Github user suyanNone commented on the pull request:
https://github.com/apache/spark/pull/4055#issuecomment-118708012
@squito oh...I had skipped it...
1) Task attempt now is described in `TaskInfo` in Spark `TaskSetManager`.
`TaskSetManager` is responsible for completing task attempt `TaskInfo`, which
identified by `TaskID`. and if `TaskSetManager` is think a attempt was
succeed, then call `dagScheduler` to complete the `tasks(index)` which is a
`Task`.
so it will make some sense that identified a `Task` by stageId and
partitionID?
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