diff --git a/lib/AppLoader.d.ts b/lib/AppLoader.d.ts
index ffd9144..3d31f9a 100644
--- a/lib/AppLoader.d.ts
+++ b/lib/AppLoader.d.ts
@@ -1,24 +1,24 @@
 /// <reference types="node" />
 import { EntityDict as BaseEntityDict } from 'oak-domain/lib/base-app-domain';
-import { AppLoader as GeneralAppLoader, EntityDict, OpRecord } from "oak-domain/lib/types";
+import { AppLoader as GeneralAppLoader, Trigger, EntityDict, Watcher, OpRecord } from "oak-domain/lib/types";
 import { DbStore } from "./DbStore";
 import { BackendRuntimeContext } from 'oak-frontend-base';
 import { IncomingHttpHeaders, IncomingMessage } from 'http';
 import { Namespace } from 'socket.io';
-import { ClusterInfo } from 'oak-domain/lib/types/Cluster';
 export declare class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends BackendRuntimeContext<ED>> extends GeneralAppLoader<ED, Cxt> {
-    private dbStore;
+    protected dbStore: DbStore<ED, Cxt>;
     private aspectDict;
     private externalDependencies;
     private dataSubscriber?;
-    private contextBuilder;
+    protected contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>) => Promise<Cxt>;
     private requireSth;
-    constructor(path: string, contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>, header?: IncomingHttpHeaders, clusterInfo?: ClusterInfo) => Promise<Cxt>, ns?: Namespace);
+    private makeContext;
+    constructor(path: string, contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>) => Promise<Cxt>, ns?: Namespace);
+    protected registerTrigger(trigger: Trigger<ED, keyof ED, Cxt>): void;
     initTriggers(): void;
-    startWatchers(): void;
     mount(initialize?: true): Promise<void>;
     unmount(): Promise<void>;
-    execAspect(name: string, header?: IncomingHttpHeaders, contextString?: string, params?: any): Promise<{
+    execAspect(name: string, headers?: IncomingHttpHeaders, contextString?: string, params?: any): Promise<{
         opRecords: OpRecord<ED>[];
         result: any;
         message?: string;
@@ -26,6 +26,10 @@ export declare class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt exten
     initialize(dropIfExists?: boolean): Promise<void>;
     getStore(): DbStore<ED, Cxt>;
     getEndpoints(prefix: string): [string, "get" | "post" | "put" | "delete", string, (params: Record<string, string>, headers: IncomingHttpHeaders, req: IncomingMessage, body?: any) => Promise<any>][];
+    protected operateInWatcher<T extends keyof ED>(entity: T, operation: ED[T]['Update'], context: Cxt): Promise<import("oak-domain/lib/types").OperationResult<ED>>;
+    protected selectInWatcher<T extends keyof ED>(entity: T, selection: ED[T]['Selection'], context: Cxt): Promise<Partial<ED[T]["Schema"]>[]>;
+    protected execWatcher(watcher: Watcher<ED, keyof ED, Cxt>): Promise<void>;
+    startWatchers(): void;
     startTimers(): void;
     execStartRoutines(): Promise<void>;
     execRoutine(routine: (context: Cxt) => Promise<void>): Promise<void>;
diff --git a/lib/AppLoader.js b/lib/AppLoader.js
index a735cd8..f805d2f 100644
--- a/lib/AppLoader.js
+++ b/lib/AppLoader.js
@@ -86,6 +86,12 @@ class AppLoader extends types_1.AppLoader {
         Object.assign(sthOut, sth);
         return sthOut;
     }
+    async makeContext(cxtStr, headers) {
+        const context = await this.contextBuilder(cxtStr)(this.dbStore);
+        context.clusterInfo = (0, env_2.getClusterInfo)();
+        context.headers = headers;
+        return context;
+    }
     constructor(path, contextBuilder, ns) {
         super(path);
         const dbConfig = require((0, path_1.join)(path, '/configuration/mysql.json'));
@@ -96,8 +102,8 @@ class AppLoader extends types_1.AppLoader {
         this.dbStore = new DbStore_1.DbStore(storageSchema, contextBuilder, dbConfig, authDeduceRelationMap, selectFreeEntities, updateFreeDict);
         if (ns) {
             this.dataSubscriber = new DataSubscriber_1.default(ns, (scene) => this.contextBuilder(scene)(this.dbStore));
-            this.contextBuilder = (scene) => async (store, header, clusterInfo) => {
-                const context = await contextBuilder(scene)(store, header, clusterInfo);
+            this.contextBuilder = (scene) => async (store) => {
+                const context = await contextBuilder(scene)(store);
                 // 注入在提交前向dataSubscribe
                 const originCommit = context.commit;
                 context.commit = async () => {
@@ -117,79 +123,19 @@ class AppLoader extends types_1.AppLoader {
             this.contextBuilder = contextBuilder;
         }
     }
+    registerTrigger(trigger) {
+        this.dbStore.registerTrigger(trigger);
+    }
     initTriggers() {
         const triggers = this.requireSth('lib/triggers/index');
         const checkers = this.requireSth('lib/checkers/index');
         const { ActionDefDict } = require(`${this.path}/lib/oak-app-domain/ActionDefDict`);
         const { triggers: adTriggers, checkers: adCheckers } = (0, actionDef_1.makeIntrinsicCTWs)(this.dbStore.getSchema(), ActionDefDict);
-        triggers.forEach((trigger) => this.dbStore.registerTrigger(trigger));
-        adTriggers.forEach((trigger) => this.dbStore.registerTrigger(trigger));
+        triggers.forEach((trigger) => this.registerTrigger(trigger));
+        adTriggers.forEach((trigger) => this.registerTrigger(trigger));
         checkers.forEach((checker) => this.dbStore.registerChecker(checker));
         adCheckers.forEach((checker) => this.dbStore.registerChecker(checker));
     }
-    startWatchers() {
-        const watchers = this.requireSth('lib/watchers/index');
-        const { ActionDefDict } = require(`${this.path}/lib/oak-app-domain/ActionDefDict`);
-        const { watchers: adWatchers } = (0, actionDef_1.makeIntrinsicCTWs)(this.dbStore.getSchema(), ActionDefDict);
-        const totalWatchers = watchers.concat(adWatchers);
-        let count = 0;
-        const doWatchers = async () => {
-            count++;
-            const start = Date.now();
-            const context = await this.contextBuilder()(this.dbStore, undefined, (0, env_2.getClusterInfo)());
