Sokhi: "downloads searching for way too many tracks at once" — a wishlist run
that fanned out into ~one batch per album. Verified the actual search/download
concurrency IS capped at 3 (single shared missing_download_executor), so it
wasn't really hammering slskd — but the display showed ~20 "searching" and the
batch list was a mess.
Root cause: run_full_missing_tracks_process was supposed to "block its album-pool
worker for the whole search+download" (that's what the dedicated album_bundle_
executor is for), but it RETURNED the instant it had STARTED the downloads. So
the album pool only throttled the fast analysis phase — every album batch blew
through analysis and immediately dumped its tracks into the shared download pool,
all pre-marked 'searching'. The intended serialization never happened.
Fix: add serialize= to run_full_missing_tracks_process. Album-bundle batches
(dispatched on album_bundle_executor) pass serialize=True and now hold their pool
slot via _wait_for_batch_drain() until every task in the batch reaches a terminal
state — so only ~N albums are in flight at once. The wait is passive (downloads
are driven by the monitor + completion callbacks on other threads, so no
deadlock) and bails on shutdown, a removed batch, or a safety cap. The residual /
playlist / manual paths run on the SHARED pool and pass serialize=False (blocking
there would steal a real download worker), so they're unchanged.
Tests: _wait_for_batch_drain returns immediately when all-terminal, waits until
tasks finish, bails on shutdown, respects the cap, handles a missing batch. 975
download/wishlist tests pass (only the pre-existing soundcloud /app failures).
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