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https://issues.apache.org/jira/browse/HADOOP-2774?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12650765#action_12650765
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Chris Douglas commented on HADOOP-2774:
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[exec] +1 overall.
[exec] +1 @author. The patch does not contain any @author tags.
[exec] +1 tests included. The patch appears to include 6 new or
modified tests.
[exec] +1 javadoc. The javadoc tool did not generate any warning
messages.
[exec] +1 javac. The applied patch does not increase the total number
of javac compiler warnings.
[exec] +1 findbugs. The patch does not introduce any new Findbugs
warnings.
[exec] +1 Eclipse classpath. The patch retains Eclipse classpath
integrity.
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The latest patch also passes all unit tests on my machine.
> 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
>
> Attachments: HADOOP-2774.patch, HADOOP-2774.patch, HADOOP-2774.patch,
> HADOOP-2774.patch, HADOOP-2774.patch, HADOOP-2774.patch, HADOOP-2774.patch
>
>
> 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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