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Maps - move traffic to eqiad instead of codfw
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Now that the maps eqiad cluster is ready, it is time to actually send traffic there after some validation that this cluster is working correctly.

This requires at least:

  • adding the kartotherian eqiad as a backend to varnish
  • changing cache routing to eqiad -> direct and codf -> eqiad (this needs to be done in 2 separate commits)
  • since tile generation is more recent on eqiad, we might need a full cache purge to ensure coherence of tiles (@Yurik can you confirm?)

@BBlack : I'm probably missing steps in the above plan, could you check?

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Event Timeline

Gehel created this task.Sep 15 2016, 10:09 AM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptSep 15 2016, 10:09 AM
Gehel updated the task description. (Show Details)Sep 15 2016, 10:11 AM
Yurik added a comment.Sep 15 2016, 4:07 PM

I suspect that both databases / tilesets are fairly similar. Then again, we had some job scheduling issue recently, so maybe we should do a full maps cache flush just to be sure - but this will cause a big spike on the servers, especially right after the switchover). As one of the cache flushing option, we could flush one zoom level at a time.

ema moved this task from Triage to Caching on the Traffic board.Sep 30 2016, 3:11 PM
Yurik moved this task from Backlog to To-do on the Maps-Sprint board.Oct 12 2016, 6:39 PM

completed today?

completed today?

Yes, there was an unplanned incident with the codfw karthotherian service and we accelerated the move to cope.

Gehel closed this task as Resolved.Oct 24 2016, 9:46 AM

Resolved during maps incident as pointed out by @BBlack.