0.2.0 核心能力补充

路由能力补充

支持路由时 cluster 带权重

  • issue
  • 功能描述
    • 在当前的路由匹配逻辑中，router match 成功，会选中 router 中对应的 cluster，在这个功能中，一个
      router 允许配置多个带有权重的 cluster，在 router 匹配成功的时候，会根据 cluster 的 weight 随机返回某一个cluster

  • 配置示例
    ```json

    1.                         {
    2.                         "weighted_clusters":[
    3.                           {
    4.                             "cluster":{
    5.                               "name":"serverCluster1",
    6.                               "weight":90,
    7.                               "metadata_match":{
    8.                                 "filter_metadata": {
    9.                                   "mosn.lb": {
    10.                                     "version": "v1"
    11.                                   }
    12.                                 }
    13.                               }
    14.                             }
    15.                           },
    16.                           {
    17.                             "cluster":{
    18.                               "name":"serverCluster2",
    19.                               "weight":10,
    20.                               "metadata_match":{
    21.                                 "filter_metadata": {
    22.                                   "mosn.lb": {
    23.                                     "version": "v2"
    24.                                   }
    25.                                 }
    26.                               }
    27.                             }
    28.                           }
    29.                         ]
    30.                         }
  1. ## LB 能力补充
  2. + [issue](https://github.com/alipay/sofa-mosn/issues/91)
  3. ### 支持 host 带权重
  4. + 支持 host 上配置权重，用来做基于 weight 的 LB 算法
  5. + 配置示例
  6. ```json
  7.         {
  8.         "hosts": [
  9.           {
  10.             "address": "11.166.22.163:12200",
  11.             "hostname": "downstream_machine1",
  12.             "weight": 1,
  13.             "metadata": {
  14.               "filter_metadata": {
  15.                 "mosn.lb": {
  16.               "stage": "pre-release",
  17.               "version": "1.1",
  18.               "label": "gray"
  19.             }
  20.               }
  21.             }
  22.           }
  23.         ]
  24.         }

支持 smooth wrr loadbalancer

  • 算法实现: smoothWeightedRRLoadBalancer

  • 算法细节

    1. /*
    2. SW (smoothWeightedRRLoadBalancer) is a struct that contains weighted items and provides methods to select a weighted item.
    3. It is used for the smooth weighted round-robin balancing algorithm. This algorithm is implemented in Nginx:
    4. https://github.com/phusion/nginx/commit/27e94984486058d73157038f7950a0a36ecc6e35.
    5. Algorithm is as follows: on each peer selection we increase current_weight
    6. of each eligible peer by its weight, select peer with greatest current_weight
    7. and reduce its current_weight by total number of weight points distributed
    8. among peers.
    9. In case of { 5, 1, 1 } weights this gives the following sequence of
    10. current_weight's:
    11.    a  b  c
    12.    0  0  0  (initial state)
    14.    5  1  1  (a selected)
    15.   -2  1  1
    17.    3  2  2  (a selected)
    18.   -4  2  2
    20.    1  3  3  (b selected)
    21.    1 -4  3
    23.    6 -3  4  (a selected)
    24.   -1 -3  4
    26.    4 -2  5  (c selected)
    27.    4 -2 -2
    29.    9 -1 -1  (a selected)
    30.    2 -1 -1
    32.    7  0  0  (a selected)
    33.    0  0  0
    34. */

XDS 能力补充

CDS 相关

  • issue
  • 提供 cluster 的添加和更新能力
    • 外部接口：TriggerClusterAddOrUpdate
    • 内部接口: AddOrUpdatePrimaryCluster
  • 提供 cluster 删除能力
    • 外部接口: TriggerClusterDel
    • 内部接口: RemovePrimaryCluster

      LDS 相关

  • issue
  • 提供 Listener 的添加和更新能力
    • 外部接口: AddOrUpdateListener
    • 内部接口: AddOrUpdateListener
  • 提供 Listener 的删除能力
    • 外部接口: DeleteListener
    • 内部接口: StopListener 与 RemoveListeners