Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/3783#issuecomment-69284237
> Can you explain how (1) is related to SPARK-4951? It seems to me that (2)
is sufficient in triggering the issue.
The original implementation will mark an exeuctor idle when receiving
`SparkListenerBlockManagerAdded`.
So if `SparkListenerTaskStart` is received before
`SparkListenerBlockManagerAdded`, when receiving
`SparkListenerBlockManagerAdded`, the executor will be marked idle even if
there is a task running in it. Therefore, the executor will be killed when it's
expired.
That's why I said it's related. Of cause, we can also say (1) is a special
case of (2).
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