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#### Description
When a destination is selected using one of the hash algorithms (over Call-ID, From, etc.)
and destination is not available, then the next is selected. This causes the following problem :
All messages to the unavailable destination will be sent to the same unique destination.
This will cause that one destination will receive double load and the rest will continue with the same.
Solution : To better distribute messages, while also guaranteeing the same distribution of the hash, a re-hash of the hash is made.
As the rehash could select the same or other failed destination, it can rehash several times. The number of rehashes made is controlled by :
modparam("dispatcher", "ds_rehash_max", -1)
Which can take the following values :
-1 : The total count of destinations is used
0 : Disabled. Reverts to original implementation.
Positive number. Maximum number of rehashes.
You can view, comment on, or merge this pull request online at:
https://github.com/kamailio/kamailio/pull/2362
-- Commit Summary --
* dispatcher : better distribution when using hash and destination is not available.
-- File Changes --
M src/modules/dispatcher/dispatch.c (192)
M src/modules/dispatcher/dispatcher.c (103)
-- Patch Links --
https://github.com/kamailio/kamailio/pull/2362.patchhttps://github.com/kamailio/kamailio/pull/2362.diff
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Reply to this email directly or view it on GitHub:
https://github.com/kamailio/kamailio/pull/2362
Hello,
based on the discussions during the last online devel meeting, the plan
is to release the next major version (Kamailio v5.4.0) around the mid of
this summer.
Therefore I propose to freeze the development on Thursday, June 18,
2020. Then we will have about 4-6 weeks of testing before the release is
out. Master will be unfrozen when the branch 5.4 is created (usually
that was done after 3-4 weeks in the testing phase).
If you are planning to introduce new features in the 5.4 release series,
be sure you push them to master branch or create a pull request till the
freezing date.
If anyone else wants a different time line for 5.4.0 release, let us
know and we can discuss to match the best for everyone.
Cheers,
Daniel
--
Daniel-Constantin Mierla -- www.asipto.comwww.twitter.com/miconda -- www.linkedin.com/in/miconda
Funding: https://www.paypal.me/dcmierla
Hello, guys,
I developed a feature, which I called "feature/rehash_of_hash" and
wanted to push to github, for the maintainers to review it and see if
it could be accepted into kamailio.
it is related to the following post, which no one responded :-(
https://lists.kamailio.org/pipermail/sr-users/2020-June/109516.html
I wrote to that list with my work email. It seems, confirmation emails
for subscription to this list are been blocked by my work's email
servers, so I subscribed now with my personal email.
Basically, this is the issue, related to the dispatcher module .
If distribution is based on a hash of a header (Call-ID, From, etc)
and destination is not available, just a "next" is selected. That
causes that all calls are sent to the same destination.
I opened an issue with this :
https://github.com/kamailio/kamailio/issues/2361
I also opened a pull request with the solution.
https://github.com/kamailio/kamailio/pull/2362
I don't understand why it shows so many changes on my two modified
files. I forked, cloned to my notebook and pushed back.
For instance, lines 82 to 97 in src/modules/dispatcher/dispatch.c ,
which I did not modify.
What did I do wrong?
Best regards,
Luis