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Maniphest T191940

Investigate 2018-04-10 global traffic drop
Closed, ResolvedPublic
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Assigned To
BBlack
Authored By
Krinkle
Apr 10 2018, 11:13 PM
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Referenced Files
F16916408: Screen Shot 2018-04-11 at 03.08.35.png
Apr 11 2018, 2:54 PM
F16916406: Screen Shot 2018-04-11 at 03.08.20.png
Apr 11 2018, 2:54 PM
F16905407: Screen Shot 2018-04-11 at 00.38.53.png
Apr 10 2018, 11:42 PM
F16905333: Screen Shot 2018-04-11 at 00.12.57.png
Apr 10 2018, 11:13 PM
F16905322: Screen Shot 2018-04-11 at 00.07.31.png
Apr 10 2018, 11:13 PM
F16905327: Screen Shot 2018-04-11 at 00.10.04.png
Apr 10 2018, 11:13 PM
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Aklapper
ayounsi
EddieGP
gerritbot
Ghouston
• Gilles
• Imarlier
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Description

Update: Incident report at https://wikitech.wikimedia.org/wiki/Incident_documentation/20180410-Routing

For about 54min from 22:46 - 23:40 on Tue 10 Apr, a significant amount of global traffic was unable to reach our data centres.

Varnish traffic (Grafana)
Screen Shot 2018-04-11 at 00.07.31.png (834×1 px, 98 KB)
Screen Shot 2018-04-11 at 00.38.53.png (812×2 px, 169 KB)

From 22:53 - 23:03 (10min), "Transmission cp10xx (eqiad)" was down 70% (dropped from 10 GBit/s to 3 GBit/s). The bottom lasted for about 5min (22:55 - 23:00).

From 22:46 - 23:24 (40min), "Transmission cp50x (eqsin)" was down 90% (dropped from 1.6 GBits to 0.12 Gbit/s). The bottom lasted about 30min (23:50 - 23:20).

Edit count (Grafana)
Screen Shot 2018-04-11 at 00.10.04.png (698×1 px, 101 KB)
Edit count (global) dropped from 800/min to 350/min (down 56%)
Varnish http (Grafana)
Screen Shot 2018-04-11 at 00.12.57.png (586×1 px, 102 KB)
Requests (total) dropped from 11M/min to 8M/min (down 30%)
Asia page views (Grafana)
Screen Shot 2018-04-11 at 03.08.20.png (474×1 px, 370 KB)
Screen Shot 2018-04-11 at 03.08.35.png (494×1 px, 175 KB)
Page views (1:100 samples) dropped from 170/min to <10/min (down 90%). This is based on client-side Geo and indicates that traffic was really down (as opposed to re-routed).

Details

SubjectRepoBranchLines +/-
Revert "Depolling eqsin due to router issue"operations/dnsmaster+0 -2
Customize query in gerrit

Related Objects

Event Timeline

Krinkle created this task.Apr 10 2018, 11:13 PM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptApr 10 2018, 11:13 PM
Krinkle added a project: Wikimedia-Incident.Apr 10 2018, 11:13 PM
Paladox subscribed.Apr 10 2018, 11:17 PM

I guess this is why en.wikipedia.org and phabricator.wikimedia.org would not load for me? (though gerrit.wikimedia.org loaded for me)

Ghouston subscribed.Apr 10 2018, 11:17 PM

They still don't load for me. I think this is about April 10, not April 11.

Ghouston added a comment.Apr 10 2018, 11:18 PM

Well, phabricator is fine.

Krinkle renamed this task from Investigate 2018-04-11 global traffic drop to Investigate 2018-04-10 global traffic drop.Apr 10 2018, 11:19 PM
Krinkle updated the task description. (Show Details)
Ghouston added a comment.Apr 10 2018, 11:21 PM

Just started working again.

EddieGP subscribed.Apr 10 2018, 11:22 PM
Ghouston added a comment.Apr 10 2018, 11:28 PM

And now dead again. Affects www.wikipedia.org, commons, wikidata, wiktionary.

Krinkle updated the task description. (Show Details)Apr 10 2018, 11:42 PM
Krinkle added a project: Performance-Team.
ayounsi subscribed.EditedApr 10 2018, 11:50 PM

This was caused by a change made for T191667, more specifically enabling nonstop-routing on cr1/2-eqiad and cr1-eqsin.
I applied the change to cr1-eqiad (redundant), cr2-esams (middle of the night), which went fine, cr1-eqsin, then cr2-eqiad.
First observations seems to indicate that it have triggered a bug on cr2-eqiad and at least withdrawn the prefixes advertised from eqiad.
Change have been rolledback 4min later.

cr1-eqsin was a different kind of partial routing daemon failure, where rpd was at 100% CPU and the router was dropping most of the traffic (alerting was flapping), but still advertising its prefixes.
Rolling back the change did not fix the issue, running a commit full neither (at least not promptly). The site has been depolled.
Router seems to be back to a healthy state now.

