[jira] [Assigned] (IMPALA-10856) Show connections in the web UI

["Quanlong Huang (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-10856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Quanlong Huang reassigned IMPALA-10856:
---------------------------------------

    Assignee: sichun zhai

> Show connections in the web UI
> ------------------------------
>
>                 Key: IMPALA-10856
>                 URL: https://issues.apache.org/jira/browse/IMPALA-10856
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Quanlong Huang
>            Assignee: sichun zhai
>            Priority: Major
>              Labels: observability, ramp-up
>
> HS2 protocol allows for the session to independent from the connection. Clients like HUE that use connection pools may use a session across different connections. We correctly handle this in IMPALA-1653. After that, each session can be associated to more than one connections. It would be helpful to show these connections in the /sessions page of coordinator's web UI. Note that fe service threads actually maps to the number of connections, not sessions.
> BTW, the "Network Address" column only shows the first connection of a session. We should add all connections of it.
> The handler for the /sessions URL: [https://github.com/apache/impala/blob/5a9dcd108d8a1c6f3ea0062d8de750b6e41fb635/be/src/service/impala-http-handler.cc#L562]
> The web page template of the /sessions page:
> [https://github.com/apache/impala/blob/5a9dcd108d8a1c6f3ea0062d8de750b6e41fb635/www/sessions.tmpl]
> The connection-session relationship is maintained in connection_to_sessions_map_:
> [https://github.com/apache/impala/blob/5a9dcd108d8a1c6f3ea0062d8de750b6e41fb635/be/src/service/impala-server.h#L1433] 
> Each session also tracks its connections:
> [https://github.com/apache/impala/blob/5a9dcd108d8a1c6f3ea0062d8de750b6e41fb635/be/src/service/impala-server.h#L629]
> Connection info is defined here:
> [https://github.com/apache/impala/blob/5a9dcd108d8a1c6f3ea0062d8de750b6e41fb635/be/src/rpc/thrift-server.h#L96-L109]
> {code:cpp}
>   struct ConnectionContext {
>     TUniqueId connection_id;
>     Username username;
>     Username do_as_user;
>     TNetworkAddress network_address;
>     std::string server_name;
>     /// Used to pass HTTP headers generated by the input transport to the output transport
>     /// to be returned.
>     std::vector<std::string> return_headers;
>     std::string saml_response;
>     std::string saml_relay_state;
>     std::unique_ptr<TWrappedHttpRequest> request;
>     std::unique_ptr<TWrappedHttpResponse> response;
>   };
> {code}
> We should at least showing these fields: connection_id, username, do_as_user, network_address, server_name.
>  



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