perf(storage): optimize internode RPC transfer path (#2262)

Co-authored-by: momoda693 <momoda693@gmail.com>

crates/iam/src/manager.rs

@@ -25,6 +25,7 @@ use crate::{
 };
 use futures::future::join_all;
 use rustfs_credentials::{Credentials, EMBEDDED_POLICY_TYPE, INHERITED_POLICY_TYPE, get_global_action_cred};
+use rustfs_ecstore::global::is_first_cluster_node_local;
 use rustfs_madmin::{AccountStatus, AddOrUpdateUserReq, GroupDesc};
 use rustfs_policy::{
     arn::ARN,
@@ -303,6 +304,10 @@ where
             return Ok(());
         }
 
+        if !is_first_cluster_node_local().await {
+            return Ok(());
+        }
+
         self.api.save_iam_config(IAMFormat::new_version_1(), path).await
     }
     pub async fn get_user(&self, access_key: &str) -> Option<UserIdentity> {

crates/iam/src/store/object.rs

@@ -25,7 +25,7 @@ use rustfs_ecstore::store_api::{ListOperations as _, ObjectInfoOrErr, WalkOption
 use rustfs_ecstore::{
     config::{
         RUSTFS_CONFIG_PREFIX,
-        com::{delete_config, read_config, read_config_with_metadata, save_config},
+        com::{delete_config, read_config, read_config_no_lock, read_config_with_metadata, save_config},
     },
     store::ECStore,
     store_api::{ObjectInfo, ObjectOptions},
@@ -391,7 +391,7 @@ impl ObjectStore {
         // If it doesn't exist, the system bucket or metadata is not ready.
         let probe_path = format!("{}/format.json", *IAM_CONFIG_PREFIX);
 
-        match read_config(self.object_api.clone(), &probe_path).await {
+        match read_config_no_lock(self.object_api.clone(), &probe_path).await {
             Ok(_) => Ok(()),
             Err(rustfs_ecstore::error::StorageError::ConfigNotFound) => Err(Error::other(format!(
                 "Storage metadata not ready: probe object '{}' not found (expected IAM config to be initialized)",