[Engineering] Hadoop - Last week data needs to be backfilled

[Oliver Keyes]

Hey Joseph,

Thanks for letting us know. So we should delete and backfill last
week's data, for our regularly scheduled scripts?

On 1 March 2016 at 08:26, Joseph Allemandou <jallemandou at 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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-- 
Oliver Keyes
Count Logula
Wikimedia Foundation