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Posted to dev@brpc.apache.org by GitBox <gi...@apache.org> on 2020/03/21 01:56:51 UTC
[GitHub] [incubator-brpc] GOGOYAO opened a new issue #1069: Cannot assign
requested address
GOGOYAO opened a new issue #1069: Cannot assign requested address
URL: https://github.com/apache/incubator-brpc/issues/1069
**Describe the bug (描述bug)**
W0321 09:41:31.386391 44601 /tmp/incubator-brpc/src/brpc/socket.cpp:1134] Fail to connect to 172.17.0.3:44444: Cannot assign requested address
**To Reproduce (复现方法)**
brpc::Channel放在栈空间，也就是说每次请求server的时候，都会构造/析构。当rpc发送一段时间后，就会出这个错误。是因为不断地构造/析构导致的吗
**Expected behavior (期望行为)**
正常请求
**Versions (各种版本)**
OS: centos 7.7
Compiler: gcc 8
brpc: master最新分支
protobuf: 3.11
**Additional context/screenshots (更多上下文/截图)**
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[GitHub] [incubator-brpc] GOGOYAO commented on issue #1069: Cannot assign
requested address
Posted by GitBox <gi...@apache.org>.
GOGOYAO commented on issue #1069: Cannot assign requested address
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-602002043
> 选项`-reuse_addr`没有设置为false吧
对的。都是用的默认的选项。这里reuse_addr和reuse_port推荐是怎么设置呢？
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[GitHub] [incubator-brpc] GOGOYAO commented on issue #1069: Cannot assign
requested address
Posted by GitBox <gi...@apache.org>.
GOGOYAO commented on issue #1069: Cannot assign requested address
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-602141011
> 选项`-reuse_addr`没有设置为false吧
戈神，话说我使用的是单链接，场景也是一个client和一个server，reuse_addr不管设置什么值，也不该出现这个情况吧。我理解都是在复用一个连接。
还是没太懂reuse_addr设为false的用意，求解答下，感谢
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[GitHub] [incubator-brpc] GOGOYAO commented on issue #1069: Cannot assign requested address
Posted by GitBox <gi...@apache.org>.
GOGOYAO commented on issue #1069:
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-618891035
> 回到你这个case，你是在向本机一直发请求吗？ QPS有多少？
是向本地发的。qps没注意，就是起了几个线程while循环一直在发。
你说的有道理，不过我一直理解成 单链接哪怕在channel实例析构后，还会存活一会，以便复用。。话说这样岂不是更好么？复用率更高
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[GitHub] [incubator-brpc] jamesge commented on issue #1069: Cannot assign
requested address
Posted by GitBox <gi...@apache.org>.
jamesge commented on issue #1069: Cannot assign requested address
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-601995013
选项`-reuse_addr`没有设置为false吧
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[GitHub] [incubator-brpc] gydong commented on issue #1069: Cannot assign requested address
Posted by GitBox <gi...@apache.org>.
gydong commented on issue #1069:
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-619467152
实例析构，而它背后的某些资源还存在，这其实有悖于RAII理念的设计。如果是换做连接池模式，你说的是可以的。我觉着就是用应用层面去复用实例就好，仔细想想，这种事情如果放到框架在背后偷偷做，可能你会更反对。
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[GitHub] [incubator-brpc] GOGOYAO commented on issue #1069: Cannot assign requested address
Posted by GitBox <gi...@apache.org>.
GOGOYAO commented on issue #1069:
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-618780615
> 是的
尴尬，文档里面还说的 “Channel可以分配在栈上。” 这句话该咋理解呢？这句话不是连接可以复用？
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[GitHub] [incubator-brpc] gydong commented on issue #1069: Cannot assign requested address
Posted by GitBox <gi...@apache.org>.
gydong commented on issue #1069:
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-618799067
是可以放到栈上。但地址也是一种资源，就像内存一样，更多的要靠应用去选择合适的方式来避免资源耗尽，框架层面主要负责提供丰富的、灵活的接口，解决共性问题、满足共性需求。
回到你这个case，你是在向本机一直发请求吗？ QPS有多少？
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[GitHub] [incubator-brpc] gydong commented on issue #1069: Cannot assign requested address
Posted by GitBox <gi...@apache.org>.
gydong commented on issue #1069:
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-618771882
是的
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[GitHub] [incubator-brpc] chenzhangyi commented on issue #1069: Cannot assign requested address
Posted by GitBox <gi...@apache.org>.
chenzhangyi commented on issue #1069:
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-619495220
可以设置[-defer_close_second](https://github.com/apache/incubator-brpc/blob/2f8fc37d52c2a02ee6f348aaa52c7ded4a4844c3/src/brpc/socket_map.cpp#L43). 这个是用来解决这类问题的
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[GitHub] [incubator-brpc] GOGOYAO commented on issue #1069: Cannot assign requested address
Posted by GitBox <gi...@apache.org>.
GOGOYAO commented on issue #1069:
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-619493775
> 实例析构，而它背后的某些资源还存在，这其实有悖于RAII理念的设计。如果是换做连接池模式，你说的是可以的。我觉着就是用应用层面去复用实例就好，仔细想想，这种事情如果放到框架在背后偷偷做，可能你会更反对。
恩恩。感谢解答
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[GitHub] [incubator-brpc] GOGOYAO commented on issue #1069: Cannot assign requested address
Posted by GitBox <gi...@apache.org>.
GOGOYAO commented on issue #1069:
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-618405069
> 1、尽管是单连接，但实例析构之后，连接不会得到复用，而是会重复建立连接。（这一点用ss命令查看确认一下即可）
实例析构是指得channel实例析构么？
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[GitHub] [incubator-brpc] gydong commented on issue #1069: Cannot assign requested address
Posted by GitBox <gi...@apache.org>.
gydong commented on issue #1069:
URL: https://github.com/apache/incubator-brpc/issues/1069#issuecomment-616898361
1、尽管是单连接，但实例析构之后，连接不会得到复用，而是会重复建立连接。（这一点用ss命令查看确认一下即可）
2、reuse_addr 保持默认的true即可，但这个选项和你遇到的问题关系应该不大，怎么设置都解决不了你遇到的问题。原因是从brpc的实现来看，reuse_addr这个开关只对server端的listen动作管用，对于client端的connect动作是没有任何作用的。
综上，要解决你的问题，应该让channel实例得到复用。
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