Github user ajbozarth commented on the issue:
https://github.com/apache/spark/pull/14673
secondary sort in this case is whatever order the collection is stored in,
since `LinkedHashMap` keeps an order (essentially by `tasked`, but really by
insertion order) `tasked` becomes the defacto secondary sort. In `HashMap`
there's no guaranteed order and it's secondary sort is whatever order the
hashes are stored (this can be consistent in controlled environments like test
suites).
tl;dr it doesn't change secondary sort in a bad way, it just provides an
order that previously didn't exist.
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