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Posted to dev@brpc.apache.org by GitBox <gi...@apache.org> on 2019/06/21 13:46:40 UTC
[GitHub] [incubator-brpc] gtarcoder commented on issue #820: LALB 策略可能落入死循环
gtarcoder commented on issue #820: LALB 策略可能落入死循环
URL: https://github.com/apache/incubator-brpc/issues/820#issuecomment-504431688
发现程序的运行路线是这样的：
1. 下游服务端频繁超时
2. 客户端每次RPC 后会 FeedBack ( src/brpc/policy/locality_aware_load_balancer.cpp/Feedback) 更新节点的weight
3. 节点不断被降权
4. 最终节点的 _base_weight 变成了0 ，从而节点被disable
5. 在 SelectServer 中，始终走到如下分支逻辑，
在 AddInflight 中，会直接返回 {false, 0}. （由于节点被disable）
所以，每次都无法select 出来节点。
6 . 无法select节点，就无法IssueRPC，节点的weight 就无法通过 Feedback 来进行更新, 节点就一直无法被选择，从而一直报 [E112]Fail to select server from list:// （即使下游服务已经恢复）
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