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From "David Bowen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-492) Global counters
Date Thu, 22 Feb 2007 02:51:05 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

David Bowen updated HADOOP-492:

    Attachment: counters.patch

Here's a patch for review.  Some issues and notes:

   * I haven't managed to test this properly with LocalJobRunner because (I think) the namenode
keeps throwing SafeModeException.  Tips on how to resolve this would be appreciated.
   * I called the main counters class Statistics.  Maybe it should be called Counters?
   * I added a couple of counters to the WordCount example.  If it is preferred to keep that
example minimalist, these don't need to go there.
   * From the job info page you can navigate to per-tip and per-task counters if you are interested.
   * JobInProgress sends the per-job counters to the metrics package whenever it updates them.

> Global counters
> ---------------
>                 Key: HADOOP-492
>                 URL: https://issues.apache.org/jira/browse/HADOOP-492
>             Project: Hadoop
>          Issue Type: New Feature
>          Components: mapred
>            Reporter: arkady borkovsky
>         Assigned To: David Bowen
>         Attachments: counters.patch
> It would be nice to have map / reduce job keep aggregated counts for arbitrary events
occuring in its tasks -- the numer of records processed, the numer of exceptions of a specific
type, the number of sentences in passive voice, whatever the jobs finds useful.
> This can be implemented by tasks periodically sending <name, value> pairs to the
jobtracker (in some implementations such messages are piggy-backed on the heartbeats), so
that the job tracker stores all the latests values from each task and aggregates them on a
request.  It should also make the aggregated values available at the job end.  The value for
a task would be flushed when the task fails.
> #491 and #490 may be related to this one.

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