Schedule out-of-band dequeue in TLogManager::Synchronize()

Synchronize() spins on SchedYield() waiting for FlushedEvents_ to catch
up with EnqueuedEvents_. Without this fix it relies on the 30 ms periodic
dequeue cycle, so each call can stall up to 30 ms.

With FlushLogAfterMutations enabled in cell_balancer tests, the binary
makes 3000+ Synchronize() calls per run. On an idle CI machine the binary
finishes in ~43 s; on a loaded one, where the logging thread is delayed,
it exceeds the 60 s SMALL-test timeout.

Fix: call DequeueExecutor_->ScheduleOutOfBand() at the top of
Synchronize() so the dequeue fires immediately instead of waiting for
the next periodic tick.
commit_hash:90efee0cca030024d04a7e9defd024f121684b9f

0 files changed, 0 insertions, 0 deletions