-            for (const w of totalWatchers) {
-                await context.begin();
-                try {
-                    if (w.hasOwnProperty('actionData')) {
-                        const { entity, action, filter, actionData } = w;
-                        const filter2 = typeof filter === 'function' ? await filter() : filter;
-                        const data = typeof actionData === 'function' ? await actionData() : actionData; // 这里有个奇怪的编译错误，不理解 by Xc
-                        const result = await this.dbStore.operate(entity, {
-                            id: await (0, uuid_1.generateNewIdAsync)(),
-                            action,
-                            data,
-                            filter: filter2
-                        }, context, {
-                            dontCollect: true,
-                        });
-                        console.log(`执行了watcher【${w.name}】，结果是：`, result);
-                    }
-                    else {
-                        const { entity, projection, fn, filter } = w;
-                        const filter2 = typeof filter === 'function' ? await filter() : filter;
-                        const projection2 = typeof projection === 'function' ? await projection() : projection;
-                        const rows = await this.dbStore.select(entity, {
-                            data: projection2,
-                            filter: filter2,
-                        }, context, {
-                            dontCollect: true,
-                            blockTrigger: true,
-                        });
-                        if (rows.length > 0) {
-                            const result = await fn(context, rows);
-                            console.log(`执行了watcher【${w.name}】，结果是：`, result);
-                        }
-                    }
-                    await context.commit();
-                }
-                catch (err) {
-                    await context.rollback();
-                    console.error(`执行了watcher【${w.name}】，发生错误：`, err);
-                }
-            }
-            const duration = Date.now() - start;
-            console.log(`第${count}次执行watchers，共执行${watchers.length}个，耗时${duration}毫秒`);
-            const now = Date.now();
-            try {
-                await this.dbStore.checkpoint(process.env.NODE_ENV === 'development' ? now - 30 * 1000 : now - 120 * 1000);
-            }
-            catch (err) {
-                console.error(`执行了checkpoint，发生错误：`, err);
-            }
-            setTimeout(() => doWatchers(), 120000);
-        };
-        doWatchers();
-    }
     async mount(initialize) {
         const { path } = this;
         if (!initialize) {
@@ -203,8 +149,8 @@ class AppLoader extends types_1.AppLoader {
         (0, index_1.clearPorts)();
         this.dbStore.disconnect();
     }
-    async execAspect(name, header, contextString, params) {
-        const context = await this.contextBuilder(contextString)(this.dbStore, header, (0, env_2.getClusterInfo)());
+    async execAspect(name, headers, contextString, params) {
+        const context = await this.makeContext(contextString, headers);
         const fn = this.aspectDict[name];
         if (!fn) {
             throw new Error(`不存在的接口名称: ${name}`);
@@ -278,7 +224,7 @@ class AppLoader extends types_1.AppLoader {
                 }
             }
             endPointRouters.push([name, method, url, async (params, headers, req, body) => {
-                    const context = await this.contextBuilder()(this.dbStore, headers, (0, env_2.getClusterInfo)());
+                    const context = await this.makeContext(undefined, headers);
                     await context.begin();
                     try {
                         const result = await fn(context, params, headers, req, body);
@@ -303,18 +249,96 @@ class AppLoader extends types_1.AppLoader {
         }
         return endPointRouters;
     }
+    operateInWatcher(entity, operation, context) {
+        return this.dbStore.operate(entity, operation, context, {
+            dontCollect: true,
+        });
+    }
+    selectInWatcher(entity, selection, context) {
+        return this.dbStore.select(entity, selection, context, {
+            dontCollect: true,
+            blockTrigger: true,
+        });
+    }
+    async execWatcher(watcher) {
+        const context = await this.makeContext();
+        await context.begin();
+        try {
+            if (watcher.hasOwnProperty('actionData')) {
+                const { entity, action, filter, actionData } = watcher;
+                const filter2 = typeof filter === 'function' ? await filter() : filter;
+                const data = typeof actionData === 'function' ? await (actionData)() : actionData;
+                const result = await this.operateInWatcher(entity, {
+                    id: await (0, uuid_1.generateNewIdAsync)(),
+                    action,
+                    data,
+                    filter: filter2
+                }, context);
+                console.log(`执行了watcher【${watcher.name}】，结果是：`, result);
+            }
+            else {
+                const { entity, projection, fn, filter } = watcher;
+                const filter2 = typeof filter === 'function' ? await filter() : filter;
+                const projection2 = typeof projection === 'function' ? await projection() : projection;
+                const rows = await this.selectInWatcher(entity, {
+                    data: projection2,
+                    filter: filter2,
+                }, context);
+                if (rows.length > 0) {
+                    const result = await fn(context, rows);
+                    console.log(`执行了watcher【${watcher.name}】，结果是：`, result);
+                }
+            }
+            await context.commit();
+        }
+        catch (err) {
+            await context.rollback();
+            console.error(`执行了watcher【${watcher.name}】，发生错误：`, err);
+        }
+    }
+    startWatchers() {
