[server] Prohibit the creation of TableAssignment with zero buckets (#1489)

LiebingYu · Liebing · web-flow · commit 4d28ee3a2573 · 2025-08-06T19:04:32.000+08:00
Co-authored-by: Liebing &lt;yuliebing.ylb@alibaba-inc.com&gt;
diff --git a/fluss-server/src/main/java/com/alibaba/fluss/server/utils/TableAssignmentUtils.java b/fluss-server/src/main/java/com/alibaba/fluss/server/utils/TableAssignmentUtils.java
@@ -47,7 +47,7 @@ protected static TableAssignment generateAssignment(
             TabletServerInfo[] servers,
             int startIndex,
             int nextReplicaShift) {
-        if (nBuckets < 0) {
+        if (nBuckets <= 0) {
             throw new InvalidBucketsException("Number of buckets must be larger than 0.");
         }
 

Original file line number	Diff line number	Diff line change
`@@ -47,7 +47,7 @@ protected static TableAssignment generateAssignment(`
`47`	`47`	`TabletServerInfo[] servers,`
`48`	`48`	`int startIndex,`
`49`	`49`	`int nextReplicaShift) {`
`50`		`- if (nBuckets < 0) {`
	`50`	`+ if (nBuckets <= 0) {`
`51`	`51`	`throw new InvalidBucketsException("Number of buckets must be larger than 0.");`
`52`	`52`	`}`
`53`	`53`