Github user markap14 commented on the issue:
https://github.com/apache/nifi/pull/1000
@patricker @mcgilman looking at the PR, I do think that this will resolve
the specific use case that you're running into, Peter. I think, though, that it
is addressing a very specific corner case and could actually be solved a little
more generally, though. Instead of changing the number of swap files based on
the specific condition of `activeQueue.size() == 0 && numSwapFiles > 0 &&
swapQueue.size() % SWAP_RECORD_POLL_SIZE == 0` what do you think of just
calling `migrateSwapToActive()` at the beginning of the
`writeSwapFilesIfNecessary()`? This should also ensure that we keep with the
same ordering guarantees that we have provided throughout the rest of the class.
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