Explain choice of rehash value

mcculls · mcculls · commit 0a3d354287d8 · 2026-06-19T14:35:46.000+01:00
diff --git a/components/context/src/main/java/datadog/context/NoopContextScope.java b/components/context/src/main/java/datadog/context/NoopContextScope.java
@@ -68,6 +68,7 @@ public Context context() {
   public void close() {}
 
   private static int rehash(int oldHash) {
+    // scatter in both directions using value close to golden ratio
     return Integer.reverseBytes(oldHash * 0x9e3775cd) * 0x9e3775cd;
   }
 }

Original file line number	Diff line number	Diff line change
`@@ -68,6 +68,7 @@ public Context context() {`
`68`	`68`	`public void close() {}`
`69`	`69`
`70`	`70`	`private static int rehash(int oldHash) {`
	`71`	`+ // scatter in both directions using value close to golden ratio`
`71`	`72`	`return Integer.reverseBytes(oldHash * 0x9e3775cd) * 0x9e3775cd;`
`72`	`73`	`}`
`73`	`74`	`}`