kafka protocol: align advertised and validated API version ranges with implemented handlers (Fetch<=v7, ListOffsets<=v2, FindCoordinator<=v2, OffsetCommit/OffsetFetch<=v2); keep Metadata<=v7, JoinGroup<=v7, SyncGroup<=v5

weed/mq/kafka/protocol/handler.go

@@ -450,10 +450,10 @@ func (h *Handler) handleApiVersions(correlationID uint32) ([]byte, error) {
 	response = append(response, 0, 0) // min version 0
 	response = append(response, 0, 7) // max version 7
 
-	// API Key 2 (ListOffsets): api_key(2) + min_version(2) + max_version(2)
+	// API Key 2 (ListOffsets): limit to v2 (implemented and tested)
 	response = append(response, 0, 2) // API key 2
 	response = append(response, 0, 0) // min version 0
-	response = append(response, 0, 5) // max version 5
+	response = append(response, 0, 2) // max version 2
 
 	// API Key 19 (CreateTopics): api_key(2) + min_version(2) + max_version(2)
 	response = append(response, 0, 19) // API key 19
@@ -471,10 +471,10 @@ func (h *Handler) handleApiVersions(correlationID uint32) ([]byte, error) {
 	response = append(response, 0, 0) // min version 0
 	response = append(response, 0, 7) // max version 7
 
-	// API Key 1 (Fetch): api_key(2) + min_version(2) + max_version(2)
-	response = append(response, 0, 1)  // API key 1
-	response = append(response, 0, 0)  // min version 0
-	response = append(response, 0, 11) // max version 11
+	// API Key 1 (Fetch): limit to v7 (current handler semantics)
+	response = append(response, 0, 1) // API key 1
+	response = append(response, 0, 0) // min version 0
+	response = append(response, 0, 7) // max version 7
 
 	// API Key 11 (JoinGroup): api_key(2) + min_version(2) + max_version(2)
 	response = append(response, 0, 11) // API key 11
@@ -486,20 +486,20 @@ func (h *Handler) handleApiVersions(correlationID uint32) ([]byte, error) {
 	response = append(response, 0, 0)  // min version 0
 	response = append(response, 0, 5)  // max version 5
 
-	// API Key 8 (OffsetCommit): api_key(2) + min_version(2) + max_version(2)
+	// API Key 8 (OffsetCommit): limit to v2 for current implementation
 	response = append(response, 0, 8) // API key 8
 	response = append(response, 0, 0) // min version 0
-	response = append(response, 0, 8) // max version 8
+	response = append(response, 0, 2) // max version 2
 
-	// API Key 9 (OffsetFetch): api_key(2) + min_version(2) + max_version(2)
+	// API Key 9 (OffsetFetch): limit to v2 (implemented and tested)
 	response = append(response, 0, 9) // API key 9
 	response = append(response, 0, 0) // min version 0
-	response = append(response, 0, 8) // max version 8
+	response = append(response, 0, 2) // max version 2
 
-	// API Key 10 (FindCoordinator): api_key(2) + min_version(2) + max_version(2)
+	// API Key 10 (FindCoordinator): limit to v2 (implemented)
 	response = append(response, 0, 10) // API key 10
 	response = append(response, 0, 0)  // min version 0
-	response = append(response, 0, 4)  // max version 4
+	response = append(response, 0, 2)  // max version 2
 
 	// API Key 12 (Heartbeat): api_key(2) + min_version(2) + max_version(2)
 	response = append(response, 0, 12) // API key 12
@@ -1691,15 +1691,15 @@ func (h *Handler) validateAPIVersion(apiKey, apiVersion uint16) error {
 		18: {0, 3},  // ApiVersions: v0-v3
 		3:  {0, 7},  // Metadata: v0-v7
 		0:  {0, 7},  // Produce: v0-v7
-		1:  {0, 11}, // Fetch: v0-v11
-		2:  {0, 5},  // ListOffsets: v0-v5
+		1:  {0, 7},  // Fetch: v0-v7
+		2:  {0, 2},  // ListOffsets: v0-v2
 		19: {0, 4},  // CreateTopics: v0-v4
 		20: {0, 4},  // DeleteTopics: v0-v4
-		10: {0, 4},  // FindCoordinator: v0-v4
+		10: {0, 2},  // FindCoordinator: v0-v2
 		11: {0, 7},  // JoinGroup: v0-v7
 		14: {0, 5},  // SyncGroup: v0-v5
-		8:  {0, 8},  // OffsetCommit: v0-v8
-		9:  {0, 8},  // OffsetFetch: v0-v8
+		8:  {0, 2},  // OffsetCommit: v0-v2
+		9:  {0, 2},  // OffsetFetch: v0-v2
 		12: {0, 4},  // Heartbeat: v0-v4
 		13: {0, 4},  // LeaveGroup: v0-v4
 	}