thejdeep opened a new pull request #34024:
URL: https://github.com/apache/spark/pull/34024
### What changes were proposed in this pull request?
When a DNS issue happens on the executor node, shuffle nodes would get
added to the exclude list due to FetchFailed exception. The change here is to
have a configuration host value to test DNS resolution against before marking
it as a FetchFailed Exception.
### Why are the changes needed?
This would prevent shuffle nodes from getting added to the exclude list due
to DNS issues
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Added Unit Tests
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