4paradigm / 4paradigm/OpenMLDB
feat(api server): support show api servers
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api-server
enhancement
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描述
the api server's register info is not available from nameserver, this make it not possible to query api server info from sdk or command line, like SQL `SHOW COMPONENTS`
enhance #1232
To support show api servers:
1. in clustered mode: those info can be stored directly in zk, E.g `$root_path/apiservers`
- nameserver hold a cache set of all api servers, so it is as simple as query a RPC method from nameserver
- remember delete node info after api server lost for awhile
2. standalone mode:
- name server only hold the cache set, it do not write api server info into zk
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