[GitHub] [dubbo] YsoulM edited a comment on pull request #8755: [3.0] close client immediately when destroy unused invoker

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

YsoulM edited a comment on pull request #8755:
URL: https://github.com/apache/dubbo/pull/8755#issuecomment-969902129


   这个修复应该存在一个不太严重的问题，没有考虑到2.7.*升级到3.*的情况。
   出现问题的大体情况如下：
   如果consumer是2.7.4，provider先升级到3.0.3+，在provider发布的时候，consumer的健康检查还会异常。发布完成之后就没了。
   
   即使consumer也升级到了3.0.3+，provider发布期间，consumer也会出现异常，但是不是100%复现，日常日志如下：
   ```
   [DUBBO] Fail to connect to HeaderExchangeClient [channel=org.apache.dubbo.remoting.transport.netty4.NettyClient [0.0.0.0/0.0.0.0:52452 -> null]], dubbo version: 3.0.3, current host: 10.104.64.165
   org.apache.dubbo.remoting.RemotingException: client(url: dubbo://10.104.67.23:20880/cn.*.api.remoteservice.RemoteGeoService?anyhost=true&application=geo-server&check=false&cluster=failfast&codec=dubbo&deprecated=false&dubbo=2.0.2&dynamic=true&generic=false&heartbeat=60000&interface=cn.*.api.remoteservice.RemoteGeoService&isPerfTestSupportted=true&metadata-type=remote&methods=findGeoInfoByPoint,findGeoInfoByGeoHash&release=3.0.3&retries=0&serverApplicationName=geo-server&service-name-mapping=true&side=provider&threadpool=cached&threads=500&timeout=3000) failed to connect to server null client-side timeout 3000ms (elapsed: 3002ms) from netty client 10.104.64.165 using dubbo version 3.0.3
     at org.apache.dubbo.remoting.transport.netty4.NettyClient.doConnect(NettyClient.java:175)
     at org.apache.dubbo.remoting.transport.AbstractClient.connect(AbstractClient.java:202)
     at org.apache.dubbo.remoting.transport.AbstractClient.reconnect(AbstractClient.java:258)
     at org.apache.dubbo.remoting.exchange.support.header.HeaderExchangeClient.reconnect(HeaderExchangeClient.java:166)
     at org.apache.dubbo.remoting.exchange.support.header.ReconnectTimerTask.doTask(ReconnectTimerTask.java:49)
     at org.apache.dubbo.remoting.exchange.support.header.AbstractTimerTask.run(AbstractTimerTask.java:87)
     at org.apache.dubbo.common.timer.HashedWheelTimer$HashedWheelTimeout.expire(HashedWheelTimer.java:648)
     at org.apache.dubbo.common.timer.HashedWheelTimer$HashedWheelBucket.expireTimeouts(HashedWheelTimer.java:727)
     at org.apache.dubbo.common.timer.HashedWheelTimer$Worker.run(HashedWheelTimer.java:449)
     at java.lang.Thread.run(Thread.java:748)
   ```


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