[common] upgrade the priority of request: GET_METADATA & UPDATE_METADATA

Author: swuferhong

fluss-rpc/src/main/java/com/alibaba/fluss/rpc/netty/server/RpcRequest.java

@@ -117,11 +117,12 @@ public long getStartTimeMs() {
      * stability of the cluster when the network load is high.
      */
     public int getPriority() {
-        if (apiKey == ApiKeys.FETCH_LOG.id
-                && ((FetchLogRequest) message).getFollowerServerId() >= 0) {
+        if ((apiKey == ApiKeys.FETCH_LOG.id
+                && ((FetchLogRequest) message).getFollowerServerId() >= 0)) {
             return 1;
+        } else if (apiKey == ApiKeys.GET_METADATA.id || apiKey == ApiKeys.UPDATE_METADATA.id) {
+            return 2;
         }
-
         return 0;
     }
 

fluss-server/src/test/java/com/alibaba/fluss/server/testutils/FlussClusterExtension.java

@@ -359,7 +359,7 @@ public TabletServerGateway newTabletServerClientForNode(int serverId) {
     public void waitUtilAllGatewayHasSameMetadata() {
         for (AdminReadOnlyGateway gateway : collectAllRpcGateways()) {
             retry(
-                    Duration.ofMinutes(1),
+                    Duration.ofMinutes(2),
                     () -> {
                         MetadataResponse response = gateway.metadata(new MetadataRequest()).get();
                         assertThat(response.hasCoordinatorServer()).isTrue();