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https://issues.apache.org/jira/browse/SPARK-4157?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Charles Reiss resolved SPARK-4157.
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Resolution: Duplicate
> Task input statistics incomplete when a task reads from multiple locations
> --------------------------------------------------------------------------
>
> Key: SPARK-4157
> URL: https://issues.apache.org/jira/browse/SPARK-4157
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.1.0
> Reporter: Charles Reiss
> Priority: Minor
>
> SPARK-1683 introduced tracking of filesystem reads for tasks, but the
> tracking code assumes that each task reads from exactly one file/cache block,
> and replaces any prior InputMetrics object for a task after each read.
> But, for example, a task computing a shuffle-less join (input RDDs are
> prepartitioned by key) may read two or more cached dependency RDD blocks from
> cache. In this case, the displayed input size will be for whichever
> dependency was requested last.
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