Hi All,
          we face a weird problem in our 3 node slony setup.

* node1 (db1.domain.tld )  is the master provider and node2
(db2.domain.tld ), node3  (db3.domain.tld ) are subscribers.
currently nodes have 5 replication sets and the replication is working
fine.
* the problem is sl_log_1 and sl_log_2 tables in node1 gets cleaned up
properly, but the tables in the node2 and node3 doesn't.  On node1 the
total number of rows in sl_log_1 table is 24845 and in sl_log_2 it is
0. whereas

node2:

                         relation                         |  size
----------------------------------------------------------+---------
 _mhb_replication.sl_log_2                                | 130 GB
 _mhb_replication.sl_log_2_idx1                           | 47 GB
 _mhb_replication.PartInd_mhb_replication_sl_log_2-node-1 | 30 GB

node3:
                         relation                         |  size
----------------------------------------------------------+--------
 _mhb_replication.sl_log_2                                | 133 GB
 _mhb_replication.sl_log_2_idx1                           | 47 GB
 _mhb_replication.PartInd_mhb_replication_sl_log_2-node-1 | 30 GB
 _mhb_replication.sl_log_1                                | 352 MB


in node2 and node3 could see the following lines frequently.

slon[20695]: [4031-1] FATAL  cleanupThread: "delete from
"_mhb_replication".sl_log_1 where log_origin = '1' and log_xid <
'2130551154'; delete from
slon[20695]: [4031-2]  "_mhb_replication".sl_log_2 where log_origin =
'1' and log_xid < '2130551154'; delete from
"_mhb_replication".sl_seqlog where
slon[20695]: [4031-3]  seql_origin = '1' and seql_ev_seqno <
'51449379'; select "_mhb_replication".logswitch_finish(); " - ERROR:
canceling statement
slon[20695]: [4031-4]  due to statement timeout
slon[20695]: [4032-1] DEBUG2 slon_retry() from pid=20695

please find the slony_tools.conf here
https://gist.github.com/clement1289/d928acb771ca01a89281 and sl_status
/sl_listen output here
https://gist.github.com/clement1289/88df40f77c03c691eee5 . Hoping for
some help.

Regards,
Clement