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From "Alexey Diomin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-901) Move Framework Counters into a TaskMetric structure
Date Sat, 13 Aug 2011 19:29:27 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-901?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13084701#comment-13084701
] 

Alexey Diomin commented on MAPREDUCE-901:
-----------------------------------------

1. after commit new file created /hadoop/common/trunk/mapreduce/src/java/org/apache/hadoop/mapred/JobInProgress.java.orig
2. bad code for logging (JobInProgress.java:1253)
{code} 
  public synchronized Counters getJobCounters() {
    try {
      throw new IOException("");
    } catch (IOException ioe) {
      LOG.info("getJC", ioe);
    }
    return jobCounters;
  }
{code}



> Move Framework Counters into a TaskMetric structure
> ---------------------------------------------------
>
>                 Key: MAPREDUCE-901
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-901
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>          Components: task
>    Affects Versions: 0.21.0
>            Reporter: Owen O'Malley
>            Assignee: Luke Lu
>             Fix For: 0.23.0
>
>         Attachments: 901_1.patch, 901_1.patch, FrameworkCounterGroup.java, MAPREDUCE-901.patch,
MAPREDUCE-901.patch, MAPREDUCE-901.patch, MAPREDUCE-901.patch_2, mr-901-trunk-v1.patch
>
>
> I think we should move all of the Counters that the framework updates into a single class
called TaskMetrics. TaskMetrics would have specific fields for each of the metrics like input
records, input bytes, output records, etc.
> It would both reduce the serialized size of the heartbeats (by shrinking the Counters
down to just the user's counters) and decrease the latency for updates to the JobTracker (since
Counters are sent at most 1/minute instead of 1/heartbeat).

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