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

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 1.6.1, 2.2.0
• Fix Version/s: 2.3.4, 2.4.4, 3.0.0
• Component/s: Spark Core
• Flags: Patch
• Assignee: linxiaojun
• Reporter: linxiaojun
• Created: 31/Aug/17 07:38
• Updated: 14/Jun/19 17:48
• Resolved: 14/Jun/19 17:47

Description

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.

Issue Links

• links to: [Github] Pull Request #19118 (awarrior)
• links to: GitHub Pull Request #19118
• links to: GitHub Pull Request #24863