Fix slow database queries, by using partial index `idx_torrentstate__…

…last_check__partial`

src/tribler/core/components/metadata_store/db/store.py

@@ -690,9 +690,9 @@ def get_entries_query(
             t = time() - POPULAR_TORRENTS_FRESHNESS_PERIOD
             health_list = list(
                 select(
-                    health
-                    for health in self.TorrentState
-                    if health.last_check >= t and (health.seeders > 0 or health.leechers > 0)
+                    health for health in self.TorrentState
+                    if health.has_data == 1  # The condition had to be written this way for the partial index to work
+                    and health.last_check >= t and (health.seeders > 0 or health.leechers > 0)
                 ).order_by(
                     lambda health: (desc(health.seeders), desc(health.leechers), desc(health.last_check))
                 )[:POPULAR_TORRENTS_COUNT]
@@ -748,7 +748,8 @@ def get_entries_query(
         )
 
         if health_checked_after is not None:
-            pony_query = pony_query.where(lambda g: g.health.last_check >= health_checked_after)
+            pony_query = pony_query.where(lambda g: g.health.has_data == 1  # Has to be written this way for index
+                                          and g.health.last_check >= health_checked_after)
 
         # Sort the query
         pony_query = pony_query.sort_by("desc(g.rowid)" if sort_desc else "g.rowid")

src/tribler/core/components/torrent_checker/torrent_checker/tests/test_torrentchecker.py

@@ -173,7 +173,7 @@ async def test_check_random_tracker_not_alive(torrent_checker):
 async def test_task_select_tracker(torrent_checker):
     with db_session:
         tracker = torrent_checker.mds.TrackerState(url="https://localhost/tracker")
-        torrent_checker.mds.TorrentState(infohash=b'a' * 20, seeders=5, leechers=10, trackers={tracker})
+        torrent_checker.mds.TorrentState(infohash=b'a' * 20, seeders=5, leechers=10, trackers={tracker}, last_check=1)
 
     controlled_session = HttpTrackerSession("127.0.0.1", ("localhost", 8475), "/announce", 5, None)
     controlled_session.connect_to_tracker = lambda: succeed(None)

src/tribler/core/components/torrent_checker/torrent_checker/torrent_checker.py

@@ -124,7 +124,9 @@ async def check_random_tracker(self):
         url = tracker.url
         with db_session:
             dynamic_interval = TORRENT_CHECK_RETRY_INTERVAL * (2 ** tracker.failures)
-            torrents = select(ts for ts in tracker.torrents if ts.last_check + dynamic_interval < int(time.time()))
+            torrents = select(ts for ts in tracker.torrents
+                              if ts.has_data == 1  # The condition had to be written this way for the index to work
+                              and ts.last_check + dynamic_interval < int(time.time()))
             infohashes = [t.infohash for t in torrents[:MAX_TORRENTS_CHECKED_PER_SESSION]]
 
         if len(infohashes) == 0:
@@ -198,8 +200,8 @@ def load_torrents_checked_from_db(self) -> Dict[bytes, HealthInfo]:
         now = int(time.time())
         last_fresh_time = now - HEALTH_FRESHNESS_SECONDS
         checked_torrents = list(self.mds.TorrentState
-                                .select(lambda g: g.has_data and g.self_checked
-                                                  and between(g.last_check, last_fresh_time, now))
+                                .select(lambda g: g.has_data == 1  # Had to be written this way for index to work
+                                        and g.self_checked and between(g.last_check, last_fresh_time, now))
                                 .order_by(lambda g: (desc(g.seeders), g.last_check))
                                 .limit(TORRENTS_CHECKED_RETURN_SIZE))
 
@@ -223,11 +225,15 @@ def torrents_to_check(self):
         By old torrents, we refer to those checked quite farther in the past, sorted by the last_check value.
         """
         last_fresh_time = time.time() - HEALTH_FRESHNESS_SECONDS
-        popular_torrents = list(self.mds.TorrentState.select(lambda g: g.last_check < last_fresh_time).
-                                order_by(lambda g: (desc(g.seeders), g.last_check)).limit(TORRENT_SELECTION_POOL_SIZE))
+        popular_torrents = list(self.mds.TorrentState.select(
+            lambda g: g.has_data == 1  # The condition had to be written this way for the partial index to work
+            and g.last_check < last_fresh_time
+        ).order_by(lambda g: (desc(g.seeders), g.last_check)).limit(TORRENT_SELECTION_POOL_SIZE))
 
-        old_torrents = list(self.mds.TorrentState.select(lambda g: g.last_check < last_fresh_time).
-                            order_by(lambda g: (g.last_check, desc(g.seeders))).limit(TORRENT_SELECTION_POOL_SIZE))
+        old_torrents = list(self.mds.TorrentState.select(
+            lambda g: g.has_data == 1  # The condition had to be written this way for the partial index to work
+            and g.last_check < last_fresh_time
+        ).order_by(lambda g: (g.last_check, desc(g.seeders))).limit(TORRENT_SELECTION_POOL_SIZE))
 
         selected_torrents = popular_torrents + old_torrents
         selected_torrents = random.sample(selected_torrents, min(TORRENT_SELECTION_POOL_SIZE, len(selected_torrents)))
@@ -254,6 +260,7 @@ def torrents_to_check_in_user_channel(self):
         channel_torrents = list(self.mds.TorrentMetadata.select(
             lambda g: g.public_key == self.mds.my_public_key_bin
                       and g.metadata_type == REGULAR_TORRENT
+                      and g.health.has_data == 1  # The condition had to be written this way for the index to work
                       and g.health.last_check < last_fresh_time)
                                 .order_by(lambda g: g.health.last_check)
                                 .limit(USER_CHANNEL_TORRENT_SELECTION_POOL_SIZE))