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Posted to commits@servicecomb.apache.org by GitBox <gi...@apache.org> on 2021/06/22 14:00:15 UTC
[GitHub] [servicecomb-java-chassis] kissLife opened a new issue #2429: 有2个provider，当某个provider出现网络时延时，2个provider的吞吐量都下降了，是什么机制导致的吗？
kissLife opened a new issue #2429:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2429
有2个provider，然后在某1个provider（DM）上模拟网络时延（另1个provider保持正常），当consumer（AS）调用时，发现2个provider的吞吐量都下来了，从之前的280TPS降到了60TPS，测试流量图如下：
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[GitHub] [servicecomb-java-chassis] kissLife edited a comment on issue #2429: 有2个provider，当某个provider出现网络时延时，2个provider的吞吐量都下降了，是什么机制导致的吗？
Posted by GitBox <gi...@apache.org>.
kissLife edited a comment on issue #2429:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2429#issuecomment-866484720
@liubao68 @wujimin 感谢~
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[GitHub] [servicecomb-java-chassis] kissLife commented on issue #2429: 有2个provider，当某个provider出现网络时延时，2个provider的吞吐量都下降了，是什么机制导致的吗？
Posted by GitBox <gi...@apache.org>.
kissLife commented on issue #2429:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2429#issuecomment-866484720
@liubao68 @wujimin
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[GitHub] [servicecomb-java-chassis] liubao68 commented on issue #2429: 有2个provider，当某个provider出现网络时延时，2个provider的吞吐量都下降了，是什么机制导致的吗？
Posted by GitBox <gi...@apache.org>.
liubao68 commented on issue #2429:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2429#issuecomment-866473427
受consuemr共享线程池的影响，一个请求慢了， 其他快的请求也会等待线程池被释放。
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[GitHub] [servicecomb-java-chassis] wujimin commented on issue #2429: 有2个provider，当某个provider出现网络时延时，2个provider的吞吐量都下降了，是什么机制导致的吗？
Posted by GitBox <gi...@apache.org>.
wujimin commented on issue #2429:
URL: https://github.com/apache/servicecomb-java-chassis/issues/2429#issuecomment-866480720
```
jmeter -> consumer -> provider 1/2
```
如果是这个流程
consumer首先是一个provider，默认使用一个共享线程池处理所有请求
收到请求后，再 **同步** 调用后面的provider，此时会阻塞当前线程等待provider应答，这个“当前线程”，就是共享线程池里的线程
所以，某个provider慢，会影响整体速度
所有的同步调用，都会面临这种问题，要彻底解决，业务需要从同步改为异步方式调用后面的provider
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