[GitHub] [apisix] tokers commented on issue #4461: request help: How much lua_max_pending_timers should be set to

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

tokers commented on issue #4461:
URL: https://github.com/apache/apisix/issues/4461#issuecomment-876350778


   > I only caught the exception refer this #3169. Because without it, my user will get a 500 error when the timer is insufficient.
   > 
   > I not use v2.7. I reproduced this problem in v2.3. In addition, I found that the code of balancer.lua has been rewritten in v2.3. In the error log, I only saw one line of error message:
   > 
   > ```
   > 2021/07/08 16:46:17 [error] 31019#31019: *166383 [lua] upstream.lua:88: fetch_healthchecker(): fail to create healthcheck instance: failed to create 'healthy' timer: too many pending timers, client: 127.0.0.1, server: , request: "POST /rpc/account HTTP/1.1", host: "test.xxx.com", referrer: "https://test.xxx.com/circle/"
   > ```
   > 
   > The way I reproduce the problem:
   > 
   > 1. Reduce the number of timers. like this
   > 
   > ```
   >     lua_max_pending_timers 15;
   >     lua_max_running_timers 12;
   > ```
   > 
   > 2.Open a page with a large number of requests, and then constantly force a refresh
   
   Seems that `15` is too small for APISIX as the max pending number of timers.


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