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User:Samtar/Why isn't ExternalLinksChange working

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ExternalLinksChange (an EventLogging schema) isn't working as expected

Bug

Expected behaviour

  1. Add an external link to any page on test.wikipedia
  2. Wait up to 1 hour
  3. Run a query on stat1003 and the change is logged

Real behaviour

  1. Add an external link to any page on test.wikipedia
  2. Wait up to 1 hour
  3. Run a query on stat1003 and the change is sometimes logged
  4. Wait longer
  5. Run a query on stat1003 and the change might be there
  6. Wait even longer
  7. Run a query on stat1003 and the change still isn't there
  8. Give up and conclude it's been missed (probably?)

What have we tried?

  • Making the change to articlespace on test.wikipedia - still randomly misses log entries
  • Adding a link which gets logged in the spam blacklist on test.wikipedia - blacklist logs, still randomly misses

Where should we debug?

  • Beta cluster would be good as we can tail the log and see what's going on - we should enable the schema there and get sudo (relevant) - Note.svg Not to be used as a development playground, but will be useful in later debugging
  • Labs project instance - asking -labs if this is a suitable use of an instance - Yes Currently setting up
  • Local MW install via vagrant - Note.svg Should probably do this anyway..

Useful links