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Optimize protochunk saving (#2218)

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Use a chunk status cache to check if we could potentially overwrite
a levelchunk.
The check could be entirely elided at the risk of overwriting chunk data,
however most protochunks should have their corresponding regionfile loaded
with their chunk status.
This commit is contained in:
Spottedleaf 2019-06-22 13:17:40 -07:00 committed by Zach
parent 405d146f57
commit 768b46ed63
1 changed files with 28 additions and 0 deletions
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Spigot-Server-Patches/0407-Use-ChunkStatus-cache-when-saving-protochunks.patch Normal file
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From 567cbbf93b099dd1731db47de6ccafdfe60bf142 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Sat, 22 Jun 2019 04:20:47 -0700
Subject: [PATCH] Use ChunkStatus cache when saving protochunks
The cache should contain the chunk status when saving. If not it
will load it.
diff --git a/src/main/java/net/minecraft/server/PlayerChunkMap.java b/src/main/java/net/minecraft/server/PlayerChunkMap.java
index e89738a08d..89649e73e5 100644
--- a/src/main/java/net/minecraft/server/PlayerChunkMap.java
+++ b/src/main/java/net/minecraft/server/PlayerChunkMap.java
@@ -720,8 +720,10 @@ public class PlayerChunkMap extends IChunkLoader implements PlayerChunk.d {
NBTTagCompound nbttagcompound;
if (chunkstatus.getType() != ChunkStatus.Type.LEVELCHUNK) {
- nbttagcompound = this.readChunkData(chunkcoordintpair);
- if (nbttagcompound != null && ChunkRegionLoader.a(nbttagcompound) == ChunkStatus.Type.LEVELCHUNK) {
+ // Paper start - Optimize save by using status cache
+ ChunkStatus statusOnDisk = this.getRegionFile(ichunkaccess.getPos(), false).getStatus(ichunkaccess.getPos().x, ichunkaccess.getPos().z, this);
+ if (statusOnDisk != null && statusOnDisk.getType() == ChunkStatus.Type.LEVELCHUNK) {
+ // Paper end
return false;
}
--
2.21.0