Applenice commented on issue #2695:
URL: https://github.com/apache/apisix/issues/2695#issuecomment-726600424
After adding `enable-grpc-gateway: true`, after working for a while, it
starts reporting errors at a high frequency，The `error.log` file has reached
24M in 40 minutes.😳
```
2020/11/13 16:20:18 [error] 8944#8944: *831322 [lua] config_etcd.lua:448:
failed to fetch data from etcd: /usr/local/apisix/apisix/core/etcd.lua:115: bad
argument #1 to 'ipairs' (table expected, got nil)
stack traceback:
[C]: in function 'ipairs'
/usr/local/apisix/apisix/core/etcd.lua:115: in function 'waitdir'
/usr/local/apisix/apisix/core/config_etcd.lua:255: in function
'sync_data'
/usr/local/apisix/apisix/core/config_etcd.lua:424: in function
</usr/local/apisix/apisix/core/config_etcd.lua:414>
[C]: in function 'xpcall'
/usr/local/apisix/apisix/core/config_etcd.lua:414: in function
</usr/local/apisix/apisix/core/config_etcd.lua:405>, etcd key:
/apisix/global_rules, context: ngx.timer
```
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