cloud-fan commented on a change in pull request #33002:
URL: https://github.com/apache/spark/pull/33002#discussion_r655651456
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/ManifestFileCommitProtocol.scala
##########
@@ -113,12 +113,15 @@ class ManifestFileCommitProtocol(jobId: String, path:
String)
override def newTaskTempFile(
taskContext: TaskAttemptContext, dir: Option[String], ext: String):
String = {
- // The file name looks like
part-r-00000-2dd664f9-d2c4-4ffe-878f-c6c70c1fb0cb_00003.gz.parquet
- // Note that %05d does not truncate the split number, so if we have more
than 100000 tasks,
+ // Use the Spark task attempt ID which is unique within the write job, so
that file writes never
+ // collide if the file name also includes job ID. The Hadoop task id is
equivalent to Spark's
+ // partitionId, which is not unique within the write job, for cases like
task retry or
+ // speculative tasks.
+ val taskId = TaskContext.get.taskAttemptId()
+ // The file name looks like
part-00000-2dd664f9-d2c4-4ffe-878f-c6c70c1fb0cb_00003.gz.parquet
+ // Note that %05d does not truncate the taskId, so if we have more than
100000 tasks,
// the file name is fine and won't overflow.
- val split = taskContext.getTaskAttemptID.getTaskID.getId
- val uuid = UUID.randomUUID.toString
- val filename = f"part-$split%05d-$uuid$ext"
Review comment:
Currently it does so to avoid file name collision, but I think it's
overkill and we can use "task attempt id + job id" to avoid name collision as
well, which is more consistent with the batch side.
It may also be useful to include the job id in the file name like the batch
side does, so that people can see which files were written by the same job.
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