morningman opened a new pull request, #32869:
URL: https://github.com/apache/doris/pull/32869
## Proposed changes
In previously, when enbling FQDN, Doris will call dns resolver to get IP
from hostname
each time when 1) FE gets BE's grpc client. 2) BE gets other BE's brpc
client.
So when in high concurrency case, the dns resolver be overloaded and failed
to resolve hostname.
This PR mainly changes:
1. Add DNSCache for both FE and BE.
The DNSCache will run on every FE and BE node. It has a cache, key is
hostname and value is IP.
Caller can get IP by hostname from this cache, and if hostname does not
exist, it will try to resolve it
and update the cache.
In addition, DNSCache has a daemon thread to refresh the cache every 1
min, in case that the IP may
be changed at anytime.
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[d...@doris.apache.org](mailto:d...@doris.apache.org) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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