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Hello,<br>
<br>
that hash function is intended for hashing alpha-numeric usernames
and has a fair distribution for such cases.<br>
<br>
I don't think is good for hashing numbers, at the end of a day, a
number is already like a hash code. You can use in the config file
modulo operation to select a particular destination based on a
number.<br>
<br>
Maybe if you explain what is your target to implement, we can
provide the right hints to do it.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<div class="moz-cite-prefix">On 6/6/12 6:09 PM, SamyGo wrote:<br>
</div>
<blockquote
cite="mid:CAJUJwtgwc5K=c3fG4xszcT+KQtnjRO099w+A=Kj7xX7rZw47_w@mail.gmail.com"
type="cite">Sorry for late reply: this wasn't very helpful. I
think Hashing algo code needs to get bit smarter. If there is any
possibility can you please let me know. !
<div> <br>
<br>
<div class="gmail_quote">On Mon, Jun 4, 2012 at 3:33 PM,
Daniel-Constantin Mierla <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:miconda@gmail.com"
target="_blank">miconda@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">To make
the life easier to spot the hash code in such case, I just
committed a small patch to print it for alg 7:<br>
<br>
<a moz-do-not-send="true"
href="http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=83a558fbad700198a8667ef01f756269d7e2c310"
target="_blank">http://git.sip-router.org/cgi-bin/gitweb.cgi/sip-router/?a=commit;h=83a558fbad700198a8667ef01f756269d7e2c310</a><br>
<br>
Should be easy to backport if other version is used.<br>
<br>
Cheers,<br>
Daniel
<div class="HOEnZb">
<div class="h5"><br>
<br>
On 6/4/12 12:23 PM, Carsten Bock wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
It's hard to say, most likely not. You find the used
hash-function here:<br>
<br>
841 unsigned int ds_get_hash(str *x, str *y)<br>
<a moz-do-not-send="true"
href="http://git.sip-router.org/cgi-bin/gitweb.cgi?p=sip-router;a=blob;f=modules_k/dispatcher/dispatch.c;h=ae0c51b122d34e29b3474957a64b24ff492cfcd5;hb=HEAD"
target="_blank">http://git.sip-router.org/cgi-bin/gitweb.cgi?p=sip-router;a=blob;f=modules_k/dispatcher/dispatch.c;h=ae0c51b122d34e29b3474957a64b24ff492cfcd5;hb=HEAD</a><br>
<br>
It was originally implemented to distribute usernames
to servers,<br>
which worked fine.<br>
<br>
Carsten<br>
<br>
2012/6/4 SamyGo <<a moz-do-not-send="true"
href="mailto:govoiper@gmail.com" target="_blank">govoiper@gmail.com</a>>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
Thanks Sir,<br>
<br>
Thats what I expected. Do you think this will change
if I use only two<br>
values with huge difference in each other, lets say
{26000,29000} ?<br>
<br>
Regards,<br>
Sammy<br>
<br>
On Mon, Jun 4, 2012 at 3:05 PM, Carsten Bock <<a
moz-do-not-send="true"
href="mailto:carsten@ng-voice.com" target="_blank">carsten@ng-voice.com</a>>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
Hi,<br>
<br>
this functionality uses a generic "hash" function
to generate an<br>
Integer-Value of the PVAR and then reduces this to
the number hosts in<br>
your destination set.<br>
If you have only using two different values of the
PVAR and only two<br>
hosts in the dispatcher list, it can likely
happen, that the same host<br>
is choosen. You should try a wider range of values
for your PVAR...<br>
(e.g. try 1000 different values), then you should
see a distribution.<br>
<br>
Carsten<br>
<br>
2012/6/4 SamyGo <<a moz-do-not-send="true"
href="mailto:govoiper@gmail.com" target="_blank">govoiper@gmail.com</a>>:<br>
<blockquote class="gmail_quote" style="margin:0 0
0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
Hi,<br>
<br>
No, nothing at all. I haven't went too deep into
debug logs but no<br>
internal<br>
error was appearing. Everything was as calm as
ever and I only get one<br>
destination uri.<br>
<br>
So maybe what I'm getting from your email is
that , for this to work the<br>
way<br>
I expect is to have more unique and random
values in my hash_pvar to get<br>
the<br>
required functionality.<br>
<br>
Thanks once again,<br>
BR<br>
SG<br>
<br>
On Mon, Jun 4, 2012 at 11:52 AM,
Daniel-Constantin Mierla<br>
<<a moz-do-not-send="true"
href="mailto:miconda@gmail.com"
target="_blank">miconda@gmail.com</a>>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0
0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">
Hello,<br>
<br>
do you get any errors in the log?<br>
<br>
Be aware that hash functions may return same
code for different input<br>
values. A hash function is guaranteed to
return same code for same<br>
input<br>
value, but there can be collisions of codes
for different values.<br>
<br>
Cheers,<br>
Daniel<br>
<br>
<br>
On 6/3/12 3:41 PM, SamyGo wrote:<br>
<br>
