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Lay `cluster.databases` configuration groundwork for database clustering

Authored by epriestley on Apr 9 2016, 1:04 PM.
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Ref T4571. This adds a new option which allows you to upgrade your one-host configuration to a multi-host configuration by configuring it.

Doing this currently does nothing. I wrote a lot of words about what it is supposed to do in the future, though.

Test Plan
  • Tried to configure the option in all the possible bad ways, got errors.
  • Read documentation.

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Event Timeline

epriestley retitled this revision from to Lay `cluster.databases` configuration groundwork for database clustering.
epriestley updated this object.
epriestley edited the test plan for this revision. (Show Details)
epriestley added a reviewer: chad.
chad edited edge metadata.
This revision is now accepted and ready to land.Apr 9 2016, 3:40 PM

general question here: this seems to support a single datacenter only. That is, to have failover in a different datacenter would require different config between different DCs. If not, phabricator might try to make cross DC requests if the master is unreachable.

Would it be possible to support DC aware cluster configuration?

Can you give me a scenario or list of scenarios where a Phabricator webserver would make a different decision and achieve a better outcome if it was datacenter-aware?

In the cases I can come up with, the outcome is not meaningfully better by adding datacenter awareness: we still fail or succeed in roughly the same manner. But I may just not be thinking of the same situation you are.

This revision was automatically updated to reflect the committed changes.