matomo-org / matomo-org/plugin-QueuedTracking

Changing the Redis queue password deletes all queued events...

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#167 18 comments 0 reactions 0 assignees View on GitHub

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Dominant language
PHP
Stars
87
Forks
41
Avg merge
2d 18h
Merged PRs (30d)
7

Description

We just lost 230,000 events of customer data because we changed our Redis queue password from the settings. I can't imagine why one would ever intentionally issue a FLUSH command after a setting is updated. Or, if you knew about this why is not in all caps in that setting card.

We have to periodically cycle passwords for security. We need to be able to do that from our Matomo instance WITHOUT having our system purge our queued events.

That has to be a bug. That behavior is extremely harmful. We are trying to use this system at the scale of 10M hits/day. It's going to take days for us to try to reconstruct the lost data that the queueing system just purged unexpectedly.

Contributor guide

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First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No files or tests are named. Start by tracing the Redis queue password setting update path and where queued events are flushed; done means changing the password from Matomo no longer purges existing queued events, with coverage for password rotation preserving the queue.

Written by the indexing model from the issue text.

Assessment

Tech stack
php, redis
Domain
backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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