feat(session_config): system wide session config by alter system set

e2e_test/ddl/alter_session_params.slt

@@ -0,0 +1,25 @@
+statement ok
+set RW_STREAMING_ENABLE_DELTA_JOIN to true;
+
+statement error session param query_mode cannot be altered system wide
+alter system set query_mode to auto;
+
+connection other1
+query T
+show RW_STREAMING_ENABLE_DELTA_JOIN;
+----
+false
+
+statement ok
+alter system set rw_streaming_enable_delta_join to true;
+
+sleep 1s
+
+connection other2
+query T
+show RW_STREAMING_ENABLE_DELTA_JOIN;
+----
+true
+
+statement ok
+alter system set RW_STREAMING_ENABLE_DELTA_JOIN to default;

e2e_test/error_ui/simple/main.slt

@@ -81,15 +81,3 @@ Caused by these errors (recent errors listed first):
   1: Failed to get/set session config
   2: Invalid value `maybe` for `rw_implicit_flush`
   3: Invalid bool
-
-
-statement error
-set transaction_isolation to 'read committed';
-----
-db error: ERROR: Failed to run the query
-
-Caused by these errors (recent errors listed first):
-  1: Failed to get/set session config
-  2: Invalid value `read committed` for `transaction_isolation`
-  3: Feature is not yet implemented: isolation level
-Tracking issue: https://github.com/risingwavelabs/risingwave/issues/10736

proto/meta.proto

@@ -386,6 +386,7 @@ message MetaSnapshot {
   repeated catalog.Connection connections = 17;
   repeated catalog.Subscription subscriptions = 19;
   repeated user.UserInfo users = 8;
+  GetSessionParamsResponse session_params = 20;
   // for streaming
   repeated FragmentParallelUnitMapping parallel_unit_mappings = 9;
   repeated common.WorkerNode nodes = 10;
@@ -430,6 +431,7 @@ message SubscribeResponse {
     catalog.Schema schema = 5;
     catalog.Function function = 6;
     user.UserInfo user = 11;
+    SetSessionParamRequest session_param = 25;
     // for streaming
     FragmentParallelUnitMapping parallel_unit_mapping = 12;
     common.WorkerNode node = 13;
@@ -593,6 +595,28 @@ service SystemParamsService {
   rpc SetSystemParam(SetSystemParamRequest) returns (SetSystemParamResponse);
 }
 
+message GetSessionParamsRequest {}
+
+message GetSessionParamsResponse {
+  string params = 1;
+}
+
+message SetSessionParamRequest {
+  string param = 1;
+  // None means set to default value.
+  optional string value = 2;
+}
+
+message SetSessionParamResponse {
+  string param = 1;
+}
+
+// Used for alter system wide default parameters
+service SessionParamService {
+  rpc GetSessionParams(GetSessionParamsRequest) returns (GetSessionParamsResponse);
+  rpc SetSessionParam(SetSessionParamRequest) returns (SetSessionParamResponse);
+}
+
 message GetServingVnodeMappingsRequest {}
 
 message GetServingVnodeMappingsResponse {

src/common/common_service/src/observer_manager.rs

@@ -156,7 +156,7 @@ where
             }
             Info::HummockSnapshot(_) => true,
             Info::MetaBackupManifestId(_) => true,
-            Info::SystemParams(_) => true,
+            Info::SystemParams(_) | Info::SessionParam(_) => true,
             Info::ServingParallelUnitMappings(_) => true,
             Info::Snapshot(_) | Info::HummockWriteLimits(_) => unreachable!(),
             Info::HummockStats(_) => true,

src/common/proc_macro/src/session_config.rs

@@ -40,7 +40,9 @@ pub(crate) fn derive_config(input: DeriveInput) -> TokenStream {
     let mut get_match_branches = vec![];
     let mut reset_match_branches = vec![];
     let mut show_all_list = vec![];
+    let mut list_all_list = vec![];
     let mut alias_to_entry_name_branches = vec![];
+    let mut entry_name_flags = vec![];
 
