Arne Kepp ha scritto:
> To me that looks like the database server disappeared.
> 
> Is postgresql running on the same machine? Can you see whether it has a 
> log with errors?

This mail thread:
http://www.nabble.com/org.postgresql.util.PSQLException:-An-I-O-error-occured-while-sending-to-the-backend-td17096005.html

suggests some logging options that can be used to diagnose the problem.
In that thread case it seems the connection was being closed before
the sql statement was sent to the server. It may be we have the same
problem, but I'd like to know for sure.
Is TileCache doing any kind of parallel seeding, that is, sending
multiple requests in parallel?

Cheers
Andrea

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