insert function runs forever if connection is lost, keeping the table locked

Hi,

running pg-jdbc 42.2.2.jre7 against

PostgreSQL 10.4 on x86_64-pc-linux-gnu, compiled by gcc (GCC) 4.8.5
20150623 (Red Hat 4.8.5-28), 64-bit

and using CallableStatement interface.
When the application crashes after cstmt.execute(), not closing or rolling
back anything the query stays active and keeps the table locked (the
function, uses in/out parameters and inserts to a table).
This would probably be the same if the client suddenly disconnects with a
open CallableStatement which was executed but not closed, committed or
rolled back.

The application in question is required to use CallableStatement.

I tried with settings

tcp_keepalives_idle
tcp_keepalives_interval
tcp_keepalives_count

all set to 2.

Doesn't help, the query is still listed as active and the table lock is
preventing other connections from doing anything for hours.

Is there any solution to this kind of deadlock caused by connection being
lost?
What i would expect to happen: The DB recognises the connection is gone
within 6 seconds and rolls back the transaction, thereby releasing the
lock.

Thanks in advance,

Pieter Zieschang

_________________________________________

Modis IT Outsourcing GmbH
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Amtsgericht Düsseldorf: HRB 78227
Geschäftsführer: Martin Wimmer, Andreas Buchelt

www.modis.de

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