We've observed this internally too.
Shinichi, tx for the patch. Will follow up on JIRA to get it committed.
On Sep 3, 2013, at 11:35 AM, Shinichi Yamashita wrote:
> I reported this issue in MAPREDUCE-5376 (https://issues.apache.org/jira/browse/MAPREDUCE-5376) and attached a patch.
> But it is not fixed by the current release.
> (2013/09/03 11:20), Robert Dyer wrote:
>> I just noticed the job status for MR jobs tends to show 0's in the Map
>> and Reduce columns but actually shows the totals correctly.
>> I am not sure exactly when this started happening, but this cluster was
>> upgraded from Hadoop 1.0.4 to 1.1.2 and now to 1.2.1. It definitely
>> worked fine on 1.0.4, but I don't recall testing on 1.1.2.
>> Anyone else running into this issue?
>> Map-Reduce Framework Reduce input groups 0 0 0
>> Map output materialized bytes 0 0 5,910
>> Combine output records 0 0 250
>> Map input records 0 0 48,556
>> Reduce shuffle bytes 0 0 4,960
>> Physical memory (bytes) snapshot 0 0 56,364,822,528
>> Note that not *all* counters are doing this! Some still show properly:
>> FileSystemCounters HDFS_BYTES_READ 844,499,067,747 0 844,499,067,747
>> FILE_BYTES_WRITTEN 4,879,509 60,403 4,939,912
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