+        const watchers = this.requireSth('lib/watchers/index');
+        const { ActionDefDict } = require(`${this.path}/lib/oak-app-domain/ActionDefDict`);
+        const { watchers: adWatchers } = (0, actionDef_1.makeIntrinsicCTWs)(this.dbStore.getSchema(), ActionDefDict);
+        const totalWatchers = watchers.concat(adWatchers);
+        let count = 0;
+        const doWatchers = async () => {
+            count++;
+            const start = Date.now();
+            for (const w of totalWatchers) {
+                await this.execWatcher(w);
+            }
+            const duration = Date.now() - start;
+            console.log(`第${count}次执行watchers，共执行${watchers.length}个，耗时${duration}毫秒`);
+            const now = Date.now();
+            try {
+                await this.dbStore.checkpoint(process.env.NODE_ENV === 'development' ? now - 30 * 1000 : now - 120 * 1000);
+            }
+            catch (err) {
+                console.error(`执行了checkpoint，发生错误：`, err);
+            }
+            setTimeout(() => doWatchers(), 120000);
+        };
+        doWatchers();
+    }
     startTimers() {
         const timers = this.requireSth('lib/timers/index');
         for (const timer of timers) {
-            const { cron, fn, name } = timer;
+            const { cron, name } = timer;
             (0, node_schedule_1.scheduleJob)(name, cron, async (date) => {
                 const start = Date.now();
-                const context = await this.contextBuilder()(this.dbStore, undefined, (0, env_2.getClusterInfo)());
+                const context = await this.makeContext();
                 await context.begin();
                 console.log(`定时器【${name}】开始执行，时间是【${date.toLocaleTimeString()}】`);
                 try {
-                    const result = await fn(context);
-                    console.log(`定时器【${name}】执行完成，耗时${Date.now() - start}毫秒，结果是【${result}】`);
+                    if (timer.hasOwnProperty('entity')) {
+                        await this.execWatcher(timer);
+                    }
+                    else {
+                        const { timer: timerFn } = timer;
+                        const result = await timerFn(context);
+                        console.log(`定时器【${name}】执行完成，耗时${Date.now() - start}毫秒，结果是【${result}】`);
+                    }
                     await context.commit();
                 }
                 catch (err) {
@@ -327,23 +351,28 @@ class AppLoader extends types_1.AppLoader {
     async execStartRoutines() {
         const routines = this.requireSth('lib/routines/start');
         for (const routine of routines) {
-            const { name, fn } = routine;
-            const context = await this.contextBuilder()(this.dbStore, undefined, (0, env_2.getClusterInfo)());
-            const start = Date.now();
-            await context.begin();
-            try {
-                const result = await fn(context);
-                console.log(`例程【${name}】执行完成，耗时${Date.now() - start}毫秒，结果是【${result}】`);
-                await context.commit();
+            if (routine.hasOwnProperty('entity')) {
+                this.execWatcher(routine);
             }
-            catch (err) {
-                console.warn(`例程【${name}】执行失败，耗时${Date.now() - start}毫秒，错误是`, err);
-                await context.rollback();
+            else {
+                const { name, routine: routineFn } = routine;
+                const context = await this.makeContext();
+                const start = Date.now();
+                await context.begin();
+                try {
+                    const result = await routineFn(context);
+                    console.log(`例程【${name}】执行完成，耗时${Date.now() - start}毫秒，结果是【${result}】`);
+                    await context.commit();
+                }
+                catch (err) {
+                    console.warn(`例程【${name}】执行失败，耗时${Date.now() - start}毫秒，错误是`, err);
+                    await context.rollback();
+                }
             }
         }
     }
     async execRoutine(routine) {
-        const context = await this.contextBuilder()(this.dbStore, undefined, (0, env_2.getClusterInfo)());
+        const context = await this.makeContext();
         await routine(context);
     }
 }
diff --git a/lib/ClusterAppLoader.d.ts b/lib/ClusterAppLoader.d.ts
new file mode 100644
index 0000000..8240b54
--- /dev/null
+++ b/lib/ClusterAppLoader.d.ts
@@ -0,0 +1,11 @@
+import { EntityDict as BaseEntityDict } from 'oak-domain/lib/base-app-domain';
+import { EntityDict, OperationResult } from 'oak-domain/lib/types';
+import { BackendRuntimeContext } from 'oak-frontend-base';
+import { AppLoader } from './AppLoader';
+import { DbStore } from './DbStore';
+import { Namespace } from 'socket.io';
+export declare class ClusterAppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends BackendRuntimeContext<ED>> extends AppLoader<ED, Cxt> {
+    constructor(path: string, contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>) => Promise<Cxt>, ns?: Namespace);
+    protected operateInWatcher<T extends keyof ED>(entity: T, operation: ED[T]['Update'], context: Cxt): Promise<OperationResult<ED>>;
+    protected selectInWatcher<T extends keyof ED>(entity: T, selection: ED[T]['Selection'], context: Cxt): Promise<Partial<ED[T]['Schema']>[]>;
+}
diff --git a/lib/ClusterAppLoader.js b/lib/ClusterAppLoader.js
new file mode 100644
index 0000000..e99830a
--- /dev/null
+++ b/lib/ClusterAppLoader.js
@@ -0,0 +1,59 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.ClusterAppLoader = void 0;
+const tslib_1 = require("tslib");
+const filter_1 = require("oak-domain/lib/store/filter");
+const env_1 = require("./cluster/env");
+const AppLoader_1 = require("./AppLoader");
+const assert_1 = tslib_1.__importDefault(require("assert"));
+class ClusterAppLoader extends AppLoader_1.AppLoader {
+    constructor(path, contextBuilder, ns) {
+        super(path, contextBuilder, ns);
+        this.dbStore.setOnVolatileTrigger(async (entity, trigger, ids, cxtStr, option) => {
+            if (trigger.cs) {
+                // 如果是cluster sensative的触发器，需要发送到相应的instance上被处理
