[jira] [Created] (IMPALA-9170) close idle connections without an associated session

["Xiaomin Zhang (Jira)" <ji...@apache.org>]

Xiaomin Zhang created IMPALA-9170:
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             Summary: close idle connections without an associated session
                 Key: IMPALA-9170
                 URL: https://issues.apache.org/jira/browse/IMPALA-9170
             Project: IMPALA
          Issue Type: Bug
          Components: Infrastructure
    Affects Versions: Impala 3.3.0
            Reporter: Xiaomin Zhang


With the fix of IMPALA-7802,  Impala now can close an idle connection after a configured interval. But it still leaves some connections opened which has no associated sessions:

[https://github.com/cloudera/Impala/blob/cdh6.2.1/be/src/service/impala-server.cc#L2078]

if (it == connection_to_sessions_map_.end()) return false;

Some clients like HUE could use different connections to check the query status or fetch result. In these cases, those connections have no associated sessions, and not added into the connection_to_sessions_map. This caused issues when we use Radware to load balance Impala, because Radware does not send FIN to close an idle connection, but require backend to close idle connections. 



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