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

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

Quanlong Huang created IMPALA-10856:
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             Summary: 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


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]



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