+            }
+            else {
+                const context = await this.contextBuilder(cxtStr)(this.dbStore);
+                await context.begin();
+                try {
+                    await this.dbStore.execVolatileTrigger(entity, trigger.name, ids, context, option);
+                    await context.commit();
+                }
+                catch (err) {
+                    await context.rollback();
+                    console.error('execVolatileTrigger异常', entity, trigger.name, ids, option, err);
+                }
+            }
+        });
+    }
+    operateInWatcher(entity, operation, context) {
+        const { instanceCount, instanceId } = (0, env_1.getClusterInfo)();
+        (0, assert_1.default)(instanceCount && typeof instanceId === 'number');
+        const { filter } = operation;
+        const filter2 = (0, filter_1.combineFilters)(entity, this.dbStore.getSchema(), [filter, {
+                $$seq$$: {
+                    $mod: [instanceCount, instanceId]
+                }
+            }]);
+        return super.operateInWatcher(entity, {
+            ...operation,
+            filter: filter2,
+        }, context);
+    }
+    selectInWatcher(entity, selection, context) {
+        const { instanceCount, instanceId } = (0, env_1.getClusterInfo)();
+        (0, assert_1.default)(instanceCount && typeof instanceId === 'number');
+        const { filter } = selection;
+        const filter2 = (0, filter_1.combineFilters)(entity, this.dbStore.getSchema(), [filter, {
+                $$seq$$: {
+                    $mod: [instanceCount, instanceId]
+                }
+            }]);
+        return super.selectInWatcher(entity, {
+            ...selection,
+            filter: filter2,
+        }, context);
+    }
+}
+exports.ClusterAppLoader = ClusterAppLoader;
diff --git a/lib/DbStore.d.ts b/lib/DbStore.d.ts
index e7c4879..7d3cea8 100644
--- a/lib/DbStore.d.ts
+++ b/lib/DbStore.d.ts
@@ -1,5 +1,5 @@
 import { MysqlStore, MySqlSelectOption, MysqlOperateOption } from 'oak-db';
-import { EntityDict, StorageSchema, Trigger, Checker, SelectOption, SelectFreeEntities, UpdateFreeDict, AuthDeduceRelationMap } from 'oak-domain/lib/types';
+import { EntityDict, StorageSchema, Trigger, Checker, SelectOption, SelectFreeEntities, UpdateFreeDict, AuthDeduceRelationMap, VolatileTrigger, OperateOption } from 'oak-domain/lib/types';
 import { EntityDict as BaseEntityDict } from 'oak-domain/lib/base-app-domain';
 import { MySQLConfiguration } from 'oak-db/lib/MySQL/types/Configuration';
 import { BackendRuntimeContext } from 'oak-frontend-base';
@@ -7,12 +7,14 @@ import { AsyncContext, AsyncRowStore } from 'oak-domain/lib/store/AsyncRowStore'
 export declare class DbStore<ED extends EntityDict & BaseEntityDict, Cxt extends BackendRuntimeContext<ED>> extends MysqlStore<ED, Cxt> implements AsyncRowStore<ED, Cxt> {
     private executor;
     private relationAuth;
-    constructor(storageSchema: StorageSchema<ED>, contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>) => Promise<Cxt>, mysqlConfiguration: MySQLConfiguration, authDeduceRelationMap: AuthDeduceRelationMap<ED>, selectFreeEntities?: SelectFreeEntities<ED>, updateFreeDict?: UpdateFreeDict<ED>);
+    constructor(storageSchema: StorageSchema<ED>, contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>) => Promise<Cxt>, mysqlConfiguration: MySQLConfiguration, authDeduceRelationMap: AuthDeduceRelationMap<ED>, selectFreeEntities?: SelectFreeEntities<ED>, updateFreeDict?: UpdateFreeDict<ED>, onVolatileTrigger?: <T extends keyof ED>(entity: T, trigger: VolatileTrigger<ED, T, Cxt>, ids: string[], cxtStr: string, option: OperateOption) => Promise<void>);
     protected cascadeUpdateAsync<T extends keyof ED>(entity: T, operation: ED[T]['Operation'], context: AsyncContext<ED>, option: MysqlOperateOption): Promise<import("oak-domain/lib/types").OperationResult<ED>>;
     operate<T extends keyof ED>(entity: T, operation: ED[T]['Operation'], context: Cxt, option: MysqlOperateOption): Promise<import("oak-domain/lib/types").OperationResult<ED>>;
     select<T extends keyof ED>(entity: T, selection: ED[T]['Selection'], context: Cxt, option: MySqlSelectOption): Promise<Partial<ED[T]["Schema"]>[]>;
     count<T extends keyof ED>(entity: T, selection: Pick<ED[T]['Selection'], 'filter' | 'count'>, context: Cxt, option: SelectOption): Promise<number>;
     registerTrigger<T extends keyof ED>(trigger: Trigger<ED, T, Cxt>): void;
     registerChecker<T extends keyof ED>(checker: Checker<ED, T, Cxt>): void;
+    setOnVolatileTrigger(onVolatileTrigger: <T extends keyof ED>(entity: T, trigger: VolatileTrigger<ED, T, Cxt>, ids: string[], cxtStr: string, option: OperateOption) => Promise<void>): void;
+    execVolatileTrigger<T extends keyof ED>(entity: T, name: string, ids: string[], context: Cxt, option: OperateOption): Promise<void>;
     checkpoint(ts: number): Promise<number>;
 }
diff --git a/lib/DbStore.js b/lib/DbStore.js
index f5b955c..1cf1058 100644
--- a/lib/DbStore.js
+++ b/lib/DbStore.js
@@ -7,9 +7,9 @@ const RelationAuth_1 = require("oak-domain/lib/store/RelationAuth");
 class DbStore extends oak_db_1.MysqlStore {
     executor;
     relationAuth;
-    constructor(storageSchema, contextBuilder, mysqlConfiguration, authDeduceRelationMap, selectFreeEntities = [], updateFreeDict = {}) {
+    constructor(storageSchema, contextBuilder, mysqlConfiguration, authDeduceRelationMap, selectFreeEntities = [], updateFreeDict = {}, onVolatileTrigger) {
         super(storageSchema, mysqlConfiguration);
-        this.executor = new TriggerExecutor_1.TriggerExecutor((scene) => contextBuilder(scene)(this));
+        this.executor = new TriggerExecutor_1.TriggerExecutor((scene) => contextBuilder(scene)(this), undefined, onVolatileTrigger);
         this.relationAuth = new RelationAuth_1.RelationAuth(storageSchema, authDeduceRelationMap, selectFreeEntities, updateFreeDict);
     }
     async cascadeUpdateAsync(entity, operation, context, option) {
@@ -109,6 +109,12 @@ class DbStore extends oak_db_1.MysqlStore {
