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https://issues.apache.org/jira/browse/MAPREDUCE-1667?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12853317#action_12853317
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Ruyue Ma commented on MAPREDUCE-1667:
-------------------------------------
A suggestion:
According the completed maps, we get the average mapOutputSize =
CompletedMapsOutputSize / CompletedMapsNum. We get the EstimatedMapOutputSize =
2 * average。
> resource estimation still works badly in some cases
> ---------------------------------------------------
>
> Key: MAPREDUCE-1667
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1667
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Reporter: Ruyue Ma
> Assignee: Ruyue Ma
>
> A premise upon which our current implemention of ResourceEstimator is that
> the MapInputSize and MapOutputSize has relation.
> In many user cases, the premise is not satisfied.
> e.g.
> 1. The map input is a file list.
> 2. Every mapper will download the file, process, then output (into map
> intermediate output)
> if one file name is very long, the estimated output size maybe very big.
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