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Posted to notifications@apisix.apache.org by GitBox <gi...@apache.org> on 2021/02/07 06:44:37 UTC

[GitHub] [apisix] diaosj opened a new issue #3546: request help: when weight set to zero, the node still causes a 5xx error

diaosj opened a new issue #3546:
URL: https://github.com/apache/apisix/issues/3546


   ### Issue description
   Set two nodes to an upstream. Suppose they are `NodeA` and `NodeB`.
   Upstream JSON is like this:
   ```
   {"header":{"revision":"10298","cluster_id":"17817882145681418091","raft_term":"2","member_id":"12344213989818773070"},"count":"1","node":{"modifiedIndex":8878,"value":{"pass_host":"pass","nodes":{"NodeA":100,"NodeB":0},"desc":"","type":"roundrobin","create_time":1611630417,"name":"aplusb-demo-online-service","update_time":1611648368,"id":"aplusb-demo-online-service","hash_on":"vars","enable_websocket":false},"createdIndex":8875,"key":"\/apisix\/upstreams\/aplusb-demo-online-service"},"action":"get"}
   ```
   Notice that the weight of `NodeA` is set to 100 and the weight of `NodeB` is set to 0.
   
   When `NodeB` is destroyed, I found that the API call fails. Error message in `error.log` says:
   ```
   parse_domain(): failed to parse domain: <NodeB>, error: server returned error code: 3: name error...
   ```
   
   Then I weed out the offline `NodeB`, the API call succeeds.
   
   I'm confused. The weight of `NodeB` is set to 0, why this node still causes a 5xx error? Maybe we need a document to explain this to other users.
   
   ### Environment
   
   * apisix version (cmd: `apisix version`): 2.1
   * OS (cmd: `uname -a`): Linux
   * OpenResty / Nginx version (cmd: `nginx -V` or `openresty -V`): openresty/1.19.3.1
   * etcd version, if have (cmd: run `curl http://127.0.0.1:9090/v1/server_info` to get the info from server-info API):
   * apisix-dashboard version, if have:
   


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[GitHub] [apisix] diaosj commented on issue #3546: request help: when weight set to zero, the node still causes a 5xx error

Posted by GitBox <gi...@apache.org>.

diaosj commented on issue #3546:
URL: https://github.com/apache/apisix/issues/3546#issuecomment-774622520


   But I still wonder why. Does APISIX loop all the nodes before routing?


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[GitHub] [apisix] diaosj commented on issue #3546: request help: when weight set to zero, the node still causes a 5xx error

Posted by GitBox <gi...@apache.org>.

diaosj commented on issue #3546:
URL: https://github.com/apache/apisix/issues/3546#issuecomment-774620414


   > You can try the latest version, not sure if this problem has been fixed.
   
   ok. thx!


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[GitHub] [apisix] spacewander closed issue #3546: request help: when weight set to zero, the node still causes a 5xx error

Posted by GitBox <gi...@apache.org>.

spacewander closed issue #3546:
URL: https://github.com/apache/apisix/issues/3546


   


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[GitHub] [apisix] Firstsawyou commented on issue #3546: request help: when weight set to zero, the node still causes a 5xx error

Posted by GitBox <gi...@apache.org>.

Firstsawyou commented on issue #3546:
URL: https://github.com/apache/apisix/issues/3546#issuecomment-774627204


   > But I still wonder why. Does APISIX loop all the nodes before routing?
   
   APISIX has a retry mechanism for all upstream nodes. You can learn more about it here： https://github.com/apache/apisix/blob/master/doc/admin-api.md#upstream


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[GitHub] [apisix] Firstsawyou commented on issue #3546: request help: when weight set to zero, the node still causes a 5xx error

Posted by GitBox <gi...@apache.org>.

Firstsawyou commented on issue #3546:
URL: https://github.com/apache/apisix/issues/3546#issuecomment-774618347


   You can try the latest version, not sure if this problem has been fixed.


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