New subject: dispatcher.list reversed by dispatch.c reindex_dests()

19 Sep 2015

Hello,

dispatcher gives me destination sets with entries in reverse order:

I have installed from Kamailio deb repository packages version
4.3.2+jessie.

# kamailio -V
version: kamailio 4.3.2 (x86_64/linux)
flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS,
USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM,
SHM_MMAP, PKG_MALLOC, F_MALLOC, DBG_F_MALLOC, USE_FUTEX,
FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE, USE_DNS_FAILOVER,
USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN
16, MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 4.9.2

I configured dispatcher:

modparam("dispatcher", "use_default", 1)
modparam("dispatcher", "list_file", "/etc/kamailio/dispatcher.list")
modparam("dispatcher", "flags", 3)
modparam("dispatcher", "dst_avp", "$avp(AVP_DST)")
modparam("dispatcher", "grp_avp", "$avp(AVP_GRP)")
modparam("dispatcher", "cnt_avp", "$avp(AVP_CNT)")
modparam("dispatcher", "sock_avp", "$avp(AVP_SOCK)")
modparam("dispatcher", "ds_ping_interval", 5)
modparam("dispatcher", "ds_probing_mode", 1)

I have this dispatcher.list:

1 sip:192.168.1.144:5060 <http://192.168.1.144:5060> 2
1 sip:192.168.1.145:5060 <http://192.168.1.145:5060> 2
1 sip:192.168.1.146:5060 <http://192.168.1.146:5060> 2

2 sip:192.168.1.146:5060 <http://192.168.1.146:5060> 2
2 sip:192.168.1.145:5060 <http://192.168.1.145:5060> 2

So, I expect dispatcher to have:

set 1 first two destinations in distribution via hash on callid,
and third destination as failover (192.168.1.146
<http://192.168.1.146:5060>) .
set 2 all traffic on first destination, and if first fails, all
traffic will failover to second destination (192.168.1.145
<http://192.168.1.146:5060>).

Instead reindex_dests shuffle the sets upside down:

DEBUG: dispatcher [dispatch.c:375]: add_dest2list(): dest [1/1]
<sip:192.168.1.144:5060 <http://192.168.1.144:5060>>
DEBUG: dispatcher [dispatch.c:375]: add_dest2list(): dest [1/2]
<sip:192.168.1.145:5060 <http://192.168.1.145:5060>>
DEBUG: dispatcher [dispatch.c:375]: add_dest2list(): dest [1/3]
<sip:192.168.1.146:5060 <http://192.168.1.146:5060>>
DEBUG: dispatcher [dispatch.c:375]: add_dest2list(): dest [2/1]
<sip:192.168.1.146:5060 <http://192.168.1.146:5060>>
DEBUG: dispatcher [dispatch.c:375]: add_dest2list(): dest [2/2]
<sip:192.168.1.145:5060 <http://192.168.1.145:5060>>
DEBUG: dispatcher [dispatch.c:494]: reindex_dests(): found [2]
dest sets
DEBUG: dispatcher [dispatch.c:139]: ds_print_sets(): dst>> 2
sip:192.168.1.145:5060 <http://192.168.1.145:5060> 2 0 (,0,0)
DEBUG: dispatcher [dispatch.c:139]: ds_print_sets(): dst>> 2
sip:192.168.1.146:5060 <http://192.168.1.146:5060> 2 0 (,0,0)
DEBUG: dispatcher [dispatch.c:139]: ds_print_sets(): dst>> 1
sip:192.168.1.146:5060 <http://192.168.1.146:5060> 2 0 (,0,0)
DEBUG: dispatcher [dispatch.c:139]: ds_print_sets(): dst>> 1
sip:192.168.1.145:5060 <http://192.168.1.145:5060> 2 0 (,0,0)
DEBUG: dispatcher [dispatch.c:139]: ds_print_sets(): dst>> 1
sip:192.168.1.144:5060 <http://192.168.1.144:5060> 2 0 (,0,0)
DEBUG: dispatcher [dispatcher.c:347]: mod_init(): loaded
dispatching list

So, Kamailio give me set 1 and set 2 as per post-reindex_dests,
and failover is 192.168.1.144 for set 1, and 192.168.1.146 for set 2.

Is this the expected behavior?
Am I doing something wrong in configuration?

Thank you all in advance,

-giovanni

Sincerely,

Giovanni Maruzzelli
Cell : +39-347-2665618 <tel:%2B39-347-2665618>