[jira] [Created] (SPARK-21882) OutputMetrics doesn't count written bytes correctly in the saveAsHadoopDataset function

["linxiaojun (JIRA)" <ji...@apache.org>]

linxiaojun created SPARK-21882:
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             Summary: 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: 2.2.0, 1.6.1
            Reporter: linxiaojun
            Priority: Minor


The first job called from saveAsHadoopDataset, running in each executor, does not calculate the writtenBytes of OutputMetrics correctly. 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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