1298971 - notify: api requests to send notifications should be hashed and deduplicated server-side

Status: RESOLVED FIXED

(Taskcluster :: Services, defect)

Description

[Jonas Finnemann Jensen (:jonasfj)]

tc-client will automatically retry requests that fails..

To mitigate this the server-side should compute hash of address/subject/message or user/channel/message and remember the hash in-memory.
If the hash already exists in memory, it should reply 200, but not send the message twice.

in-memory dictionary of hashes should be rotated every 1 hour or so. So old entries can be deleted.

If we only have one web process this will work fairly well. Presumably we don't need multiple web-processes, if we do need multiple instances, we we have to back this by some cache like redis (which is greate as non-durable cache).