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From Doug Cutting <cutt...@apache.org>
Subject Re: Map input records(on JobTracker website) increasing and decreasing
Date Mon, 05 Jan 2009 21:04:15 GMT
Values can drop if tasks die and must be re-run.


Aaron Kimball wrote:
> The actual number of input records is most likely steadily increasing. The
> counters on the web site are inaccurate until the job is complete; their
> values will fluctuate wildly. I'm not sure why this is.
> - Aaron
> On Mon, Jan 5, 2009 at 8:34 AM, Saptarshi Guha <saptarshi.guha@gmail.com>wrote:
>> Hello,
>> When I check the job tracker web page, and look at the Map Input
>> records read,the map input records goes up to say 1.4MN and then drops
>> to 410K and then goes up again.
>> The same happens with input/output bytes and output records.
>> Why is this? Is there something wrong with the mapper code? In my map
>> function, i assume I have received one line of input.
>> The oscillatory behavior does not occur for tiny datasets, but for 1GB
>> of data (tiny for others) i see this happening.
>> Thank s
>> Saptarshi
>> --
>> Saptarshi Guha - saptarshi.guha@gmail.com

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