Paper/patches/server/0418-Fix-bell-block-entity-memory-leak.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: giacomo <32515303+giacomozama@users.noreply.github.com>
Date: Sat, 10 Oct 2020 12:15:33 +0200
Subject: [PATCH] Fix bell block entity memory leak
BellBlockEntity has a list of entities (entitiesAtRing) that was not being cleared at the right time, causing leaks whenever a bell would be rung near a crowd of entities.
diff --git a/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java b/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java
index e1adfd10a2f67687b7123d20d31eb7d059a3e1e3..86dac3f82da065bf79d94da9df192f51ce4665e2 100644
--- a/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java
+++ b/src/main/java/net/minecraft/world/level/block/entity/BellBlockEntity.java
@@ -63,6 +63,11 @@ public class BellBlockEntity extends BlockEntity {
if (blockEntity.ticks >= 50) {
blockEntity.shaking = false;
+ // Paper start - Fix bell block entity memory leak
+ if (!blockEntity.resonating) {
+ blockEntity.nearbyEntities.clear();
+ }
+ // Paper end - Fix bell block entity memory leak
blockEntity.ticks = 0;
}
@@ -76,6 +81,7 @@ public class BellBlockEntity extends BlockEntity {
++blockEntity.resonationTicks;
} else {
bellEffect.run(world, pos, blockEntity.nearbyEntities);
+ blockEntity.nearbyEntities.clear(); // Paper - Fix bell block entity memory leak
blockEntity.resonating = false;
}
}
@@ -125,6 +131,7 @@ public class BellBlockEntity extends BlockEntity {
}
}
+ this.nearbyEntities.removeIf(e -> !e.isAlive()); // Paper - Fix bell block entity memory leak
}
private static boolean areRaidersNearby(BlockPos pos, List<LivingEntity> hearingEntities) {