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| author | Ben Busby <noreply+git@benbusby.com> | 2021-11-10 12:19:37 -0700 |
|---|---|---|
| committer | Ben Busby <noreply+git@benbusby.com> | 2021-11-10 12:19:37 -0700 |
| commit | 8ee4f308a47ea613a97493b8afbe1aed02f80036 (patch) | |
| tree | cbbd9c7a47ac807931e164f04a87bd55552d8a33 /config | |
| parent | 71fb89e02889ec64db3659ddf13740ac2fe22407 (diff) | |
| download | farside-8ee4f308a47ea613a97493b8afbe1aed02f80036.tar.gz | |
Prevent same instance from being selected twice in a row
Introduces a new db key "<service>-previous" to track which instance was
last selected for a particular service. This allows for filtering the
list of available instances to exclude the instance that was last
picked, to ensure a (slightly) more even distribution of traffic.
There's still the possiblity of the following scenario, however:
:service instances > 2
/:service request #1 -> instance #1
/:service request #2 -> instance #2
/:service request #3 -> instance #1
/:service request #4 -> instance #2
where there are many ignored instances for a particular service. One
possible solution would be to implement the "<service>-previous" value
to be a list, rather than a single value, and push to that list until
only one element is left in the original "instance" array after
filtering, and then delete the "<service>-previous" key.
Diffstat (limited to 'config')
| -rw-r--r-- | config/config.exs | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/config/config.exs b/config/config.exs index 3b9dfe6..c522a9f 100644 --- a/config/config.exs +++ b/config/config.exs @@ -2,8 +2,9 @@ import Config config :farside, redis_conn: "redis://localhost:6379", - fallback_str: "-fallback", update_file: ".update-results", service_prefix: "service-", + fallback_suffix: "-fallback", + previous_suffix: "-previous", services_json: "services.json", index: "index.eex" |