Java TokenCache.loadTokens方法代碼示例

import org.apache.hadoop.mapreduce.security.TokenCache; //導入方法依賴的package包/類
/**
 * Obtain JobToken, which we'll use as a credential for SASL authentication
 * when connecting to other Giraph BSPWorkers.
 *
 * @param conf Configuration
 * @return a JobToken containing username and password so that client can
 * authenticate with a server.
 */
private Token<JobTokenIdentifier> createJobToken(Configuration conf)
  throws IOException {
  String localJobTokenFile = System.getenv().get(
      UserGroupInformation.HADOOP_TOKEN_FILE_LOCATION);
  if (localJobTokenFile != null) {
    JobConf jobConf = new JobConf(conf);
    Credentials credentials =
        TokenCache.loadTokens(localJobTokenFile, jobConf);
    return TokenCache.getJobToken(credentials);
  } else {
    throw new IOException("createJobToken: Cannot obtain authentication " +
        "credentials for job: file: '" +
        UserGroupInformation.HADOOP_TOKEN_FILE_LOCATION + "' not found");
  }
}
 

import org.apache.hadoop.mapreduce.security.TokenCache; //導入方法依賴的package包/類
/**
 * Load Hadoop Job Token into secret manager.
 *
 * @param conf Configuration
 * @throws IOException
 */
private void setupSecretManager(Configuration conf) throws IOException {
  secretManager = new JobTokenSecretManager();
  String localJobTokenFile = System.getenv().get(
      UserGroupInformation.HADOOP_TOKEN_FILE_LOCATION);
  if (localJobTokenFile == null) {
    throw new IOException("Could not find job credentials: environment " +
        "variable: " + UserGroupInformation.HADOOP_TOKEN_FILE_LOCATION +
        " was not defined.");
  }
  JobConf jobConf = new JobConf(conf);

  // Find the JobTokenIdentifiers among all the tokens available in the
  // jobTokenFile and store them in the secretManager.
  Credentials credentials =
      TokenCache.loadTokens(localJobTokenFile, jobConf);
  Collection<Token<? extends TokenIdentifier>> collection =
      credentials.getAllTokens();
  for (Token<? extends TokenIdentifier> token:  collection) {
    TokenIdentifier tokenIdentifier = decodeIdentifier(token,
        JobTokenIdentifier.class);
    if (tokenIdentifier instanceof JobTokenIdentifier) {
      Token<JobTokenIdentifier> theToken =
          (Token<JobTokenIdentifier>) token;
      JobTokenIdentifier jobTokenIdentifier =
          (JobTokenIdentifier) tokenIdentifier;
      secretManager.addTokenForJob(
          jobTokenIdentifier.getJobId().toString(), theToken);
    }
  }
  if (LOG.isDebugEnabled()) {
    LOG.debug("loaded JobToken credentials: " + credentials + " from " +
        "localJobTokenFile: " + localJobTokenFile);
  }
}
 

import org.apache.hadoop.mapreduce.security.TokenCache; //導入方法依賴的package包/類
/**
 * Localize the job on this tasktracker. Specifically
 * <ul>
 * <li>Cleanup and create job directories on all disks</li>
 * <li>Download the job config file job.xml from the FS</li>
 * <li>Create the job work directory and set {@link TaskTracker#JOB_LOCAL_DIR}
 * in the configuration.
 * <li>Download the job jar file job.jar from the FS, unjar it and set jar
 * file in the configuration.</li>
 * </ul>
 * 
 * @param t task whose job has to be localized on this TT
 * @return the modified job configuration to be used for all the tasks of this
 *         job as a starting point.
 * @throws IOException
 */
JobConf localizeJobFiles(Task t, RunningJob rjob)
    throws IOException, InterruptedException {
  JobID jobId = t.getJobID();
  String userName = t.getUser();

  // Initialize the job directories
  FileSystem localFs = FileSystem.getLocal(fConf);
  getLocalizer().initializeJobDirs(userName, jobId);
  // save local copy of JobToken file
  String localJobTokenFile = localizeJobTokenFile(t.getUser(), jobId);
  rjob.ugi = UserGroupInformation.createRemoteUser(t.getUser());

  Credentials ts = TokenCache.loadTokens(localJobTokenFile, fConf);
  Token<JobTokenIdentifier> jt = TokenCache.getJobToken(ts);
  if (jt != null) { //could be null in the case of some unit tests
    getJobTokenSecretManager().addTokenForJob(jobId.toString(), jt);
  }
  for (Token<? extends TokenIdentifier> token : ts.getAllTokens()) {
    rjob.ugi.addToken(token);
  }
  // Download the job.xml for this job from the system FS
  Path localJobFile =
      localizeJobConfFile(new Path(t.getJobFile()), userName, jobId);

  JobConf localJobConf = new JobConf(localJobFile);
  //WE WILL TRUST THE USERNAME THAT WE GOT FROM THE JOBTRACKER
  //AS PART OF THE TASK OBJECT
  localJobConf.setUser(userName);
  
  // set the location of the token file into jobConf to transfer 
  // the name to TaskRunner
  localJobConf.set(TokenCache.JOB_TOKENS_FILENAME,
      localJobTokenFile);
  

  // create the 'job-work' directory: job-specific shared directory for use as
  // scratch space by all tasks of the same job running on this TaskTracker. 
  Path workDir =
      lDirAlloc.getLocalPathForWrite(getJobWorkDir(userName, jobId
          .toString()), fConf);
  if (!localFs.mkdirs(workDir)) {
    throw new IOException("Mkdirs failed to create " 
                + workDir.toString());
  }
  System.setProperty(JOB_LOCAL_DIR, workDir.toUri().getPath());
  localJobConf.set(JOB_LOCAL_DIR, workDir.toUri().getPath());
  // Download the job.jar for this job from the system FS
  localizeJobJarFile(userName, jobId, localFs, localJobConf);
  
  return localJobConf;
}