[jira] Commented: (HADOOP-4983) Job counters sometimes go down as tasks run without task failures

["Amareshwari Sriramadasu (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HADOOP-4983?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12661457#action_12661457 ] 

Amareshwari Sriramadasu commented on HADOOP-4983:
-------------------------------------------------

This happens, because TaskInProgress replaces counters in every status update and sometimes, status update doesnot have counters.
The code doing the same is in the method, TaskInProgress.recomputeProgress() :
{code}
        } else if (status.getRunState() == TaskStatus.State.RUNNING) {
          if (status.getProgress() >= bestProgress) {
            bestProgress = status.getProgress();
            bestState = status.getStateString();
            bestCounters = status.getCounters();
          }
        }
      }
{code}


> Job counters sometimes go down as tasks run without task failures
> -----------------------------------------------------------------
>
>                 Key: HADOOP-4983
>                 URL: https://issues.apache.org/jira/browse/HADOOP-4983
>             Project: Hadoop Core
>          Issue Type: Bug
>          Components: mapred
>            Reporter: Owen O'Malley
>            Priority: Critical
>
> As tasks run, the counters seem to back up and move forward again. They always seem to be right when the task completes. I suspect this may have been introduced in HADOOP-2208.

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