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

_______________________________________________
Engineering mailing list
Engineering@lists.wikimedia.org
https://lists.wikimedia.org/mailman/listinfo/engineering