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Posted to common-dev@hadoop.apache.org by "Ravi Gummadi (JIRA)" <ji...@apache.org> on 2008/10/21 13:43:45 UTC

[jira] Commented: (HADOOP-2774) Add counters to show number of key/values that have been sorted and merged in the maps and reduces

    [ https://issues.apache.org/jira/browse/HADOOP-2774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12641358#action_12641358 ] 

Ravi Gummadi commented on HADOOP-2774:
--------------------------------------

Owen, Would you please explain your statement  "it is the number of records written to disk, which clearly is the same as the number read + 1. " ?

> 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
>
> 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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