Hello,<br>
<br>
I'm having trouble using algorithm 7 in
dispatcher module. Here is my<br>
kamailio version. The problem is that despite
multiple dispatcher<br>
entries<br>
corresponding to one set all calls go only to
only one destination.<br>
<br>
<br>
[root@control1 ~]# kamailio -V<br>
version: kamailio 3.2.3 (x86_64/linux) 59f87e<br>
flags: STATS: Off, USE_IPV6, USE_TCP, USE_TLS,
TLS_HOOKS,<br>
USE_RAW_SOCKS,<br>
DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK,
SHM_MEM, SHM_MMAP, PKG_MALLOC,<br>
DBG_QM_MALLOC, USE_FUTEX,
FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE,<br>
USE_DNS_FAILOVER, USE_NAPTR,
USE_DST_BLACKLIST, HAVE_RESOLV_RES<br>
ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE
262144, MAX_LISTEN 16,<br>
MAX_URI_SIZE 1024, BUF_SIZE 65535, DEFAULT
PKG_SIZE 4MB<br>
poll method support: poll, epoll_lt, epoll_et,
sigio_rt, select.<br>
id: 59f87e<br>
compiled on 18:04:08 Apr 19 2012 with gcc
4.1.2<br>
[root@control1 ~]#<br>
<br>
Here is the dipacther module params.<br>
<br>
<br>
<br>
# ------- Load-balancer params ------<br>
modparam("dispatcher", "db_url", DBURL)<br>
modparam("dispatcher", "table_name",
"dispatcher")<br>
modparam("dispatcher", "setid_col", "setid")<br>
modparam("dispatcher", "destination_col",
"destination")<br>
modparam("dispatcher", "force_dst", 1)<br>
modparam("dispatcher", "flags", 3)<br>
modparam("dispatcher", "dst_avp",
"$avp(i:271)")<br>
modparam("dispatcher", "cnt_avp",
"$avp(i:273)")<br>
modparam("dispatcher", "ds_ping_from",
<a class="moz-txt-link-rfc2396E" href="sip:proxy@109.XXX.2XX.XX">"sip:proxy@109.XXX.2XX.XX"</a>)<br>
modparam("dispatcher", "ds_ping_interval",15)<br>
modparam("dispatcher", "ds_probing_mode", 1)<br>
modparam("dispatcher", "ds_ping_reply_codes",<br>
"class=2;code=403;code=404;code=484;class=3")<br>
modparam("dispatcher", "hash_pvar",
"$avp(i:274)")<br>
modparam("dispatcher", "ds_hash_size", 9)<br>
modparam("dispatcher", "ds_hash_initexpire",
60)<br>
<br>
<br>
<br>
Below is the function call based on avp(i:274)<br>
<br>
<br>
<br>
avp_db_query("select uid from uid_did_map
where accountcode =<br>
'$fU'","$avp(i:274)");<br>
xlog("L_INFO","$rm from $fu (IP:$si:$sp)
---------<br>
UID:'$avp(i:274)-----------'\n");<br>
ds_load_update();<br>
if(!ds_select_dst("1","7")) {<br>
sl_send_reply("500",
"No destination<br>
available");<br>
xlog("route[MAIN] :
$rm : No destinations<br>
available for $rd");<br>
exit;<br>
}<br>
<br>
<br>
I'm getting two different values for
avp(i:274) {26,29} but the<br>
destination are not hashed on its base.<br>
<br>
Please help.<br>
<br>
Regards,<br>
Sammy G.<br>
<br>
<br>
<br>
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<br>
--<br>
Daniel-Constantin Mierla - <a
moz-do-not-send="true"
href="http://www.asipto.com" target="_blank">http://www.asipto.com</a><br>
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href="http://asipto.com/u/katu"
target="_blank">http://asipto.com/u/katu</a><br>
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<a moz-do-not-send="true"
href="http://asipto.com/u/kpw"
target="_blank">http://asipto.com/u/kpw</a><br>
<br>
<br>
<br>
</blockquote>
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<br>
<br>
--<br>
Carsten Bock<br>
CEO (Geschäftsführer)<br>
<br>
ng-voice GmbH<br>
Schomburgstr. 80<br>
D-22767 Hamburg / Germany<br>
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<br>
_______________________________________________<br>
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sr-users mailing list<br>
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</blockquote>
<br>
<br>
</blockquote>
<br>
-- <br>
Daniel-Constantin Mierla - <a moz-do-not-send="true"
href="http://www.asipto.com" target="_blank">http://www.asipto.com</a><br>
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href="http://asipto.com/u/katu" target="_blank">http://asipto.com/u/katu</a><br>
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</div>
</blockquote>
</div>
<br>
</div>
</blockquote>
<br>
<pre class="moz-signature" cols="72">--
Daniel-Constantin Mierla - <a class="moz-txt-link-freetext" href="http://www.asipto.com">http://www.asipto.com</a>
<a class="moz-txt-link-freetext" href="http://twitter.com/#!/miconda">http://twitter.com/#!/miconda</a> - <a class="moz-txt-link-freetext" href="http://www.linkedin.com/in/miconda">http://www.linkedin.com/in/miconda</a>
Kamailio Advanced Training, Seattle, USA, Sep 23-26, 2012 - <a class="moz-txt-link-freetext" href="http://asipto.com/u/katu">http://asipto.com/u/katu</a>
Kamailio Practical Workshop, Netherlands, Sep 10-12, 2012 - <a class="moz-txt-link-freetext" href="http://asipto.com/u/kpw">http://asipto.com/u/kpw</a></pre>
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