     registerChecker(checker) {
         this.executor.registerChecker(checker);
     }
+    setOnVolatileTrigger(onVolatileTrigger) {
+        this.executor.setOnVolatileTrigger(onVolatileTrigger);
+    }
+    async execVolatileTrigger(entity, name, ids, context, option) {
+        return this.executor.execVolatileTrigger(entity, name, ids, context, option);
+    }
     checkpoint(ts) {
         return this.executor.checkpoint(ts);
     }
diff --git a/lib/index.d.ts b/lib/index.d.ts
index d055f14..f7829b6 100644
--- a/lib/index.d.ts
+++ b/lib/index.d.ts
@@ -1,2 +1,3 @@
 export { AppLoader } from './AppLoader';
+export { ClusterAppLoader } from './ClusterAppLoader';
 export * from './cluster/env';
diff --git a/lib/index.js b/lib/index.js
index 491b075..50cc114 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -1,7 +1,9 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.AppLoader = void 0;
+exports.ClusterAppLoader = exports.AppLoader = void 0;
 const tslib_1 = require("tslib");
 var AppLoader_1 = require("./AppLoader");
 Object.defineProperty(exports, "AppLoader", { enumerable: true, get: function () { return AppLoader_1.AppLoader; } });
+var ClusterAppLoader_1 = require("./ClusterAppLoader");
+Object.defineProperty(exports, "ClusterAppLoader", { enumerable: true, get: function () { return ClusterAppLoader_1.ClusterAppLoader; } });
 tslib_1.__exportStar(require("./cluster/env"), exports);
diff --git a/src/AppLoader.ts b/src/AppLoader.ts
index cff1c5d..1d36513 100644
--- a/src/AppLoader.ts
+++ b/src/AppLoader.ts
@@ -6,7 +6,7 @@ import { makeIntrinsicCTWs } from "oak-domain/lib/store/actionDef";
 import { intersection, omit } from 'oak-domain/lib/utils/lodash';
 import { EntityDict as BaseEntityDict } from 'oak-domain/lib/base-app-domain';
 import { generateNewIdAsync } from 'oak-domain/lib/utils/uuid';
-import { AppLoader as GeneralAppLoader, Trigger, Checker, Aspect, CreateOpResult, Context, EntityDict, Watcher, BBWatcher, WBWatcher, OpRecord } from "oak-domain/lib/types";
+import { AppLoader as GeneralAppLoader, Trigger, Checker, Aspect, CreateOpResult, Context, EntityDict, Watcher, BBWatcher, WBWatcher, OpRecord, Routine, FreeRoutine, Timer, FreeTimer, StorageSchema } from "oak-domain/lib/types";
 import { DbStore } from "./DbStore";
 import generalAspectDict, { clearPorts, registerPorts } from 'oak-common-aspect/lib/index';
 import { MySQLConfiguration } from 'oak-db/lib/MySQL/types/Configuration';
@@ -17,16 +17,15 @@ import { IncomingHttpHeaders, IncomingMessage } from 'http';
 import { Server as SocketIoServer, Namespace } from 'socket.io';
 
 import DataSubscriber from './cluster/DataSubscriber';
-import { ClusterInfo } from 'oak-domain/lib/types/Cluster';
 import { getClusterInfo } from './cluster/env';
 
 
 export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends BackendRuntimeContext<ED>> extends GeneralAppLoader<ED, Cxt> {
-    private dbStore: DbStore<ED, Cxt>;
+    protected dbStore: DbStore<ED, Cxt>;
     private aspectDict: Record<string, Aspect<ED, Cxt>>;
     private externalDependencies: string[];
     private dataSubscriber?: DataSubscriber<ED, Cxt>;
-    private contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>, header?: IncomingHttpHeaders, clusterInfo?: ClusterInfo) => Promise<Cxt>;
+    protected contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>) => Promise<Cxt>;
 
     private requireSth(filePath: string): any {
         const depFilePath = join(this.path, filePath);
@@ -110,7 +109,15 @@ export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends Backe
         return sthOut;
     }
 
-    constructor(path: string, contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>, header?: IncomingHttpHeaders, clusterInfo?: ClusterInfo) => Promise<Cxt>, ns?: Namespace) {
+    private async makeContext(cxtStr?: string, headers?: IncomingHttpHeaders) {
+        const context = await this.contextBuilder(cxtStr)(this.dbStore);
+        context.clusterInfo = getClusterInfo();
+        context.headers = headers;
+        
+        return context;
+    }
+
+    constructor(path: string, contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>) => Promise<Cxt>, ns?: Namespace) {
         super(path);
         const dbConfig: MySQLConfiguration = require(join(path, '/configuration/mysql.json'));
         const { storageSchema } = require(`${path}/lib/oak-app-domain/Storage`);
@@ -120,8 +127,8 @@ export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends Backe
         this.dbStore = new DbStore<ED, Cxt>(storageSchema, contextBuilder, dbConfig, authDeduceRelationMap, selectFreeEntities, updateFreeDict);
         if (ns) {
             this.dataSubscriber = new DataSubscriber(ns, (scene) => this.contextBuilder(scene)(this.dbStore));
-            this.contextBuilder = (scene) => async (store, header, clusterInfo) => {
-                const context = await contextBuilder(scene)(store, header, clusterInfo);
+            this.contextBuilder = (scene) => async (store) => {
+                const context = await contextBuilder(scene)(store);
 
                 // 注入在提交前向dataSubscribe
                 const originCommit = context.commit;
@@ -150,96 +157,34 @@ export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends Backe
         }
     }
 
+    protected registerTrigger(trigger: Trigger<ED, keyof ED, Cxt>) {
+        this.dbStore.registerTrigger(trigger);
+    }
+
     initTriggers() {
         const triggers = this.requireSth('lib/triggers/index');
         const checkers = this.requireSth('lib/checkers/index');
         const { ActionDefDict } = require(`${this.path}/lib/oak-app-domain/ActionDefDict`);
 
         const { triggers: adTriggers, checkers: adCheckers } = makeIntrinsicCTWs(this.dbStore.getSchema(), ActionDefDict);
+
         triggers.forEach(
-            (trigger: Trigger<ED, keyof ED, Cxt>) => this.dbStore.registerTrigger(trigger)
+            (trigger: Trigger<ED, keyof ED, Cxt>) => this.registerTrigger(trigger)
         );
+
         adTriggers.forEach(
