanUpLocalDir(lfs,delService);

      List<String> localDirs = dirsHandler.getLocalDirs();
      for (String localDir : localDirs) {
        // $local/usercache
        Path userDir = new Path(localDir, ContainerLocalizer.USERCACHE);
        lfs.mkdir(userDir, null, true);
        // $local/filecache
        Path fileDir = new Path(localDir, ContainerLocalizer.FILECACHE);
        lfs.mkdir(fileDir, null, true);
        // $local/nmPrivate
        Path sysDir = new Path(localDir, NM_PRIVATE_DIR);
        lfs.mkdir(sysDir, NM_PRIVATE_PERM, true);
      }

      List<String> logDirs = dirsHandler.getLogDirs();
      for (String logDir : logDirs) {
        lfs.mkdir(new Path(logDir), null, true);
      }
    } catch (IOException e) {
      throw new YarnRuntimeException("Failed to initialize LocalizationService", e);
    }
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    private void writeCredentials(Path nmPrivateCTokensPath)
        throws IOException {
      DataOutputStream tokenOut = null;
      try {
        Credentials credentials = context.getCredentials();
        FileContext lfs = getLocalFileContext(getConfig());
        tokenOut =
            lfs.create(nmPrivateCTokensPath, EnumSet.of(CREATE, OVERWRITE));
        LOG.info("Writing credentials to the nmPrivate file "
            + nmPrivateCTokensPath.toString() + ". Credentials list: ");
        if (LOG.isDebugEnabled()) {
          for (Token<? extends TokenIdentifier> tk : credentials
              .getAllTokens()) {
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    private void writeCredentials(Path nmPrivateCTokensPath)
        throws IOException {
      DataOutputStream tokenOut = null;
      try {
        Credentials credentials = context.getCredentials();
        FileContext lfs = getLocalFileContext(getConfig());
        tokenOut =
            lfs.create(nmPrivateCTokensPath, EnumSet.of(CREATE, OVERWRITE));
        LOG.info("Writing credentials to the nmPrivate file "
            + nmPrivateCTokensPath.toString() + ". Credentials list: ");
        if (LOG.isDebugEnabled()) {
          for (Token<? extends TokenIdentifier> tk : credentials
              .getAllTokens()) {
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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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    this.publicRsrc =
        new LocalResourcesTrackerImpl(null, dispatcher, true, conf);
    this.recordFactory = RecordFactoryProvider.getRecordFactory(conf);

    try {
      FileContext lfs = getLocalFileContext(conf);
      lfs.setUMask(new FsPermission((short)FsPermission.DEFAULT_UMASK));

      cleanUpLocalDir(lfs,delService);

      List<String> localDirs = dirsHandler.getLocalDirs();
      for (String localDir : localDirs) {
        // $local/usercache
        Path userDir = new Path(localDir, ContainerLocalizer.USERCACHE);
        lfs.mkdir(userDir, null, true);
        // $local/filecache
        Path fileDir = new Path(localDir, ContainerLocalizer.FILECACHE);
        lfs.mkdir(fileDir, null, true);
        // $local/nmPrivate
        Path sysDir = new Path(localDir, NM_PRIVATE_DIR);
        lfs.mkdir(sysDir, NM_PRIVATE_PERM, true);
      }

      List<String> logDirs = dirsHandler.getLogDirs();
      for (String logDir : logDirs) {
        lfs.mkdir(new Path(logDir), null, true);
      }
    } catch (IOException e) {
      throw new YarnRuntimeException("Failed to initialize LocalizationService", e);
    }
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    conf.set(CommonConfigurationKeys.FS_PERMISSIONS_UMASK_KEY,  "000");

    try {
      Path stagingPath = FileContext.getFileContext(conf).makeQualified(
          new Path(conf.get(MRJobConfig.MR_AM_STAGING_DIR)));
      FileContext fc=FileContext.getFileContext(stagingPath.toUri(), conf);
      if (fc.util().exists(stagingPath)) {
        LOG.info(stagingPath + " exists! deleting...");
        fc.delete(stagingPath, true);
      }
      LOG.info("mkdir: " + stagingPath);
      //mkdir the staging directory so that right permissions are set while running as proxy user
      fc.mkdir(stagingPath, null, true);
      //mkdir done directory as well
      String doneDir = JobHistoryUtils
          .getConfiguredHistoryServerDoneDirPrefix(conf);
      Path doneDirPath = fc.makeQualified(new Path(doneDir));
      fc.mkdir(doneDirPath, null, true);
    } catch (IOException e) {
      throw new YarnException("Could not create staging directory. ", e);
    }
    conf.set(MRConfig.MASTER_ADDRESS, "test"); // The default is local because of
    // which shuffle doesn't happen
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          conf.set(MRJobConfig.MR_AM_STAGING_DIR,
              new File(conf.get(MRJobConfig.MR_AM_STAGING_DIR))
                  .getAbsolutePath());
        }
      }
      FileContext fc=FileContext.getFileContext(stagingPath.toUri(), conf);
      if (fc.util().exists(stagingPath)) {
        LOG.info(stagingPath + " exists! deleting...");
        fc.delete(stagingPath, true);
      }
      LOG.info("mkdir: " + stagingPath);
      //mkdir the staging directory so that right permissions are set while running as proxy user
      fc.mkdir(stagingPath, null, true);
      //mkdir done directory as well
      String doneDir = JobHistoryUtils.getConfiguredHistoryServerDoneDirPrefix(conf);
      Path doneDirPath = fc.makeQualified(new Path(doneDir));
      fc.mkdir(doneDirPath, null, true);
    } catch (IOException e) {
      throw new YarnRuntimeException("Could not create staging directory. ", e);
    }
    conf.set(MRConfig.MASTER_ADDRESS, "test"); // The default is local because of
                                             // which shuffle doesn't happen
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        value = expandEnvironment(value, containerLogDir);
        entry.setValue(value);
      }
      // /////////////////////////// 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

  • org.apache.hadoop.conf.Configuration
  • org.apache.hadoop.fs.FileContextSymlinkBaseTest
  • org.apache.hadoop.fs.permission.FsPermission
  • org.apache.hadoop.fs.SymlinkBaseTest
  • org.apache.hadoop.fs.TestFcHdfsSymlink
  • org.apache.hadoop.fs.viewfs.ViewFsTestSetup
  • org.apache.hadoop.hdfs.DFSTestUtil
  • org.apache.hadoop.hdfs.server.namenode.OfflineEditsViewerHelper
  • org.apache.hadoop.hdfs.server.namenode.TestCheckpoint
  • org.apache.hadoop.hdfs.server.namenode.TestCreateEditsLog
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