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_r407853686
##########
File path:
core/src/main/scala/org/apache/spark/internal/io/HadoopMapReduceCommitProtocol.scala
##########
@@ -236,13 +265,25 @@ 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 ${attemptId}")
SparkHadoopMapRedUtil.commitTask(
committer, taskContext, attemptId.getJobID.getId,
attemptId.getTaskID.getId)
+ if (dynamicPartitionOverwrite) {
Review comment:
IIUC, `SparkHadoopMapRedUtil.commitTask` will output to
`dynamicStagingTaskFiles` where each task attempt gets its own staging
directory to avoid conflicts. Then, we rename the staging files to their final
destination if not exist.
One minor issue is the following log in `SparkHadoopMapRedUtil.commitTask`.
When we say the task attempt has committed, it's actually not. @turboFei
```
logInfo(s"$mrTaskAttemptID: Committed")
```
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