-            (trigger) => this.dbStore.registerTrigger(trigger)
+            (trigger) => this.registerTrigger(trigger)
         );
+
         checkers.forEach(
             (checker: Checker<ED, keyof ED, Cxt>) => this.dbStore.registerChecker(checker)
         );
+
         adCheckers.forEach(
             (checker) => this.dbStore.registerChecker(checker)
         );
     }
 
-    startWatchers() {
-        const watchers = this.requireSth('lib/watchers/index');
-        const { ActionDefDict } = require(`${this.path}/lib/oak-app-domain/ActionDefDict`);
-
-        const { watchers: adWatchers } = makeIntrinsicCTWs(this.dbStore.getSchema(), ActionDefDict);
-        const totalWatchers = (<Watcher<ED, keyof ED, Cxt>[]>watchers).concat(adWatchers);
-
-        let count = 0;
-        const doWatchers = async () => {
-            count++;
-            const start = Date.now();
-            const context = await this.contextBuilder()(this.dbStore, undefined, getClusterInfo());
-            for (const w of totalWatchers) {
-                await context.begin();
-                try {
-                    if (w.hasOwnProperty('actionData')) {
-                        const { entity, action, filter, actionData } = <BBWatcher<ED, keyof ED>>w;
-                        const filter2 = typeof filter === 'function' ? await filter() : filter;
-                        const data = typeof actionData === 'function' ? await (actionData as any)() : actionData;        // 这里有个奇怪的编译错误，不理解 by Xc
-                        const result = await this.dbStore.operate(entity, {
-                            id: await generateNewIdAsync(),
-                            action,
-                            data,
-                            filter: filter2
-                        }, context, {
-                            dontCollect: true,
-                        });
-
-                        console.log(`执行了watcher【${w.name}】，结果是：`, result);
-                    }
-                    else {
-                        const { entity, projection, fn, filter } = <WBWatcher<ED, keyof ED, Cxt>>w;
-                        const filter2 = typeof filter === 'function' ? await filter() : filter;
-                        const projection2 = typeof projection === 'function' ? await (projection as Function)() : projection;
-                        const rows = await this.dbStore.select(entity, {
-                            data: projection2 as any,
-                            filter: filter2,
-                        }, context, {
-                            dontCollect: true,
-                            blockTrigger: true,
-                        });
-
-                        if (rows.length > 0) {
-                            const result = await fn(context, rows);
-                            console.log(`执行了watcher【${w.name}】，结果是：`, result);
-                        }
-                    }
-                    await context.commit();
-                }
-                catch (err) {
-                    await context.rollback();
-                    console.error(`执行了watcher【${w.name}】，发生错误：`, err);
-                }
-            }
-            const duration = Date.now() - start;
-            console.log(`第${count}次执行watchers，共执行${watchers.length}个，耗时${duration}毫秒`);
-            
-            const now = Date.now();
-            try {
-                await this.dbStore.checkpoint(process.env.NODE_ENV === 'development' ? now - 30 * 1000 : now - 120 * 1000);
-            }
-            catch (err) {
-                console.error(`执行了checkpoint，发生错误：`, err);
-            }            
-
-            setTimeout(() => doWatchers(), 120000);
-        };
-        doWatchers();
-    }
-
     async mount(initialize?: true) {
         const { path } = this;
         if (!initialize) {
@@ -255,12 +200,13 @@ export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends Backe
         this.dbStore.disconnect();
     }
 
-    async execAspect(name: string, header?: IncomingHttpHeaders, contextString?: string, params?: any): Promise<{
+    async execAspect(name: string, headers?: IncomingHttpHeaders, contextString?: string, params?: any): Promise<{
         opRecords: OpRecord<ED>[];
         result: any;
         message?: string;
     }> {
-        const context = await this.contextBuilder(contextString)(this.dbStore, header, getClusterInfo());
+        const context = await this.makeContext(contextString, headers);
+
         const fn = this.aspectDict[name];
         if (!fn) {
             throw new Error(`不存在的接口名称: ${name}`);
@@ -340,7 +286,8 @@ export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends Backe
             }
             endPointRouters.push(
                 [name, method, url, async (params, headers, req, body) => {
-                    const context = await this.contextBuilder()(this.dbStore, headers, getClusterInfo());
+                    const context = await this.makeContext(undefined, headers);
+
                     await context.begin();
                     try {
                         const result = await fn(context, params, headers, req, body);
@@ -369,18 +316,106 @@ export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends Backe
         return endPointRouters;
     }
 
+    protected operateInWatcher<T extends keyof ED>(entity: T, operation: ED[T]['Update'], context: Cxt) {
+        return  this.dbStore.operate(entity, operation, context, {
+            dontCollect: true,
+        });
+    }
+
+    protected  selectInWatcher<T extends keyof ED>(entity: T, selection: ED[T]['Selection'], context: Cxt) {
+        return this.dbStore.select(entity, selection, context, {
+            dontCollect: true,
+            blockTrigger: true,
+        })
+    }
+
+    protected async execWatcher(watcher: Watcher<ED, keyof ED, Cxt>) {
+        const context = await this.makeContext();
+        await context.begin();
+        try {
+            if (watcher.hasOwnProperty('actionData')) {
+                const { entity, action, filter, actionData } = <BBWatcher<ED, keyof ED>>watcher;
