Examples of org.apache.hadoop.fs.FileContext.create()

org.apache.hadoop.fs.FileContext.create()
Create or overwrite file on indicated path and returns an output stream for writing into the file. @param f the file name to open @param createFlag gives the semantics of create; see {@link CreateFlag} @param opts file creation options; see {@link Options.CreateOpts}.
- Progress - to report progress on the operation - default null
- Permission - umask is applied against permisssion: default is FsPermissions:getDefault()
- CreateParent - create missing parent path; default is to not to create parents
- The defaults for the following are SS defaults of the file server implementing the target path. Not all parameters make sense for all kinds of file system - eg. localFS ignores Blocksize, replication, checksum
  - BufferSize - buffersize used in FSDataOutputStream
  - Blocksize - block size for file blocks
  - ReplicationFactor - replication for blocks
  - ChecksumParam - Checksum parameters. server default is used if not specified.
@return {@link FSDataOutputStream} for created file @throws AccessControlException If access is denied @throws FileAlreadyExistsException If file f already exists @throws FileNotFoundException If parent of f does not existand createParent is false @throws ParentNotDirectoryException If parent of f is not adirectory. @throws UnsupportedFileSystemException If file system for f isnot supported @throws IOException If an I/O error occurredExceptions applicable to file systems accessed over RPC: @throws RpcClientException If an exception occurred in the RPC client @throws RpcServerException If an exception occurred in the RPC server @throws UnexpectedServerException If server implementation throwsundeclared exception to RPC server RuntimeExceptions: @throws InvalidPathException If path f is not valid

          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,

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        // /////////// 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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      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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            userUgi.doAs(new PrivilegedExceptionAction<FSDataOutputStream>() {
              @Override
              public FSDataOutputStream run() throws Exception {
                FileContext fc = FileContext.getFileContext(conf);
                fc.setUMask(APP_LOG_FILE_UMASK);
                return fc.create(
                    remoteAppLogFile,
                    EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE),
                    new Options.CreateOpts[] {});
              }
            });

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      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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          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,

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        // /////////// 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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    dst = lfs.makeQualified(dst);
    lfs.mkdir(dst.getParent(), null, true);
    byte[] bytes = new byte[len];
    FSDataOutputStream out = null;
    try {
      out = lfs.create(dst, EnumSet.of(CREATE, OVERWRITE));
      r.nextBytes(bytes);
      out.write(bytes);
    } finally {
      if (out != null) out.close();
    }

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            userUgi.doAs(new PrivilegedExceptionAction<FSDataOutputStream>() {
              @Override
              public FSDataOutputStream run() throws Exception {
                FileContext fc = FileContext.getFileContext(conf);
                fc.setUMask(APP_LOG_FILE_UMASK);
                return fc.create(
                    remoteAppLogFile,
                    EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE),
                    new Options.CreateOpts[] {});
              }
            });

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            userUgi.doAs(new PrivilegedExceptionAction<FSDataOutputStream>() {
              @Override
              public FSDataOutputStream run() throws Exception {
                FileContext fc = FileContext.getFileContext(conf);
                fc.setUMask(APP_LOG_FILE_UMASK);
                return fc.create(
                    remoteAppLogFile,
                    EnumSet.of(CreateFlag.CREATE, CreateFlag.OVERWRITE),
                    new Options.CreateOpts[] {});
              }
            });

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