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Fix concurrency issues with ExpiringMap

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Aikar 2018-09-20 11:43:32 -04:00
parent a7e90f01fe
commit 1b8f425949
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GPG key ID: 401ADFC9891FAAFE
1 changed files with 37 additions and 16 deletions
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53
Spigot-Server-Patches/0372-Fix-major-memory-leaks-in-ExpiringMap.patch → Spigot-Server-Patches/0372-Optimize-and-Fix-ExpiringMap-Issues.patch
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@ -1,34 +1,44 @@
From d6e66d04c997b32aa5563503de5a61f0b09a6507 Mon Sep 17 00:00:00 2001
From e9f487b844501e35de9892cd88dfb2c85835b8f9 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Sun, 16 Sep 2018 00:00:16 -0400
Subject: [PATCH] Fix major memory leaks in ExpiringMap
Subject: [PATCH] Optimize and Fix ExpiringMap Issues
computeIfAbsent would leak as the entry
was never registered into the ttl map
computeIfAbsent would leak as the entry was never
registered into the ttl map, as well as some other
methods were at risk, so they were added.
This fixes that ,as well as redesigns cleaning to
not run on every manipulation, and instead to run clean
once per tick per expiring map.
This also synchronizes all access make the map thread safe.
This also redesigns cleaning to not run on every
manipulation, and instead to run clean
once per tick per active expiring map.
diff --git a/src/main/java/net/minecraft/server/ExpiringMap.java b/src/main/java/net/minecraft/server/ExpiringMap.java
index 4006f5a69c..d64c143017 100644
index 4006f5a69c..9a3b35ea1a 100644
--- a/src/main/java/net/minecraft/server/ExpiringMap.java
+++ b/src/main/java/net/minecraft/server/ExpiringMap.java
@@ -6,25 +6,120 @@ import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
import it.unimi.dsi.fastutil.longs.Long2LongMap.Entry;
@@ -2,29 +2,124 @@ package net.minecraft.server;
import it.unimi.dsi.fastutil.longs.Long2LongLinkedOpenHashMap;
import it.unimi.dsi.fastutil.longs.Long2LongMap;
+import it.unimi.dsi.fastutil.longs.Long2ObjectMaps;
import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
-import it.unimi.dsi.fastutil.longs.Long2LongMap.Entry;
import it.unimi.dsi.fastutil.objects.ObjectIterator;
import java.util.Map;
+import java.util.function.BiFunction;
+import java.util.function.Function;
+import java.util.function.LongFunction;
public class ExpiringMap<T> extends Long2ObjectOpenHashMap<T> {
-public class ExpiringMap<T> extends Long2ObjectOpenHashMap<T> {
+public class ExpiringMap<T> extends Long2ObjectMaps.SynchronizedMap<T> { // paper - synchronize accesss
private final int a;
- private final Long2LongMap b = new Long2LongLinkedOpenHashMap();
+ private final Long2LongMap ttl = new Long2LongLinkedOpenHashMap(); // Paper
public ExpiringMap(int i, int j) {
super(i);
- super(i);
+ super(new Long2ObjectOpenHashMap<>(i)); // Paper
this.a = j;
}
@ -143,7 +153,7 @@ index 4006f5a69c..d64c143017 100644
break;
}
@@ -33,7 +128,25 @@ public class ExpiringMap<T> extends Long2ObjectOpenHashMap<T> {
@@ -33,7 +128,29 @@ public class ExpiringMap<T> extends Long2ObjectOpenHashMap<T> {
objectiterator.remove();
}
}
@ -160,6 +170,10 @@ index 4006f5a69c..d64c143017 100644
+ ttl.putIfAbsent(entry.getLongKey(), now);
+ }
+ } catch (Exception e) { } // Ignore any como's
+ } else if (ttlSize > this.size()) {
+ try {
+ this.ttl.long2LongEntrySet().removeIf(entry -> !this.containsKey(entry.getLongKey()));
+ } catch (Exception e) { } // Ignore any como's
+ }
+ if (isEmpty()) {
+ registered = false;
@ -170,15 +184,22 @@ index 4006f5a69c..d64c143017 100644
}
protected boolean a(T var1) {
@@ -51,7 +164,7 @@ public class ExpiringMap<T> extends Long2ObjectOpenHashMap<T> {
@@ -51,8 +168,13 @@ public class ExpiringMap<T> extends Long2ObjectOpenHashMap<T> {
}
public T get(long i) {
- this.a(i);
+ if (ttl.containsKey(i)) this.setAccess(i); // Paper
return (T)super.get(i);
- return (T)super.get(i);
+ // Paper start - don't setAccess unless a hit
+ T t = super.get(i);
+ if (t != null) {
+ this.setAccess(i);
+ }
+ return t;
+ // Paper end
}
public void putAll(Map<? extends Long, ? extends T> var1) {
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index eb3fc836fb..81cda5df56 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java