insert function runs forever if connection is lost, keeping the tablelocked

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От Pieter Zieschang
Тема insert function runs forever if connection is lost, keeping the tablelocked
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Msg-id OFB5D0986A.1485D837-ONC12582BA.00298984-C12582BA.0049EC12@LocalDomain
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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


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