Github user mgaido91 commented on the issue:
https://github.com/apache/spark/pull/21502
@maropu I think a monitor thread would be useless. Once the container is
gone, there is nothing we can do. Another solution which may be worth to
investigate is to clear the block manager for an executor before killing it.
But I am not sure about this, as it introduces an overhead during the
scale-down of containers.
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