ShenFeng312 commented on issue #10620:
URL: https://github.com/apache/apisix/issues/10620#issuecomment-2109221470
When reading data from upstream, APISIX invokes
`ngx_http_multi_upstream_handler`, which then proceeds to
`ngx_http_multi_upstream_process` and ultimately to
`ngx_http_multi_upstream_read_handler`.
In `ngx_http_multi_upstream_read_handler`, a timeout event is added:
```c
n = c->recv(c, b->last, b->end - b->last);
if (n == NGX_AGAIN) {
ngx_add_timer(pc->read, u->conf->read_timeout);
}
```
The purpose of this code is to handle read timeouts. However, I cannot
understand why `ngx_http_multi_upstream_handler` is triggered immediately after
each `ngx_add_timer` call.
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