+                const filter2 = typeof filter === 'function' ? await filter() : filter;
+                const data = typeof actionData === 'function' ? await (actionData)() : actionData;
+                const result = await this.operateInWatcher(entity, {
+                    id: await generateNewIdAsync(),
+                    action,
+                    data,
+                    filter: filter2
+                }, context);
+
+                console.log(`执行了watcher【${watcher.name}】，结果是：`, result);
+            }
+            else {
+                const { entity, projection, fn, filter } = <WBWatcher<ED, keyof ED, Cxt>>watcher;
+                const filter2 = typeof filter === 'function' ? await filter() : filter;
+                const projection2 = typeof projection === 'function' ? await projection () : projection;
+                const rows = await this.selectInWatcher(entity, {
+                    data: projection2,
+                    filter: filter2,
+                }, context);
+
+                if (rows.length > 0) {
+                    const result = await fn(context, rows);
+                    console.log(`执行了watcher【${watcher.name}】，结果是：`, result);
+                }
+            }
+            await context.commit();
+        }
+        catch (err) {
+            await context.rollback();
+            console.error(`执行了watcher【${watcher.name}】，发生错误：`, err);
+        }
+    }
+
+    startWatchers() {
+        const watchers = this.requireSth('lib/watchers/index');
+        const { ActionDefDict } = require(`${this.path}/lib/oak-app-domain/ActionDefDict`);
+
+        const { watchers: adWatchers } = makeIntrinsicCTWs(this.dbStore.getSchema(), ActionDefDict);
+        const totalWatchers = (<Watcher<ED, keyof ED, Cxt>[]>watchers).concat(adWatchers);
+
+        let count = 0;
+        const doWatchers = async () => {
+            count++;
+            const start = Date.now();
+            for (const w of totalWatchers) {
+                await this.execWatcher(w);
+            }
+            const duration = Date.now() - start;
+            console.log(`第${count}次执行watchers，共执行${watchers.length}个，耗时${duration}毫秒`);
+            
+            const now = Date.now();
+            try {
+                await this.dbStore.checkpoint(process.env.NODE_ENV === 'development' ? now - 30 * 1000 : now - 120 * 1000);
+            }
+            catch (err) {
+                console.error(`执行了checkpoint，发生错误：`, err);
+            }            
+
+            setTimeout(() => doWatchers(), 120000);
+        };
+        doWatchers();
+    }
+
     startTimers() {
-        const timers = this.requireSth('lib/timers/index');
+        const timers: Timer<ED, keyof ED, Cxt>[] = this.requireSth('lib/timers/index');
         for (const timer of timers) {
-            const { cron, fn, name } = timer;
+            const { cron, name } = timer;
             scheduleJob(name, cron, async (date) => {
                 const start = Date.now();
-                const context = await this.contextBuilder()(this.dbStore, undefined, getClusterInfo());
+                const context = await this.makeContext();
                 await context.begin();
                 console.log(`定时器【${name}】开始执行，时间是【${date.toLocaleTimeString()}】`);
                 try {
-                    const result = await fn(context);
-                    console.log(`定时器【${name}】执行完成，耗时${Date.now() - start}毫秒，结果是【${result}】`);
+                    if (timer.hasOwnProperty('entity')) {
+                        await this.execWatcher(timer as Watcher<ED, keyof ED, Cxt>);
+                    }
+                    else {
+                        const { timer: timerFn } = timer as FreeTimer<ED, Cxt>;
+                        const result = await timerFn(context);
+                        console.log(`定时器【${name}】执行完成，耗时${Date.now() - start}毫秒，结果是【${result}】`);
+                    }
                     await context.commit();
                 }
                 catch (err) {
@@ -392,26 +427,33 @@ export class AppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends Backe
     }
 
     async execStartRoutines() {
-        const routines = this.requireSth('lib/routines/start');
+        const routines: Routine<ED, keyof ED, Cxt>[] = this.requireSth('lib/routines/start');
         for (const routine of routines) {
-            const { name, fn } = routine;
-            const context = await this.contextBuilder()(this.dbStore, undefined, getClusterInfo());
-            const start = Date.now();
-            await context.begin();
-            try {
-                const result = await fn(context);
-                console.log(`例程【${name}】执行完成，耗时${Date.now() - start}毫秒，结果是【${result}】`);
-                await context.commit();
+            if (routine.hasOwnProperty('entity')) {
+                this.execWatcher(routine as Watcher<ED, keyof ED, Cxt>);
             }
-            catch (err) {
-                console.warn(`例程【${name}】执行失败，耗时${Date.now() - start}毫秒，错误是`, err);
-                await context.rollback();
+            else {
+                const { name, routine: routineFn } = routine as FreeRoutine<ED, Cxt>;
+                const context = await this.makeContext();
+    
+                const start = Date.now();
+                await context.begin();
+                try {
+                    const result = await routineFn(context);
+                    console.log(`例程【${name}】执行完成，耗时${Date.now() - start}毫秒，结果是【${result}】`);
+                    await context.commit();
+                }
+                catch (err) {
+                    console.warn(`例程【${name}】执行失败，耗时${Date.now() - start}毫秒，错误是`, err);
+                    await context.rollback();
+                }
             }
         }
     }
 
     async execRoutine(routine: (context: Cxt) => Promise<void>) {
-        const context = await this.contextBuilder()(this.dbStore, undefined, getClusterInfo());
+        const context = await this.makeContext();
+        
         await routine(context);
