refactor: block on StopPrefetchers() instead of cleanup
#1396
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darioush
reviewed
Nov 22, 2024
Comment on lines
+309
to
+310
| sf.pool.wait() | ||
| close(sf.term) |
Comment on lines
+75
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+84
| // Calling abort() sequentially may result in later fetchers accepting new | ||
| // work in the interim. | ||
| var wg sync.WaitGroup | ||
| for _, f := range p.fetchers { | ||
| wg.Add(1) | ||
| go func(f *subfetcher) { | ||
| f.abort() | ||
| wg.Done() | ||
| }(f) | ||
| } |
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I don't think this is needed, the user of triePrefetcher should not call prefetch after or concurrently with abort.
Also this doesn't guarantee the cancellation.
IMO we can remove this part, rename the fn to releaseWorkerPools() and call it after the sequential abort loop before line 109
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If you use a shared
BoundedWorkersacross all tries1 then it's sufficient23 to block onStateDB.StopPrefetcher()or ontriePrefetcher.close()when you don't have a full DB.Footnotes
I think this is what we should be doing as it's the point of
BoundedWorkers. It's also what your original implementation had too. ↩There was a bug in my ordering of the
deferstatements at the top ofsubfetcher.loop(). I fixed it here; on my libevm branch I also added a test to prove thatStopPrefetcher()blocks untilWorkerPool.Wait()returns. ↩I (wrongly) assumed that
BoundedWorkerswould allow extra work whileWait()ing. ↩