Github user kayousterhout commented on the issue:
https://github.com/apache/spark/pull/17144
Ok this LGTM and I merged to master.
I tested this a bunch because in theory, it seems like the check that the
block has been properly re-replicated should / could happen inside the loop
(after each block is removed), which would also avoid the sleep. But there
seem to be various race conditions in the code that means this doesn't work,
and this PR remains an incremental improvement to make this more reliable.
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