[Tile-serving] [openstreetmap/osm2pgsql] Prepared statement doesn't exist through pgpool (#878)

[Simon Gabyshev]

I got pgpool and 3 psql 9.5 nodes. Periodically cron spawning a script to download changes from osm and upload them to nominatim.

```
/app/nominatim/build/osm2pgsql/osm2pgsql -klas --number-processes 1 -C 2000 -O gazetteer -d nominatim.nominatim -P 5432 -U n_user -H nominatim-pgpool-service.nominatim  /app/diff_53820819.osc
```

There is error during upload:


```
Reading in file: /app/diff_53820819.osc
Using XML parser.
node cache: stored: 0(-nan%), storage efficiency: -nan% (dense blocks: 0, sparse nodes: 0), hit rate: -nan%
Osm2pgsql failed due to ERROR: delete_rel failed: server closed the connection unexpectedly
    This probably means the server terminated abnormally
    before or while processing the request.
(7)
Arguments were: 80305167,
ERROR: Error from osm2pgsql, 1
```

Pgpool logs:

```
2018-10-09 10:57:41 ERROR: pid 58: Bind: cannot get parse message "delete_rel"
```

Looks like prepared statement was created on master node but tried to execute on slave.

Here is the pgpool configs:

```
listen_addresses = 'localhost'
port = 5432
socket_dir = '/var/run/postgresql'
pcp_port = 9898
pcp_socket_dir = '/var/run/postgresql'
enable_pool_hba = off
pool_passwd = 'pool_passwd'
authentication_timeout = 60
ssl = off
num_init_children = 32
max_pool = 4
child_life_time = 300
child_max_connections = 0
connection_life_time = 0
client_idle_limit = 0
log_destination = 'stderr'
print_timestamp = on
log_connections = off
log_hostname = off
log_statement = off
log_per_node_statement = off
log_standby_delay = 'none'
syslog_facility = 'LOCAL0'
syslog_ident = 'pgpool'
debug_level = 0
pid_file_name = '/var/run/postgresql/pgpool.pid'
logdir = '/var/log/postgresql'
connection_cache = on
reset_query_list = 'ABORT; DISCARD ALL'
replication_mode = off
replicate_select = off
insert_lock = on
lobj_lock_table = ''
replication_stop_on_mismatch = off
failover_if_affected_tuples_mismatch = off
load_balance_mode = off
ignore_leading_white_space = on
white_function_list = ''
black_function_list = 'nextval,setval'
master_slave_mode = off
master_slave_sub_mode = 'slony'
sr_check_period = 0
sr_check_user = 'nobody'
sr_check_password = ''
delay_threshold = 0
follow_master_command = ''
parallel_mode = off
pgpool2_hostname = ''
system_db_hostname  = 'localhost'
system_db_port = 5432
system_db_dbname = 'pgpool'
system_db_schema = 'pgpool_catalog'
system_db_user = 'pgpool'
system_db_password = ''
health_check_period = 0
health_check_timeout = 20
health_check_user = 'nobody'
health_check_password = ''
health_check_max_retries = 0
health_check_retry_delay = 1
failover_command = ''
failback_command = ''
fail_over_on_backend_error = on
search_primary_node_timeout = 10
recovery_user = 'nobody'
recovery_password = ''
recovery_1st_stage_command = ''
recovery_2nd_stage_command = ''
recovery_timeout = 90
client_idle_limit_in_recovery = 0
use_watchdog = off
trusted_servers = ''
ping_path = '/bin'
wd_hostname = ''
wd_port = 9000
wd_authkey = ''
delegate_IP = ''
ifconfig_path = '/sbin'
if_up_cmd = 'ifconfig eth0:0 inet $_IP_$ netmask 255.255.255.0'
if_down_cmd = 'ifconfig eth0:0 down'
arping_cmd = 'arping -U $_IP_$ -w 1'
clear_memqcache_on_escalation = on
wd_escalation_command = ''
wd_lifecheck_method = 'heartbeat'
wd_interval = 10
wd_heartbeat_port = 9694
wd_heartbeat_keepalive = 2
wd_heartbeat_deadtime = 30
heartbeat_destination0 = 'host0_ip1'
heartbeat_destination_port0 = 9694 
heartbeat_device0 = ''
wd_life_point = 3
wd_lifecheck_query = 'SELECT 1'
wd_lifecheck_dbname = 'template1'
wd_lifecheck_user = 'nobody'
wd_lifecheck_password = ''
relcache_expire = 0
relcache_size = 256
check_temp_table = on
memory_cache_enabled = off
memqcache_method = 'shmem'
memqcache_memcached_host = 'localhost'
memqcache_memcached_port = 11211
memqcache_total_size = 67108864
memqcache_max_num_cache = 1000000
memqcache_expire = 0
memqcache_auto_cache_invalidation = on
memqcache_maxcache = 409600
memqcache_cache_block_size = 1048576
memqcache_oiddir = '/var/log/pgpool/oiddir'
white_memqcache_table_list = ''
black_memqcache_table_list = ''
```


Does this issue related to osm2pgsql? According to docs pgpool support prepared statements.

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