This article helps understand why user is unable to close a hung session in Vertica
Environment
Vertica Version 12.0.4-9 and higher
Situation
The below transaction which is in the session can not be closed by close_session() command.
2025-07-18 06:31:06.082 DistCall Dispatch:0x7efea4ffd700-250000034f216e9 [Session] <WARNING> session v_vmart_005_node0014-21694:0x1ff1040 socket shutdown error: Transport endpoint is not connected
select close_session('v_vmart_005_node0014-21694:0x1ff1040'); does not respond.
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