Version: 1.3.0

微服务租户隔离架构设计

1. 总述#

需求背景#

Linkis在Gateway进行服务转发时是基于ribbon进行负载均衡的，但是有些情况下存在一些重要业务的任务希望做到服务级别的隔离，如果基于ribbon进行服务在均衡就会存在问题。比如租户A希望他的任务都路由到特定的Linkis-CG-Entrance服务，这样当其他的实例出现异常时可以不会影响到A服务的Entrance。另外支持服务的租户及隔离也可以做到快速隔离某个异常服务，支持灰度升级等场景。

目标#

支持通过解析请求的标签按照路由标签对服务进行转发
支持服务的标签注册和修改

2. 总体设计#

此次特性新增主要修改点位linkis-mg-gateway和instance-label两个模块，设计到新增Gateway的转发逻辑，以及instance-label支持服务和标签的注册。

2.1 技术架构#

整体技术架构主要修改点位RestFul请求需要带上路由标签等标签参数信息，然后在Gateway进行转发时会解析对应的标签完成接口的路由转发。整体如下图所示 arc

几点说明：

如果存在多个对应的服务打上了同一个roteLabel则随机转发
如果对应的routeLabel没有对应的服务，则接口直接失败
如果接口没有routeLabel则基于原有的转发逻辑，不会路由到打上了特定标签的服务

2.2 业务架构#

此次的特性主要是为了完成Restful租户隔离转发功能。功能点设计的模块如下：

组件名	一级模块	二级模块	功能点
Linkis	MG	Gateway	解析restful请求参数中的路由标签，完成接口按照路由标签的转发功能
Linkis	PS	InstanceLabel	InstanceLabel服务，完成服务和标签的关联

3. 模块设计#

核心执行流程#

[输入端] 输入端为请求Gatway的restful请求，且是参数中待用roure label的请求才会进行处理
[处理流程] Gateway会判断请求是否带有对应的RouteLabel，如果存在则基于RouteLabel来进行转发。调用时序图如下：

Time

4. 数据结构：#

DROP TABLE IF EXISTS `linkis_ps_instance_label`;CREATE TABLE `linkis_ps_instance_label` (  `id` int(20) NOT NULL AUTO_INCREMENT,  `label_key` varchar(32) COLLATE utf8_bin NOT NULL COMMENT 'string key',  `label_value` varchar(255) COLLATE utf8_bin NOT NULL COMMENT 'string value',  `label_feature` varchar(16) COLLATE utf8_bin NOT NULL COMMENT 'store the feature of label, but it may be redundant',  `label_value_size` int(20) NOT NULL COMMENT 'size of key -> value map',  `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'update unix timestamp',  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT 'update unix timestamp',  PRIMARY KEY (`id`),  UNIQUE KEY `label_key_value` (`label_key`,`label_value`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
DROP TABLE IF EXISTS `linkis_ps_instance_info`;CREATE TABLE `linkis_ps_instance_info` (  `id` int(11) NOT NULL AUTO_INCREMENT,  `instance` varchar(128) COLLATE utf8_bin DEFAULT NULL COMMENT 'structure like ${host|machine}:${port}',  `name` varchar(128) COLLATE utf8_bin DEFAULT NULL COMMENT 'equal application name in registry',  `update_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT 'update unix timestamp',  `create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT 'create unix timestamp',  PRIMARY KEY (`id`),  UNIQUE KEY `instance` (`instance`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
DROP TABLE IF EXISTS `linkis_ps_instance_label_relation`;CREATE TABLE `linkis_ps_instance_label_relation` (  `id` int(20) NOT NULL AUTO_INCREMENT,  `label_id` int(20) DEFAULT NULL COMMENT 'id reference linkis_ps_instance_label -> id',  `service_instance` varchar(128) NOT NULL COLLATE utf8_bin COMMENT 'structure like ${host|machine}:${port}',  `update_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT 'update unix timestamp',  `create_time` datetime DEFAULT CURRENT_TIMESTAMP COMMENT 'create unix timestamp',  PRIMARY KEY (`id`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

5. 如何使用：#

add route label for entrance#

echo "spring.eureka.instance.metadata-map.route=et1" >> $LINKIS_CONF_DIR/linkis-cg-entrance.properties sh  $LINKIS_HOME/sbin/linkis-damemon.sh restart cg-entrance

Time

Use route label#

submit task:

url:/api/v1/entrance/submit{    "executionContent": {"code": "echo 1", "runType":  "shell"},    "params": {"variable": {}, "configuration": {}},    "source":  {"scriptPath": "ip"},    "labels": {        "engineType": "shell-1",        "userCreator": "peacewong-IDE",        "route": "et1"    }}

will be routed to a fixed service：

{    "method": "/api/entrance/submit",    "status": 0,    "message": "OK",    "data": {        "taskID": 45158,        "execID": "exec_id018030linkis-cg-entrancelocalhost:9205IDE_peacewong_shell_0"    }}

or linkis-cli:

sh bin/linkis-cli -submitUser  hadoop  -engineType shell-1 -codeType shell  -code "whoami" -labelMap route=et1 --gatewayUrl http://127.0.0.1:9101

Use non-existing label#

submit task:

url:/api/v1/entrance/submit{    "executionContent": {"code": "echo 1", "runType":  "shell"},    "params": {"variable": {}, "configuration": {}},    "source":  {"scriptPath": "ip"},    "labels": {        "engineType": "shell-1",        "userCreator": "peacewong-IDE",        "route": "et1"    }}

will get the error

{    "method": "/api/rest_j/v1/entrance/submit",    "status": 1,    "message": "GatewayErrorException: errCode: 11011 ,desc: Cannot route to the corresponding service, URL: /api/rest_j/v1/entrance/submit RouteLabel: [{\"stringValue\":\"et2\",\"labelKey\":\"route\",\"feature\":null,\"modifiable\":true,\"featureKey\":\"feature\",\"empty\":false}] ,ip: localhost ,port: 9101 ,serviceKind: linkis-mg-gateway",    "data": {        "data": "{\r\n    \"executionContent\": {\"code\": \"echo 1\", \"runType\":  \"shell\"},\r\n    \"params\": {\"variable\": {}, \"configuration\": {}},\r\n    \"source\":  {\"scriptPath\": \"ip\"},\r\n    \"labels\": {\r\n        \"engineType\": \"shell-1\",\r\n        \"userCreator\": \"peacewong-IDE\",\r\n        \"route\": \"et2\"\r\n    }\r\n}"    }}

without label#

submit task:

url:/api/v1/entrance/submit{    "executionContent": {"code": "echo 1", "runType":  "shell"},    "params": {"variable": {}, "configuration": {}},    "source":  {"scriptPath": "ip"},    "labels": {        "engineType": "shell-1",        "userCreator": "peacewong-IDE"    }}


will route to untagged entranceservices{    "method": "/api/entrance/submit",    "status": 0,    "message": "OK",    "data": {        "taskID": 45159,        "execID": "exec_id018018linkis-cg-entrancelocalhost2:9205IDE_peacewong_shell_0"    }}

6. 非功能性设计：#

6.1 安全#

不涉及安全问题，restful需要登录认证

6.2 性能#

对Gateway转发性能影响较小，有缓存相应的label和instance的数据

6.3 容量#

不涉及

6.4 高可用#

不涉及