     }
 }
\ No newline at end of file
diff --git a/src/ClusterAppLoader.ts b/src/ClusterAppLoader.ts
new file mode 100644
index 0000000..78e5760
--- /dev/null
+++ b/src/ClusterAppLoader.ts
@@ -0,0 +1,64 @@
+import { combineFilters } from 'oak-domain/lib/store/filter';
+import { EntityDict as BaseEntityDict } from 'oak-domain/lib/base-app-domain';
+import { EntityDict, OperationResult, VolatileTrigger, Trigger } from 'oak-domain/lib/types';
+import { BackendRuntimeContext } from 'oak-frontend-base';
+import { getClusterInfo } from './cluster/env';
+
+import { AppLoader } from './AppLoader';
+import assert from 'assert';
+import { DbStore } from './DbStore';
+import { Namespace } from 'socket.io';
+
+export class ClusterAppLoader<ED extends EntityDict & BaseEntityDict, Cxt extends BackendRuntimeContext<ED>> extends AppLoader<ED, Cxt> {
+    constructor(path: string, contextBuilder: (scene?: string) => (store: DbStore<ED, Cxt>) => Promise<Cxt>, ns?: Namespace) {
+        super(path, contextBuilder, ns);
+        this.dbStore.setOnVolatileTrigger(
+            async (entity, trigger, ids, cxtStr, option) => {
+                if (trigger.cs) {
+                    // 如果是cluster sensative的触发器，需要发送到相应的instance上被处理
+                }
+                else {
+                    const context = await this.contextBuilder(cxtStr)(this.dbStore);
+                    await context.begin();
+                    try {
+                        await this.dbStore.execVolatileTrigger(entity, trigger.name, ids, context, option);
+                        await context.commit();
+                    }
+                    catch (err) {
+                        await context.rollback();
+                        console.error('execVolatileTrigger异常', entity, trigger.name, ids, option, err);
+                    }
+                }
+            }
+        )
+    }
+    protected operateInWatcher<T extends keyof ED>(entity: T, operation: ED[T]['Update'], context: Cxt): Promise<OperationResult<ED>> {
+        const { instanceCount, instanceId } = getClusterInfo()!;
+        assert (instanceCount && typeof instanceId === 'number');
+        const { filter } = operation;
+        const filter2 = combineFilters<ED, T>(entity, this.dbStore.getSchema(), [filter, {
+            $$seq$$: {
+                $mod: [instanceCount, instanceId]
+            }
+        }]);
+        return super.operateInWatcher(entity, {
+            ...operation,
+            filter: filter2,
+        }, context);
+    }
+
+    protected selectInWatcher<T extends keyof ED>(entity: T, selection: ED[T]['Selection'], context: Cxt): Promise<Partial<ED[T]['Schema']>[]> {        
+        const { instanceCount, instanceId } = getClusterInfo()!;
+        assert (instanceCount && typeof instanceId === 'number');
+        const { filter } = selection;
+        const filter2 = combineFilters<ED, T>(entity, this.dbStore.getSchema(), [filter, {
+            $$seq$$: {
+                $mod: [instanceCount, instanceId]
+            }
+        }]);
+        return super.selectInWatcher(entity, {
+            ...selection,
+            filter: filter2,
+        }, context);
+    }
+}
\ No newline at end of file
diff --git a/src/DbStore.ts b/src/DbStore.ts
index 85f8039..428020e 100644
--- a/src/DbStore.ts
+++ b/src/DbStore.ts
@@ -1,5 +1,5 @@
 import { MysqlStore, MySqlSelectOption, MysqlOperateOption } from 'oak-db';
-import { EntityDict, StorageSchema, Trigger, Checker, SelectOption, SelectFreeEntities, UpdateFreeDict, AuthDeduceRelationMap } from 'oak-domain/lib/types';
+import { EntityDict, StorageSchema, Trigger, Checker, SelectOption, SelectFreeEntities, UpdateFreeDict, AuthDeduceRelationMap, VolatileTrigger, OperateOption } from 'oak-domain/lib/types';
 import { EntityDict as BaseEntityDict } from 'oak-domain/lib/base-app-domain';
 import { TriggerExecutor } from 'oak-domain/lib/store/TriggerExecutor';
 import { MySQLConfiguration, } from 'oak-db/lib/MySQL/types/Configuration';
@@ -18,9 +18,10 @@ export class DbStore<ED extends EntityDict & BaseEntityDict, Cxt extends Backend
         mysqlConfiguration: MySQLConfiguration,
         authDeduceRelationMap: AuthDeduceRelationMap<ED>,
         selectFreeEntities: SelectFreeEntities<ED> = [],
-        updateFreeDict: UpdateFreeDict<ED> = {}) {
+        updateFreeDict: UpdateFreeDict<ED> = {},
+        onVolatileTrigger?: <T extends keyof ED>(entity: T, trigger: VolatileTrigger<ED, T, Cxt>, ids: string[], cxtStr: string, option: OperateOption) => Promise<void>) {
         super(storageSchema, mysqlConfiguration);
-        this.executor = new TriggerExecutor((scene) => contextBuilder(scene)(this));
+        this.executor = new TriggerExecutor((scene) => contextBuilder(scene)(this), undefined, onVolatileTrigger);
         this.relationAuth = new RelationAuth(storageSchema, authDeduceRelationMap, selectFreeEntities, updateFreeDict);
     }
 
@@ -141,6 +142,27 @@ export class DbStore<ED extends EntityDict & BaseEntityDict, Cxt extends Backend
         this.executor.registerChecker(checker);
     }
 
+    setOnVolatileTrigger(
+        onVolatileTrigger: <T extends keyof ED>(
+            entity: T,
+            trigger: VolatileTrigger<ED, T, Cxt>, 
+            ids: string[], 
+            cxtStr: string,
+            option: OperateOption) => Promise<void>
+    ) {
+        this.executor.setOnVolatileTrigger(onVolatileTrigger);
+    }
+
+    async execVolatileTrigger<T extends keyof ED>(
+        entity: T,
+        name: string,
+        ids: string[],
+        context: Cxt,
+        option: OperateOption
+    ) {
+        return this.executor.execVolatileTrigger(entity, name, ids, context, option);
+    }
+
     checkpoint(ts: number) {
         return this.executor.checkpoint(ts);
     }
diff --git a/src/index.ts b/src/index.ts
index e9b40f2..8cc99a7 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,2 +1,3 @@
 export { AppLoader } from './AppLoader';
+export { ClusterAppLoader } from './ClusterAppLoader';
 export * from './cluster/env';
\ No newline at end of file