feat: optimize fuse client hang issue during multi-master failover

curvine-common/src/error/fs_error.rs

@@ -422,6 +422,10 @@ impl ErrorExt for FsError {
     fn should_retry(&self) -> bool {
         self.retry_master()
     }
+
+    fn should_continue(&self) -> bool {
+        matches!(self, FsError::NotLeaderMaster(_))
+    }
 }
 
 #[cfg(test)]

curvine-docker/deploy/example/conf/curvine-cluster.toml

@@ -36,6 +36,19 @@ master_addrs = [
     { hostname = "cv-master-2.svc.cluster.local", port = 8995 }
 ]
 
+# RPC timeout optimization for fast master failover
+# RPC timeout: 120s → 10s (Raft election takes 10-15s)
+rpc_timeout_ms = 10000
+
+# Total retry duration: 300s → 40s (10s × 3 nodes + retry intervals)
+rpc_retry_max_duration_ms = 40000
+
+# Minimum retry sleep: 300ms → 100ms (faster retry)
+rpc_retry_min_sleep_ms = 100
+
+# Maximum retry sleep: 30s → 2s (avoid long wait)
+rpc_retry_max_sleep_ms = 2000
+
 [fuse]
 debug = false
 

curvine-server/src/master/master_server.rs

@@ -245,6 +245,11 @@ impl Master {
         self.replication_manager.clone()
     }
 
+    // for test - get state controller to simulate server shutdown
+    pub fn new_state_ctl(&self) -> orpc::sync::StateCtl {
+        self.rpc_server.new_state_ctl()
+    }
+
     pub fn service(&self) -> &MasterService {
         self.rpc_server.service()
     }

curvine-server/src/test/mini_cluster.rs

@@ -18,15 +18,16 @@ use crate::master::Master;
 use crate::worker::Worker;
 use curvine_client::file::CurvineFileSystem;
 use curvine_common::conf::ClusterConf;
-use curvine_common::raft::{NodeId, RaftPeer};
+use curvine_common::error::FsError;
+use curvine_common::raft::{NodeId, RaftPeer, RoleState};
 use curvine_common::FsResult;
 use dashmap::DashMap;
 use log::info;
 use orpc::client::RpcClient;
 use orpc::common::LocalTime;
 use orpc::io::net::{InetAddr, NetUtils};
-use orpc::runtime::{RpcRuntime, Runtime};
-use orpc::{err_box, CommonResult};
+use orpc::runtime::Runtime;
+use orpc::{err_box, err_msg, CommonResult};
 use std::sync::Arc;
 use std::thread;
 use std::time::Duration;
@@ -82,20 +83,10 @@ impl MiniCluster {
 
     pub fn start_cluster(&self) {
         self.start_master();
-
-        // Wait for Master to be fully ready before starting Workers
-        self.client_rt.block_on(self.wait_master_ready()).unwrap();
-
-        // Add a small additional delay to ensure Master is fully stable
-        std::thread::sleep(Duration::from_millis(500));
-
-        self.start_worker();
-
-        self.client_rt.block_on(self.wait_ready()).unwrap();
     }
 
     /// Wait for Master service to be fully ready (Raft Leader + RPC service started)
-    async fn wait_master_ready(&self) -> FsResult<()> {
+    pub async fn wait_master_ready(&self) -> FsResult<()> {
         let wait_time = LocalTime::mills() + 60 * 1000; // 60 second timeout
         let mut retry_count = 0;
         let mut rpc_connection_attempted = false;
@@ -123,7 +114,6 @@ impl MiniCluster {
             }
 
             if raft_leader_ready {
-                // Additional check: try to create a simple RPC connection to verify the service is actually listening
                 let conf = self.master_conf().client_rpc_conf();
                 let addr = self.master_conf().master_addr();
 
@@ -154,7 +144,7 @@ impl MiniCluster {
     }
 
     /// Wait for the entire cluster to be ready (all Workers registered)
-    async fn wait_ready(&self) -> FsResult<()> {
+    pub async fn wait_ready(&self) -> FsResult<()> {
         let fs = self.new_fs();
         let wait_time = LocalTime::mills() + 20 * 1000; // 20 second timeout
         let mut retry_count = 0;
@@ -225,6 +215,146 @@ impl MiniCluster {
             .unwrap()
     }
 
