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  1. Hadoop Map/Reduce
  2. MAPREDUCE-6991

getRogueTaskPID and testProcessTree hangs when the file creation failed

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    Details

    • Type: Bug
    • Status: Open
    • Priority: Major
    • Resolution: Unresolved
    • Affects Version/s: 0.23.0, 2.0.0-alpha, 2.5.0
    • Fix Version/s: None
    • Component/s: yarn
    • Labels:
      None

      Description

      When writing to file failed, in the following thread, due to disk full, hardware error, etc,

        private class RogueTaskThread extends Thread {
          public void run() {
            try {
              Vector<String> args = new Vector<String>();
              if(isSetsidAvailable()) {
                args.add("setsid");
              }
              args.add("bash");
              args.add("-c");
              args.add(" echo $$ > " + pidFile + "; sh " +
                                shellScript + " " + N + ";") ;
              shexec = new ShellCommandExecutor(args.toArray(new String[0]));
              shexec.execute();
            } catch (ExitCodeException ee) {
              LOG.info("Shell Command exit with a non-zero exit code. This is" +
                       " expected as we are killing the subprocesses of the" +
                       " task intentionally. " + ee);
            } catch (IOException ioe) {
              LOG.info("Error executing shell command " + ioe);
            } finally {
              LOG.info("Exit code: " + shexec.getExitCode());
            }
          }
        }
      

      The getRogueTaskPID() and testProcessTree() get stuck waiting until the file is created or get interrupted.

        private String getRogueTaskPID() {
          File f = new File(pidFile);
          while (!f.exists()) {
            try {
              Thread.sleep(500);
            } catch (InterruptedException ie) {
              break;
            }
          }
      
          // read from pidFile
          return getPidFromPidFile(pidFile);
        }
      
        public void testProcessTree() throws Exception {
          // create pid file path string
          tempFile = new File(TEST_ROOT_DIR, getClass().getName() + "_pidFile_" + rm.nextInt() + ".pid");
          tempFile.deleteOnExit();
          pidFile = TEST_ROOT_DIR + File.separator + tempFile.getName();
          .....
          Thread t = new RogueTaskThread();
          t.start();
          String pid = getRogueTaskPID();
          ......
      }
      

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            • Assignee:
              Unassigned
              Reporter:
              dustinday John Doe
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              Dates

              • Created:
                Updated: