Remove guc idle_session_gang_timeout and replace it with gp_vmem_idle_resource_timeout in postgresql.conf.sample
I assume that is actually gp_vmem_idle_resource_timeout.
Someone in a greenplum group found this and apparently the guc is wrong.
@@ -503,7 +503,7 @@ log_autostats=off # print additional autostats information
#default_transaction_read_only = off
#default_transaction_deferrable = off
#session_replication_role = 'origin'
-#idle_session_gang_timeout = 18s # in milliseconds, 0 is disabled
+#gp_vmem_idle_resource_timeout = 18s # in milliseconds, 0 is disabled
#statement_timeout = 0 # in milliseconds, 0 is disabled
#lock_timeout = 0 # in milliseconds, 0 is disabled
#vacuum_freeze_min_age = 50000000
