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Schema change for making cuc_id in cu_changes unsigned
Closed, ResolvedPublic


Context: T283069: cu_changes auto_increment will hit its max value in wikidatawiki soon

  1. ALTERs to run: ALTER TABLE /*_*/cu_changes CHANGE cuc_id cuc_id INTEGER UNSIGNED NOT NULL AUTO_INCREMENT; (from
  2. Where to run those changes: all.dblist
  3. When to run those changes: At any time - It requires master or dc switchover. Writes on it is rather high. Also Wikidata/enwiki will run out of it in a year or two.
  4. If the schema change is backwards compatible: Yes
  5. If the schema change has been tested already on some of the test/beta wikis: Tested in beta cluster.
  6. if the data should be made available on the labs replicas and/or dumps: This table is fully private and under no circumstances it would be okay to replicate it to the cloud.


  • s1
    • eqiad
    • codfw
  • s2
    • eqiad
    • codfw
  • s3
    • eqiad
    • codfw
  • s4
    • eqiad
    • codfw
  • s7
    • eqiad
    • codfw
  • s8
    • eqiad
    • codfw
  • labswiki
  • labtestwiki

Event Timeline

LSobanski triaged this task as Medium priority.
LSobanski moved this task from Triage to Pending comment on the DBA board.
LSobanski subscribed.

Assigning to Stevie to confirm if this can go into Ready.

Kormat moved this task from Pending comment to Ready on the DBA board.
Kormat subscribed.
Marostegui moved this task from Ready to In progress on the DBA board.

I am going to try to get this done in codfw entirely before the switch. First I will run it on eqiad s6 hosts to make sure it is all good.

s6 eqiad

  • dbstore1005
  • db1180
  • db1173
  • db1168
  • db1165
  • db1155
  • db1140
  • db1131
  • db1113
  • db1098
  • db1096
  • clouddb1021
  • clouddb1019
  • clouddb1015

I haven't seen anything weird, so I am going to finish up s6 eqiad (not the master, as it requires a switch) and then deploy this change on all codfw sections.

s5 eqiad

  • dbstore1003
  • db1161
  • db1150
  • db1145
  • db1144
  • db1130
  • db1113
  • db1110
  • db1100
  • db1096

This is all done in codfw, waiting only for the DC switch.
s5 and s6 are also mostly done (only pending the masters in eqiad)

Marostegui updated the task description. (Show Details)

All done