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

org.apache.hadoop.fs.FileContext.open()
Opens an FSDataInputStream at the indicated Path using default buffersize. @param f the file name to open @throws AccessControlException If access is denied @throws FileNotFoundException If file f does not exist @throws UnsupportedFileSystemException If file system for fis not 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 throws undeclared exception to RPC server

    }
    
    public synchronized Configuration loadConfFile() throws IOException {
      FileContext fc = FileContext.getFileContext(confFile.toUri(), conf);
      Configuration jobConf = new Configuration(false);
      jobConf.addResource(fc.open(confFile), confFile.toString());
      return jobConf;
    }
  }


  private SerialNumberIndex serialNumberIndex = null;

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    private final TFile.Reader reader;


    public LogReader(Configuration conf, Path remoteAppLogFile)
        throws IOException {
      FileContext fileContext = FileContext.getFileContext(conf);
      this.fsDataIStream = fileContext.open(remoteAppLogFile);
      reader =
          new TFile.Reader(this.fsDataIStream, fileContext.getFileStatus(
              remoteAppLogFile).getLen(), conf);
      this.scanner = reader.createScanner();
    }

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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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      @Override
      public Configuration loadConfFile() throws IOException {
        FileContext fc = FileContext.getFileContext(configFile.toUri(), conf);
        Configuration jobConf = new Configuration(false);
        jobConf.addResource(fc.open(configFile), configFile.toString());
        return jobConf;
      }
    };
  }

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        getConfig());
    //read the previous history file
    historyFile = fc.makeQualified(JobHistoryUtils.getStagingJobHistoryFile(
        histDirPath, jobName, (applicationAttemptId.getAttemptId() - 1)));  
    LOG.info("History file is at " + historyFile);
    in = fc.open(historyFile);
    JobHistoryParser parser = new JobHistoryParser(in);
    jobInfo = parser.parse();
    Exception parseException = parser.getParseException();
    if (parseException != null) {
      LOG.info("Got an error parsing job-history file " + historyFile +

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    private final TFile.Reader reader;


    public LogReader(Configuration conf, Path remoteAppLogFile)
        throws IOException {
      FileContext fileContext = FileContext.getFileContext(conf);
      this.fsDataIStream = fileContext.open(remoteAppLogFile);
      reader =
          new TFile.Reader(this.fsDataIStream, fileContext.getFileStatus(
              remoteAppLogFile).getLen(), conf);
      this.scanner = reader.createScanner();
    }

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    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"));
      }

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      Path historyFilePath = new Path(jobhistoryDir, jobhistoryFileName);
      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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      Path historyFilePath = new Path(jobhistoryDir, jobhistoryFileName);
      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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    }
    
    public synchronized Configuration loadConfFile() throws IOException {
      FileContext fc = FileContext.getFileContext(confFile.toUri(), conf);
      Configuration jobConf = new Configuration(false);
      jobConf.addResource(fc.open(confFile), confFile.toString());
      return jobConf;
    }
  }


  private SerialNumberIndex serialNumberIndex = null;

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