Fix: workaround cargo leaking SSL_CERT_FILE issue

On Linux: command `cargo run` pollutes environment variables: It leaks
`SSL_CERT_FILE` and `SSL_CERT_DIR` to the testing sub progress it runs.
Which cause `reqwest` spending ~50 ms loading the certificates for every
RPC.

We just extend the RPC timeout to work around.

- Fix: #550

examples/raft-kv-memstore/src/client.rs

@@ -170,7 +170,7 @@ impl ExampleClient {
         }
         .send();
 
-        let res = timeout(Duration::from_millis(500), fu).await;
+        let res = timeout(Duration::from_millis(3_000), fu).await;
         let resp = match res {
             Ok(x) => x.map_err(|e| RPCError::Network(NetworkError::new(&e)))?,
             Err(timeout_err) => {

examples/raft-kv-memstore/src/lib.rs

@@ -36,7 +36,14 @@ pub type ExampleRaft = Raft<ExampleTypeConfig, ExampleNetwork, Arc<ExampleStore>
 
 pub async fn start_example_raft_node(node_id: ExampleNodeId, http_addr: String) -> std::io::Result<()> {
     // Create a configuration for the raft instance.
-    let config = Arc::new(Config::default().validate().unwrap());
+    let config = Config {
+        heartbeat_interval: 500,
+        election_timeout_min: 1500,
+        election_timeout_max: 3000,
+        ..Default::default()
+    };
+
+    let config = Arc::new(config.validate().unwrap());
 
     // Create a instance of where the Raft data will be stored.
     let store = Arc::new(ExampleStore::default());

examples/raft-kv-memstore/tests/cluster/test_cluster.rs

@@ -209,7 +209,7 @@ async fn test_cluster() -> anyhow::Result<()> {
     println!("=== change-membership to 3, ");
     let _x = client.change_membership(&btreeset! {3}).await?;
 
-    tokio::time::sleep(Duration::from_millis(1_000)).await;
+    tokio::time::sleep(Duration::from_millis(8_000)).await;
 
     println!("=== metrics after change-membership to {{3}}");
     let x = client.metrics().await?;

openraft/src/core/raft_core.rs

@@ -1408,8 +1408,8 @@ impl<C: RaftTypeConfig, N: RaftNetworkFactory<C>, S: RaftStorage<C>> RaftCore<C,
 
         if session_id.membership_log_id != self.engine.state.membership_state.effective.log_id {
             tracing::warn!(
-                "membership_log_id changed: msg sent by: {:?}; curr: {}; ignore when ({})",
-                session_id.membership_log_id,
+                "membership_log_id changed: msg sent by: {}; curr: {}; ignore when ({})",
+                session_id.membership_log_id.summary(),
                 self.engine.state.membership_state.effective.log_id.summary(),
                 msg
             );