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Category Archives: Mozilla Services

BrowserID outage last week


What happened? Last week (9 May 2012 23:24 PDT until the following morning at 07:20), BrowserID had an outage affecting 50% of login requests. Embarrassingly, we didn’t find out until a user filed bug 753728 with us. Root Cause To put it bluntly, human error. Specifically, the accidental draining of all nodes of a load […]

Sync meltdown presentation @ Mozilla


Before ‘The Sync Platform Meltdown, Explained‘ was posted, I did a “brown bag” presentation at Mozilla HQ explaining what happened. Here is the recorded stream, if you’d prefer this instead of reading the long post about it: -jv

The Sync Platform Meltdown, Explained


TL;DR: Recently, the Firefox Sync platform suffered serious performance degradation. We’d like to explain what happened, as well as the steps taken to deal with the issue from the perspective of Mozilla Services Operations (“Ops”). The Sync platform melted down after the release of Firefox 7… …to put it bluntly. This was the worst outage […]

Help Mozilla Services Operations debug what’s wrong with Sync


This post is for historical purposes only. Please do not send us any more log data at this time. Thank you!   TL;DR: Paste your most recent about:sync-log into a and send a link to @mozservices for us to check out. Sometimes when there’s a problem with Firefox Sync, Mozilla Services Operations (@mozservices) needs […]

Python Sync hotfix — Sync data not clearing correctly


Summary Since the Python Sync deployment, we’ve been receiving user reports of issues with clearing Sync data in Account Portal. After a couple weeks of investigation, we determined the root cause this morning (bug 670975) and will be pushing a hotfix at 3pm PDT today (bug 670993). The Problem While reviewing logs a few days […]