Marcel, thanks for the links and Dmitry thanks for coordinating this.

A couple notes from my memory:

iOS:

EventLogging.h defines WMFEventLoggingMaxStringLength_Snippet and WMFEventLoggingMaxStringLength_General, which are only currently used for Share a Fact in WMFShareFunnel.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). 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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