[GitHub] [incubator-brpc] y1825181 opened a new issue #1572: DynamicPartitionChannel的客户端访问下游多分库服务时，当多分库中的一个分库服务异常后，客户端无法访问下游其他所有分库服务

[GitBox <gi...@apache.org>]

y1825181 opened a new issue #1572:
URL: https://github.com/apache/incubator-brpc/issues/1572


   **Describe the bug (描述bug)**
   配置如下：
   客户端配置
   reload_interval_ms: 3000
   connect_timeout_ms: 15
   timeout_ms: 100
   max_retry: 0
   load_balancer: rr
   fail_limit: 3
   serverlist配置
   192.168.0.1:8001 0/3
   192.168.0.2:8001 1/3
   192.168.0.3:8001 2/3
   **To Reproduce (复现方法)**
   当3分库中的一个服务，例如192.168.0.1:8001服务不可用后，客户端也无法与下游的其他两个分库建立连接
   附，当请求压力较大时，会出现该现象。请求压力小时，无该现象出现；
   当192.168.0.1:8001服务可用后，客户端可与下游所有分库正常通信
   **Expected behavior (期望行为)**
   期望提供该问题定位方向，和修复办法
   **Versions (各种版本)**
   OS: openeuler 20.03
   Compiler: gcc 4.8.5
   brpc: 0.9.7
   protobuf: 3.9.0
   
   **Additional context/screenshots (更多上下文/截图)**
   一些错误信息：
   ![E112]Fail to select channel, Host is down
   incubator-brpc-0.9.7/src/brpc/selective_channel.cpp:53] Checking ParallelChannel[3] chan=0x0x557d9961cf30 FakeSocket{id=130 addr=0.0.0.0:0} (0x557d99603a30)
   incubator-brpc-0.9.7/src/brpc/selective_channel.cpp:60] Revived ParallelChannel[3] chan=0x0x557d9961cf30 FakeSocket{id=130 addr=0.0.0.0:0} (0x557d99603a30) (Connectable)
   并且，偶尔会打印一条这个日志信息（实际设置的fail_limit为3）
   ![E112]1/1 channels failed, fail_limit=1 [C0][E112]Fail to select server from list:// lb=rr


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