[PATCH 18/18] vinyl: throttle tx rate if dump does not catch up

[Konstantin Osipov]

* Vladimir Davydov <vdavydov.dev at gmail.com> [18/08/16 23:03]:
> If the rate at which transactions are ready to write to the database is
> greater than the dump bandwidth, memory will get depleted before the
> last dump is complete and all newer transactions will have to wait until
> the dump has been completed, which may take seconds or even minutes:

Why are you limiting the rate only during a dump? What about
compaction throughtput? Write amplification from compaction is
10x+ times higher than from dump, compaction is actually the main
consumer of disk bandwidth. Shouldn't you throttle writes when
write bandwidth is higher than write amplification/disk bandwidth?

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Konstantin Osipov, Moscow, Russia, +7 903 626 22 32
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