Marcel, thanks for the links and Dmitry thanks for coordinating this.
A couple notes from my memory:
iOS: EventLogging.h https://git.wikimedia.org/blob/apps%2Fios%2Fwikipedia.git/HEAD/Wikipedia%2FEventLogging%2FEventLoggingFunnel.h#L12 defines WMFEventLoggingMaxStringLength_Snippet and WMFEventLoggingMaxStringLength_General, which are only currently used for Share a Fact in WMFShareFunnel.m https://git.wikimedia.org/blob/apps%2Fios%2Fwikipedia.git/HEAD/Wikipedia%2FView%20Controllers%2FShareCard%2FWMFShareFunnel.m . Not sure if URL-encoding on the request path or actual database bytes (Unicode?) occupied causes overflows despite this.
As I recall, Android does something similar on Share a Fact ( ShareAFactFunnel.java https://git.wikimedia.org/blob/apps%2Fandroid%2Fwikipedia.git/HEAD/wikipedia%2Fsrc%2Fmain%2Fjava%2Forg%2Fwikipedia%2Fanalytics%2FShareAFactFunnel.java#L19). Same thing here with URL-encoding and actual database bytes (Unicode?).
-Adam
On Fri, May 15, 2015 at 1:21 PM, Marcel Ruiz Forns mforns@wikimedia.org wrote:
Dmitry,
you're totally right, it was in the email, but it should have been in the wikis. I added some documentation on it here: https://wikitech.wikimedia.org/wiki/EventLogging#Log_size_limit
Thanks!
On Fri, May 15, 2015 at 10:00 PM, Dmitry Brant dbrant@wikimedia.org wrote:
[brain fart] it's in your email. :( Thanks!
On Fri, May 15, 2015 at 3:59 PM, Dmitry Brant dbrant@wikimedia.org wrote:
Thanks for reporting this, Marcel! I've created a task for us to correct the behavior of our EL funnels: https://phabricator.wikimedia.org/T99276
Is the actual character limit of EL messages specified somewhere?
-Dmitry
On Fri, May 15, 2015 at 3:41 PM, Marcel Ruiz Forns <mforns@wikimedia.org
wrote:
Hi Mobile,
Analyzing EventLogging logs we percieved that a significant share of MobileWikiAppSavedPages, MobileWikiAppArticleSuggestions and MobileWikiAppShareAFact events are failing validation.
*1) MobileWikiAppShareAFact: 1.5% not validating* In this schema, the field "text" stores long fractions of text sometimes. This exceeds the size limitation of EL, specially when the text contains special characters, like chinese, greek, etc.
*2) MobileWikiAppArticleSuggestions: 1% not validating* In this case, it's the field "readMoreList" that is sometimes very long, specially when it contains special characters. This, again, exceeds the log size limit.
*3) MobileWikiAppSavedPages: 1% not validating* Some events do not contain the required field "appInstallID".
In cases 1) and 2) the percentage is not big overall, but it can be that for a given language, a lot of events are lost.
EventLogging performance is not compromised by these validation errors, but we are receiving monitoring alerts, and would like to maintain the validation rate close to 100%.
Is it possible for you to somehow reduce the size of the logs of 1) and 2)? If so, have in mind that the log size limit is 1k, and that the highest priority for us would be 2).
Thank you!
Marcel
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