I will follow-up with the vendor.

• Marostegui subscribed.Apr 11 2018, 6:31 AM
MoritzMuehlenhoff subscribed.Apr 11 2018, 6:59 AM
• Mholloway subscribed.Apr 11 2018, 7:04 AM
Ladsgroup subscribed.Apr 11 2018, 9:44 AM
• Imarlier subscribed.Apr 11 2018, 12:28 PM
• ema triaged this task as High priority.Apr 11 2018, 12:43 PM
• ema moved this task from Backlog to Network on the Traffic board.
• Imarlier added a comment.Apr 11 2018, 1:04 PM

Change in observed performance due to depooling of Singapore:

Synthetic tests (from AWS Mumbai): https://grafana.wikimedia.org/dashboard/db/mumbai-webpagetest?orgId=1&from=1523361600000&to=1523448000000
Real-user data from India: https://graphite.wikimedia.org/render/?width=2154&height=1308&_salt=1523451743.114&target=removeAboveValue(frontend.navtiming_oversample.responseStart.by_country.IN.median%2C5000)&target=removeAboveValue(frontend.navtiming_oversample.domComplete.by_country.IN.median%2C5000)&target=frontend.navtiming_oversample.mediaWikiLoadComplete.by_country.IN.median&from=12%3A00_20180410&until=12%3A00_20180411
Real user data from Singapore: https://graphite.wikimedia.org/render/?width=2154&height=1308&_salt=1523451810.779&from=12%3A00_20180410&until=12%3A00_20180411&target=removeAboveValue(frontend.navtiming_oversample.responseStart.by_country.SG.median%2C5000)&target=removeAboveValue(frontend.navtiming_oversample.domComplete.by_country.SG.median%2C5000)&target=removeAboveValue(frontend.navtiming_oversample.mediaWikiLoadComplete.by_country.SG.median%2C5000)
Real user data from Japan: https://graphite.wikimedia.org/render/?width=2154&height=1308&_salt=1523451810.779&from=12%3A00_20180410&until=12%3A00_20180411&target=removeAboveValue(frontend.navtiming_oversample.responseStart.by_country.JP.median%2C5000)&target=removeAboveValue(frontend.navtiming_oversample.domComplete.by_country.JP.median%2C5000)&target=removeAboveValue(frontend.navtiming_oversample.mediaWikiLoadComplete.by_country.JP.median%2C5000)

Krinkle updated the task description. (Show Details)Apr 11 2018, 2:54 PM
gerritbot subscribed.Apr 11 2018, 4:05 PM

Change 425552 had a related patch set uploaded (by BBlack; owner: BBlack):
[operations/dns@master] Revert "Depolling eqsin due to router issue"

https://gerrit.wikimedia.org/r/425552

gerritbot added a project: Patch-For-Review.Apr 11 2018, 4:05 PM
gerritbot added a comment.Apr 11 2018, 4:07 PM

Change 425552 merged by BBlack:
[operations/dns@master] Revert "Depolling eqsin due to router issue"

https://gerrit.wikimedia.org/r/425552

ayounsi added a comment.Apr 11 2018, 4:37 PM

Incident report: https://wikitech.wikimedia.org/wiki/Incident_documentation/20180410-Routing

• Gilles subscribed.Apr 13 2018, 8:46 AM

Do you want to rephrase this task's description to be about the incident? As a "let's investigate what happened" task as it is now, it should be closed, because we now know what happened.

• Imarlier assigned this task to BBlack.Apr 16 2018, 8:03 PM
• Imarlier removed a project: Performance-Team.

Brandon - No further action for Performance on this. I'm assigning to you to close out or for further investigation, if any is needed.

Krinkle moved this task from Active investigation to Active Situation on the Wikimedia-Incident board.Jul 18 2018, 7:20 PM
Krinkle closed this task as Resolved.Jul 19 2018, 7:00 AM
Krinkle updated the task description. (Show Details)
Krinkle removed a project: Patch-For-Review.
BBlack moved this task from Network to Done on the Traffic board.Oct 8 2021, 6:01 PM
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