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https://issues.apache.org/jira/browse/MAPREDUCE-5873?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Lowe updated MAPREDUCE-5873:
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Summary: Shuffle bandwidth computation includes time spent waiting for maps
(was: Measure bw of a single copy call and display the correct aggregated bw)
> Shuffle bandwidth computation includes time spent waiting for maps
> ------------------------------------------------------------------
>
> Key: MAPREDUCE-5873
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-5873
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Affects Versions: 2.3.0
> Reporter: Siqi Li
> Assignee: Siqi Li
> Attachments: MAPREDUCE-5873.v1.patch, MAPREDUCE-5873.v2.patch,
> MAPREDUCE-5873.v3.patch, MAPREDUCE-5873.v4.patch, MAPREDUCE-5873.v5.patch,
> MAPREDUCE-5873.v6.patch, MAPREDUCE-5873.v9.patch
>
>
> Currently ShuffleScheduler in ReduceTask JVM status displays bandwidth. Its
> definition however is confusing because it captures the time where there is
> no copying because there is a pause between when new wave of map outputs is
> available.
> current bw is definded as (bytes copied so far) / (total time in the copy
> phase so far)
> It would be more useful
> 1) to measure bandwidth of a single copy call.
> 2) display aggregated bw as long as there is at least one fetcher is in the
> copy call.
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