Hello,
Here is an update on the ongoing work to move the links tables of
Commons to a dedicated cluster (x4).
On Monday, September 7th, we will switch production reads to the new x4
cluster. At this point, the x4 hosts are just replicas of the s4 hosts,
so the data served is identical.
On Tuesday, September 8th, we will take the x4 hosts out of that
replication and we will switch the writes to x4 as well. From that point
on, the affected tables will no longer be written to s4. They will
remain present in the wiki replicas, but will no longer receive any
updates. A wiki replica for x4 will be set up afterwards; this can't
happen earlier, as we do not have enough disk space to run replicas for
these tables on both clusters at the same time.
The following tables are affected by this move:
* linktarget
* externallinks
* pagelinks
* templatelinks
* categorylinks
* collation
* imagelinks
* globalimagelinks
* iwlinks
* existencelinks
* langlinks
The page and redirect tables will be present in both clusters.
Progress is tracked at: https://phabricator.wikimedia.org/T437108 and
https://phabricator.wikimedia.org/T437111
Background/rationale: https://phabricator.wikimedia.org/T398709
Thank you,
Alexander Vorwerk — IRC: Zabe
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