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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