+    /// Get the index of the currently active master
+    pub fn get_active_master_index(&self) -> Option<usize> {
+        self.master_entries
+            .iter()
+            .find(|x| x.0.master_monitor.is_active())
+            .map(|x| *x.key())
+    }
+
+    /// Wait for cluster to be fully ready (Master + Workers)
+    pub async fn wait_cluster_ready(&self) -> FsResult<()> {
+        // Wait for master to be ready
+        self.wait_master_ready().await?;
+
+        // Wait for workers to register
+        self.wait_ready().await?;
+
+        Ok(())
+    }
+
+    /// Kill the currently active master
+    pub fn kill_active_master(&self) -> FsResult<()> {
+        let active_idx = self
+            .get_active_master_index()
+            .ok_or_else(|| FsError::common(err_msg!("No active master found")))?;
+        self.kill_master(active_idx)
+    }
+
+    /// Kill a master at the specified index
+    pub fn kill_master(&self, index: usize) -> FsResult<()> {
+        let entry = self
+            .master_entries
+            .get(&index)
+            .ok_or_else(|| FsError::common(err_msg!("Master at index {} not found", index)))?;
+
+        info!("Killing master at index {}", index);
+
+        // Set Raft role state to Exit to immediately mark as inactive
+        entry
+            .0
+            .master_monitor
+            .journal_ctl
+            .set_state(RoleState::Exit);
+
+        info!(
+            "Master at index {} has been killed (Raft role set to Exit)",
+            index
+        );
+        Ok(())
+    }
+
+    /// Wait for a new master to be elected after killing the old one
+    pub async fn wait_for_new_master(
+        &self,
+        timeout_secs: u64,
+        old_master_idx: Option<usize>,
+    ) -> FsResult<usize> {
+        let wait_time = LocalTime::mills() + (timeout_secs * 1000);
+        let mut retry_count = 0;
+
+        info!(
+            "Waiting for new master election (timeout: {}s)...",
+            timeout_secs
+        );
+
+        // Step 1: Wait for old master to become inactive (if specified)
+        if let Some(old_idx) = old_master_idx {
+            info!(
+                "Step 1: Waiting for old master (index {}) to become inactive...",
+                old_idx
+            );
+            while LocalTime::mills() <= wait_time {
+                retry_count += 1;
+
+                if let Some(entry) = self.master_entries.get(&old_idx) {
+                    if !entry.0.master_monitor.is_active() {
+                        info!("Old master (index {}) is now inactive", old_idx);
+                        break;
+                    }
+                } else {
+                    // Master entry removed, consider it inactive
+                    info!("Old master (index {}) entry removed", old_idx);
+                    break;
+                }
+
+                if retry_count % 10 == 0 {
+                    info!(
+                        "Still waiting for old master to become inactive... (attempt {})",
+                        retry_count
+                    );
+                }
+                tokio::time::sleep(Duration::from_millis(500)).await;
+            }
+        }
+
+        // Step 2: Wait for new master to be elected
+        info!("Step 2: Waiting for new master to be elected...");
+        retry_count = 0;
+        while LocalTime::mills() <= wait_time {
+            retry_count += 1;
+
+            // Check all masters to find a new active one
+            for entry in self.master_entries.iter() {
+                let idx = *entry.key();
+                let is_active = entry.0.master_monitor.is_active();
+
+                // If we're looking for a different master, verify it's not the old one
+                if is_active && (old_master_idx != Some(idx)) {
+                    info!(
+                        "New master elected at index {} (attempt {})",
+                        idx, retry_count
+                    );
+                    return Ok(idx);
+                }
+            }
+
+            if retry_count % 10 == 0 {
+                info!(
+                    "Still waiting for new master election... (attempt {})",
+                    retry_count
+                );
+            }
+            tokio::time::sleep(Duration::from_millis(500)).await;
+        }
+
+        err_box!(
+            "New master election timeout after {}s (attempt {})",
+            timeout_secs,
+            retry_count
+        )
+    }
+
+    /// Check if a master at the specified index is running
+    pub fn is_master_running(&self, index: usize) -> bool {
+        if let Some(entry) = self.master_entries.get(&index) {
+            entry.0.master_monitor.is_active()
+        } else {
+            false
+        }
+    }
+
     // Create the default master node configuration.
     // Multiple masters can be created
     fn default_master_conf(conf: &ClusterConf, num: u16) -> Vec<ClusterConf> {

curvine-server/src/worker/worker_server.rs

@@ -213,6 +213,11 @@ impl Worker {
         self.rpc_server.service()
     }
 
+    // for test - get state controller to simulate server shutdown
+    pub fn new_state_ctl(&self) -> orpc::sync::StateCtl {
+        self.rpc_server.new_state_ctl()
+    }
+
     #[cfg(target_os = "linux")]
     async fn start_s3_gateway(mut conf: ClusterConf, worker_rt: Arc<Runtime>) {
         let listen_addr = conf.s3_gateway.listen.clone();