postgres-xc-general Mailing List for Postgres-XC

Hi all,

I have previously run successful tests with 2 datanodes and I'm trying to
run the same test with 3 datanodes.  I am able to create/drop tables and
insert/select rows from all 3 coordinators.  The test runs if I point it
at a single coordinator (doesn't matter which one) and set the number of
clients to 32.  Each datanode box is running
datanode+coordinator(master)+gtm_proxy and gtm is running on a 4th box.

I have upped max_pool_size on the coordinator and max_connections on the
datanode to 400.  I haven't upped max_prepared_transactions however I
don't think any of these single-row-and-table inserts will required a
prepared transaction unless _all_ transactions use them (do they? And if
they do, why does my 2-datanode test work?).


Problem 1: If I use a single client, inserts seem to get stuck after about
12 (running a batch file with 6014 individual insert statements).  The
process doing inserts (psql) just stops doing inserts and I don't see any
output anywhere.

Problem 2: If I use 64 clients connecting to all 3 coordinators (round
robin so approx. 21 clients each) I get 'Failed to get pooled connection'
errors.

Problem 3: If I get 'Failed to get pooled connection' errors, the cluster
is in a broken state from then on.  The only solution I've found is to
dropdb then createdb which usually can't be accomplished without stopping
the entire cluster and restarting it.

What am I doing wrong?

Chris...