Backport lookahead

amarziali · amarziali · commit 26c993b7ddd4 · 2025-12-08T09:32:34.000+01:00
diff --git a/utils/queue-utils/src/main/java/datadog/common/queue/SpscArrayQueueVarHandle.java b/utils/queue-utils/src/main/java/datadog/common/queue/SpscArrayQueueVarHandle.java
@@ -21,7 +21,7 @@ public SpscArrayQueueVarHandle(int requestedCapacity) {
     // This should go in a common place because today is defined under jctools-channel
     // but here I'd like not to draw that dependency
     lookAheadStep =
-        Math.min(capacity / 4, Integer.getInteger("jctools.spsc.max.lookahead.step", 4096));
+        Math.min(capacity / 4,4096); // 4096 is the default look-ahead in jctools (see `jctools.spsc.max.lookahead.step`)
   }
 
   /**

Original file line number	Diff line number	Diff line change
`@@ -21,7 +21,7 @@ public SpscArrayQueueVarHandle(int requestedCapacity) {`
`21`	`21`	`// This should go in a common place because today is defined under jctools-channel`
`22`	`22`	`// but here I'd like not to draw that dependency`
`23`	`23`	`lookAheadStep =`
`24`		`- Math.min(capacity / 4, Integer.getInteger("jctools.spsc.max.lookahead.step", 4096));`
	`24`	+ Math.min(capacity / 4,4096); // 4096 is the default look-ahead in jctools (see `jctools.spsc.max.lookahead.step`)
`25`	`25`	`}`
`26`	`26`
`27`	`27`	`/**`