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Date: Tue, 11 Nov 2008 11:33:44 -0800 (PST)
From: "Ravi Gummadi (JIRA)" <jira@apache.org>
To: core-dev@hadoop.apache.org
Subject: [jira] Updated: (HADOOP-2774) Add counters to show number of
 key/values that have been sorted and merged in the maps and reduces
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     [ https://issues.apache.org/jira/browse/HADOOP-2774?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ravi Gummadi updated HADOOP-2774:
---------------------------------

    Fix Version/s: 0.20.0
           Status: Patch Available  (was: Open)

The following 2 new counters
(1) Map First Level Spills(Number of first level spills in map task) and
(2) Spilled Records(number of records spilled to disk) --- both in Maps and Reduces
are added with this patch.

> Add counters to show number of key/values that have been sorted and merged in the maps and reduces
> --------------------------------------------------------------------------------------------------
>
>                 Key: HADOOP-2774
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2774
>             Project: Hadoop Core
>          Issue Type: Bug
>            Reporter: Owen O'Malley
>            Assignee: Ravi Gummadi
>             Fix For: 0.20.0
>
>
> For each *pass* of the sort and merge, I would like a count of the number of records. So for example, if the map output 100 records and they were sorted once, the counter would be 100. If it spilled twice and was merged together, it would be 200. Clearly in a multi-level merge, it may not be a multiple of the number of map output records. This would let the users easily see if they have values like io.sort.mb or io.sort.factor set too low.

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