manuzhang commented on a change in pull request #26339:
[SPARK-27194][SPARK-29302][SQL] Fix the issue that for dynamic partition
overwrite a task would conflict with its speculative task
URL: https://github.com/apache/spark/pull/26339#discussion_r407834451
##########
File path:
core/src/main/scala/org/apache/spark/internal/io/HadoopMapReduceCommitProtocol.scala
##########
@@ -236,13 +267,25 @@ class HadoopMapReduceCommitProtocol(
committer.setupTask(taskContext)
addedAbsPathFiles = mutable.Map[String, String]()
partitionPaths = mutable.Set[String]()
+ dynamicStagingTaskFiles = mutable.Set[Path]()
}
override def commitTask(taskContext: TaskAttemptContext): TaskCommitMessage
= {
val attemptId = taskContext.getTaskAttemptID
logTrace(s"Commit task ${attemptId}")
SparkHadoopMapRedUtil.commitTask(
committer, taskContext, attemptId.getJobID.getId,
attemptId.getTaskID.getId)
+ if (dynamicPartitionOverwrite) {
+ val fs = stagingDir.getFileSystem(taskContext.getConfiguration)
+ dynamicStagingTaskFiles.foreach { stagingTaskFile =>
+ val fileName = stagingTaskFile.getName
+ val partitionPath = getDynamicPartitionPath(stagingTaskFile,
taskContext)
+ val finalFile = new Path(partitionPath, fileName)
+ if (!fs.exists(finalFile) && !fs.rename(stagingTaskFile, finalFile)) {
Review comment:
It was a dumb question by me. It's by design to skip `rename` when
`finalFile` exists to avoid conflicts. As to when the `finalFile` will exist,
are you saying there will be no conflict with task speculation if output commit
coordination is enabled ?
Another question is if it's possible the existing `finalFile` is corrupted
due to another task crashing during commit.
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