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[opt](fqdn) Add DNS Cache for FE and BE (#32869) - #32995
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In previously, when enabling 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. There are other implements of this dns cache: 1. kaka11chen@36fed13 This is for BE side, but it does not handle the IP change case. 3. apache#28479 This is for FE side, but it can only work with Master FE. Other FE node will not be aware of the IP change. And there are a bunch of BackendServiceProxy, this PR only handle cache in one of them.
doris-robot
commented
Mar 28, 2024
Thank you for your contribution to Apache Doris. Since 2024-03-18, the Document has been moved to doris-website. |
morningman
commented
Mar 28, 2024
ContributorAuthor
run buildall |
| return Status::OK(); | ||
| } | ||
| void DNSCache::_refresh_cache() { |
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warning: method '_refresh_cache' can be made const [readability-make-member-function-const]
Suggested change
| voidDNSCache::_refresh_cache() { | |
| voidDNSCache::_refresh_cache() const{ |
be/src/util/dns_cache.h:46:
- void _refresh_cache();+ void _refresh_cache() const;| // update cache at fix internal | ||
| void _refresh_cache(); | ||
| private: |
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warning: redundant access specifier has the same accessibility as the previous access specifier [readability-redundant-access-specifiers]
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| private: |
Additional context
be/src/util/dns_cache.h:40: previously declared here
private:
^doris-robot
commented
Mar 28, 2024
TPC-H: Total hot run time: 50557 ms |
doris-robot
commented
Mar 28, 2024
TeamCity be ut coverage result: |
doris-robot
commented
Mar 28, 2024
TPC-DS: Total hot run time: 203563 ms |
doris-robot
commented
Mar 28, 2024
ClickBench: Total hot run time: 30.42 s |
doris-robot
commented
Mar 28, 2024
Load test result on machine: 'aliyun_ecs.c7a.8xlarge_32C64G' |
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Aug 16, 2024
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bp #32869