Pre-Submission Checklist

• [ X] Commit message has the format required by CONTRIBUTING guide
• [ X] Commits are split per component (core, individual modules, libs, utils, ...)
• [ X] Each component has a single commit (if not, squash them into one commit)
• [ X] No commits to README files for modules (changes must be done to docbook files
  in doc/ subfolder, the README file is autogenerated)

Type Of Change

• Small bug fix (non-breaking change which fixes an issue)
• [X ] New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would change existing functionality)

Checklist:

• PR should be backported to stable branches
• [ X] Tested changes locally
• [ X] Related to issue #2361

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.patch
• https://github.com/kamailio/kamailio/pull/2362.diff

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