     for field in fields {
         let field_ident = field.ident.expect_or_abort("Field need to be named");
@@ -149,7 +151,7 @@ pub(crate) fn derive_config(input: DeriveInput) -> TokenStream {
                 &mut self,
                 val: &str,
                 reporter: &mut impl ConfigReporter
-            ) -> SessionConfigResult<()> {
+            ) -> SessionConfigResult<String> {
                 let val_t = #parse(val).map_err(|e| {
                     SessionConfigError::InvalidValue {
                         entry: #entry_name,
@@ -158,21 +160,20 @@ pub(crate) fn derive_config(input: DeriveInput) -> TokenStream {
                     }
                 })?;
 
-                self.#set_t_func_name(val_t, reporter)?;
-                Ok(())
+                self.#set_t_func_name(val_t, reporter).map(|val| val.to_string())
             }
 
             #[doc = #set_t_func_doc]
             pub fn #gen_set_func_name(
                 &mut self,
                 val: #ty,
                 reporter: &mut impl ConfigReporter
-            ) -> SessionConfigResult<()> {
+            ) -> SessionConfigResult<#ty> {
                 #check_hook
                 #report_hook
 
-                self.#field_ident = val;
-                Ok(())
+                self.#field_ident = val.clone();
+                Ok(val)
             }
 
         });
@@ -181,10 +182,11 @@ pub(crate) fn derive_config(input: DeriveInput) -> TokenStream {
         struct_impl_reset.push(quote! {
 
         #[allow(clippy::useless_conversion)]
-        pub fn #reset_func_name(&mut self, reporter: &mut impl ConfigReporter) {
+        pub fn #reset_func_name(&mut self, reporter: &mut impl ConfigReporter) -> String {
                 let val = #default;
                 #report_hook
                 self.#field_ident = val.into();
+                self.#field_ident.to_string()
             }
         });
 
@@ -224,20 +226,42 @@ pub(crate) fn derive_config(input: DeriveInput) -> TokenStream {
             #entry_name => Ok(self.#reset_func_name(reporter)),
         });
 
-        if !flags.contains(&"NO_SHOW_ALL") {
-            show_all_list.push(quote! {
-                VariableInfo {
-                    name: #entry_name.to_string(),
-                    setting: self.#field_ident.to_string(),
-                    description : #description.to_string(),
-                },
+        let var_info = quote! {
+            VariableInfo {
+                name: #entry_name.to_string(),
+                setting: self.#field_ident.to_string(),
+                description : #description.to_string(),
+            },
+        };
+        list_all_list.push(var_info.clone());
 
-            });
+        let no_show_all = flags.contains(&"NO_SHOW_ALL");
+        let no_show_all_flag: TokenStream = no_show_all.to_string().parse().unwrap();
+        if !no_show_all {
+            show_all_list.push(var_info);
         }
+
+        let no_alter_sys_flag: TokenStream =
+            flags.contains(&"NO_ALTER_SYS").to_string().parse().unwrap();
+
+        entry_name_flags.push(
+            quote! {
+                (#entry_name, ParamFlags {no_show_all: #no_show_all_flag, no_alter_sys: #no_alter_sys_flag})
+            }
+        );
     }
 
     let struct_ident = input.ident;
     quote! {
+        use std::collections::HashMap;
+        use std::sync::LazyLock;
+        static PARAM_NAME_FLAGS: LazyLock<HashMap<&'static str, ParamFlags>> = LazyLock::new(|| HashMap::from([#(#entry_name_flags, )*]));
+
+        struct ParamFlags {
+            no_show_all: bool,
+            no_alter_sys: bool,
+        }
+
         impl Default for #struct_ident {
             #[allow(clippy::useless_conversion)]
             fn default() -> Self {
@@ -252,11 +276,11 @@ pub(crate) fn derive_config(input: DeriveInput) -> TokenStream {
                 Default::default()
             }
 
