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https://issues.apache.org/jira/browse/SPARK-21882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16152097#comment-16152097
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Apache Spark commented on SPARK-21882:
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User 'awarrior' has created a pull request for this issue:
https://github.com/apache/spark/pull/19115
> OutputMetrics doesn't count written bytes correctly in the
> saveAsHadoopDataset function
> ---------------------------------------------------------------------------------------
>
> Key: SPARK-21882
> URL: https://issues.apache.org/jira/browse/SPARK-21882
> Project: Spark
> Issue Type: Bug
> Components: Spark Core
> Affects Versions: 1.6.1, 2.2.0
> Reporter: linxiaojun
> Priority: Minor
> Attachments: SPARK-21882.patch
>
>
> The first job called from saveAsHadoopDataset, running in each executor, does
> not calculate the writtenBytes of OutputMetrics correctly (writtenBytes is
> 0). The reason is that we did not initialize the callback function called to
> find bytes written in the right way. As usual, statisticsTable which records
> statistics in a FileSystem must be initialized at the beginning (this will be
> triggered when open SparkHadoopWriter). The solution for this issue is to
> adjust the order of callback function initialization.
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