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Put together multicluster configuration for mediawiki-config
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Description

We have a variety of per-cluster options now (should be all consolidated into CirrusSearch\ClusterSettings by now):

$wgCirrusSearchDefaultCluster
$wgCirrusSearchClusters
$wgCirrusSearchShardCount
$wgCirrusSearchReplicas
$wgCirrusSearchClientSideConnectTimeout
$wgCirrusSearchDropDelayedJobsAfter

Additionally there is one more new setting being added in https://gerrit.wikimedia.org/r/244247:

$wgCirrusSearchWriteClusters

We need to work up a patch that sets these all appropriately for the eqiad, codfw and labsearch clusters. This should be deployed after shipping gerrit 244247 with the list of clusters to write to (cherry-pick to prod seems easy enough if we can test and merge this wednesday-ish).

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EBernhardson raised the priority of this task from to Needs Triage.
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Change 246443 had a related patch set uploaded (by EBernhardson):
Enable config for all three search clusters, but only write to eqiad

https://gerrit.wikimedia.org/r/246443

Deskana subscribed.

Change 246443 merged by jenkins-bot:
Enable config for all three search clusters, but only write to eqiad

https://gerrit.wikimedia.org/r/246443