So: what is the planning for making sure this doesn't happen the next time around? :)
On Tue, Mar 1, 2016 at 5:26 AM, Joseph Allemandou <jallemandou@wikimedia.org
wrote:
Hi,
*TL,DR: Please don't use hive / spark / hadoop before next week.*
Last week the Analytics Team performed an upgrade to the Hadoop Cluster. It went reasonably well except for many of the hadoop processes were launched with a special option to NOT use utf-8 as default encoding. This issue caused trouble particularly in page title extraction and was detected last sunday (many kudos to the people having filled bugs on Analytics API about encoding :) We found the bug and fixed it yesterday, and backfill starts today, with the cluster recomputing every dataset starting 2016-02-23 onward. This means you shouldn't query last week data during this week, first because it is incorrect, and second because you'll curse the cluster for being too slow :)
We are sorry for the inconvenience. Don't hesitate to contact us if you have any question
-- *Joseph Allemandou* Data Engineer @ Wikimedia Foundation IRC: joal
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