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https://issues.apache.org/jira/browse/SPARK-28332?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-28332:
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Assignee: (was: Apache Spark)
> SQLMetric wrong initValue
> --------------------------
>
> Key: SPARK-28332
> URL: https://issues.apache.org/jira/browse/SPARK-28332
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Reporter: Song Jun
> Priority: Minor
>
> Currently SQLMetrics.createSizeMetric create a SQLMetric with initValue set
> to -1.
> If there is a ShuffleMapStage with lots of Tasks which read 0 bytes data,
> these tasks will send the metric(the metric value still be the initValue with
> -1) to Driver, then Driver do metric merge for this Stage in
> DAGScheduler.updateAccumulators, this will cause the merged metric value of
> this Stage set to be a negative value.
> This is incorrect， we should set the initValue to 0 .
> Another same case in SQLMetrics.createTimingMetric.
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