-            fn alias_to_entry_name(key_name: &str) -> &str {
+            pub fn alias_to_entry_name(key_name: &str) -> String {
                 match key_name {
                     #(#alias_to_entry_name_branches)*
                     _ => key_name,
-                }
+                }.to_ascii_lowercase()
             }
 
             #(#struct_impl_get)*
@@ -266,9 +290,9 @@ pub(crate) fn derive_config(input: DeriveInput) -> TokenStream {
             #(#struct_impl_reset)*
 
             /// Set a parameter given it's name and value string.
-            pub fn set(&mut self, key_name: &str, value: String, reporter: &mut impl ConfigReporter) -> SessionConfigResult<()> {
+            pub fn set(&mut self, key_name: &str, value: String, reporter: &mut impl ConfigReporter) -> SessionConfigResult<String> {
                 let key_name = Self::alias_to_entry_name(key_name);
-                match key_name.to_ascii_lowercase().as_ref() {
+                match key_name.as_ref() {
                     #(#set_match_branches)*
                     _ => Err(SessionConfigError::UnrecognizedEntry(key_name.to_string())),
                 }
@@ -277,27 +301,47 @@ pub(crate) fn derive_config(input: DeriveInput) -> TokenStream {
             /// Get a parameter by it's name.
             pub fn get(&self, key_name: &str) -> SessionConfigResult<String> {
                 let key_name = Self::alias_to_entry_name(key_name);
-                match key_name.to_ascii_lowercase().as_ref() {
+                match key_name.as_ref() {
                     #(#get_match_branches)*
                     _ => Err(SessionConfigError::UnrecognizedEntry(key_name.to_string())),
                 }
             }
 
             /// Reset a parameter by it's name.
-            pub fn reset(&mut self, key_name: &str, reporter: &mut impl ConfigReporter) -> SessionConfigResult<()> {
+            pub fn reset(&mut self, key_name: &str, reporter: &mut impl ConfigReporter) -> SessionConfigResult<String> {
                 let key_name = Self::alias_to_entry_name(key_name);
-                match key_name.to_ascii_lowercase().as_ref() {
+                match key_name.as_ref() {
                     #(#reset_match_branches)*
                     _ => Err(SessionConfigError::UnrecognizedEntry(key_name.to_string())),
                 }
             }
 
-            /// Show all parameters.
+            /// Show all parameters except those specified `NO_SHOW_ALL`.
             pub fn show_all(&self) -> Vec<VariableInfo> {
                 vec![
                     #(#show_all_list)*
                 ]
             }
+
+            /// List all parameters
+            pub fn list_all(&self) -> Vec<VariableInfo> {
+                vec![
+                    #(#list_all_list)*
+                ]
+            }
+
+            /// Check if `SessionConfig` has a parameter.
+            pub fn contains_param(key_name: &str) -> bool {
+                let key_name = Self::alias_to_entry_name(key_name);
+                PARAM_NAME_FLAGS.contains_key(key_name.as_str())
+            }
+
+            /// Check if `SessionConfig` has a parameter.
+            pub fn check_no_alter_sys(key_name: &str) -> SessionConfigResult<bool> {
+                let key_name = Self::alias_to_entry_name(key_name);
+                let flags = PARAM_NAME_FLAGS.get(key_name.as_str()).ok_or_else(|| SessionConfigError::UnrecognizedEntry(key_name.to_string()))?;
+                Ok(flags.no_alter_sys)
+            }
         }
     }
 }

src/common/src/lib.rs

@@ -103,7 +103,7 @@ pub const RW_VERSION: &str = env!("CARGO_PKG_VERSION");
 /// Placeholder for unknown git sha.
 pub const UNKNOWN_GIT_SHA: &str = "unknown";
 
-// The single source of truth of the pg parameters, Used in ConfigMap and current_cluster_version.
+// The single source of truth of the pg parameters, Used in SessionConfig and current_cluster_version.
 // The version of PostgreSQL that Risingwave claims to be.
 pub const PG_VERSION: &str = "13.14.0";
 /// The version of PostgreSQL that Risingwave claims to be.