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Use consul if available when pausing Geo replication

Ian Baum requested to merge pause-replication-consul into master

What does this MR do?

When pausing replication, stores the LSN in consul when available instead of a local file. This will allow us to support pausing, resuming, and promoting from an LSN on Patroni clusters running on standby nodes.

Related issues

Related to gitlab#276472 (closed)

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion

Required

  • Merge Request Title, and Description are up to date, accurate, and descriptive
  • MR targeting the appropriate branch
  • MR has a green pipeline on GitLab.com
  • Pipeline is green on dev.gitlab.org if the change is touching anything besides documentation or internal cookbooks
  • trigger-package has a green pipeline running against latest commit

Expected (please provide an explanation if not completing)

  • Test plan indicating conditions for success has been posted and passes
  • Documentation created/updated
  • Tests added
  • Integration tests added to GitLab QA
  • Equivalent MR/issue for the GitLab Chart opened
Edited by Ian Baum

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