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https://issues.apache.org/jira/browse/MAPREDUCE-2216?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12970055#action_12970055
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Devaraj Das commented on MAPREDUCE-2216:
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MAPREDUCE-718?
> speculation should normalize progress rates based on amount of input data
> -------------------------------------------------------------------------
>
> Key: MAPREDUCE-2216
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2216
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: jobtracker
> Reporter: Joydeep Sen Sarma
>
> We frequently see skews in data distribution both on the mappers and
> reducers. The small ones finish quickly and the longer ones immediately get
> speculated. We should normalize progress rates used by speculation with some
> metric correlated to the amount of data processed by the task (like bytes
> read of rows processed). That will prevent these unnecessary speculations.
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