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https://issues.apache.org/jira/browse/MAPREDUCE-66?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Harsh J resolved MAPREDUCE-66.
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Resolution: Not A Problem
This can be explained by looking at the task logs and the sort outputs.
> The local bytes read of Mapper tasks are too high than bytes written
> --------------------------------------------------------------------
>
> Key: MAPREDUCE-66
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-66
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Reporter: Runping Qi
>
> The local bytes read are 6 times that of local bytes written.
> This is very hard to explain.
> Here is the relevant counters:
> Counters for tip_200810170704_0044_m_000001
> File Systems
> Local bytes read 6,684,486,486
> Local bytes written 1,007,113,506
> HDFS bytes read 147,200,700
> Map-Reduce Framework
> Map input records 3,588,883
> Map output records 3,588,883
> Map input bytes 147,200,579
> Map output bytes 464,822,403
> Combine input records 0
> Combine output records 0
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