BEGIN:VCALENDAR VERSION:2.0 PRODID:icalendar-ruby CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:America/Los_Angeles BEGIN:DAYLIGHT DTSTART:20170312T030000 TZOFFSETFROM:-0800 TZOFFSETTO:-0700 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:PDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20171105T010000 TZOFFSETFROM:-0700 TZOFFSETTO:-0800 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:PST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20260428T205331Z UID:X1c2dw DTSTART;VALUE=DATE:20170913 DTEND;VALUE=DATE:20170914 CLASS:PUBLIC CREATED:20170830T110129 DESCRIPTION: On Sept 13\, join SF Python and learn more about how Cisco mov ed from TcL to Python\, how caching works\, and how Yahoo tackles scaling. Our generous sponsor Yelp will also provide pizza and beer for the eveni ng. \n\n Talk #1: A journey from TCL to Python by Sheng Wang and Varun Krishnan (20 mins) \n\n BRIEF DESCRIPTION \n\n This talk explains about ho w Network Automation in Cisco has evolved from Tcl to Python\, what were t he major technical challenges involved before the transition and how switc hing to Python has helped address many of those challenges. \n\n DETAILED ABSTRACT \n\n Network Test automation is becoming an increasingly critica l component in network product certification amongst large Tier-1 SPs and Web/DC customers. Tcl was the primary automation language in the industry and tons of script have been written based on Tcl. However\, due to the na ture of non-OOP and lack of extensive libraries\, engineers always found t hey were repeating themselves. This talk explains about how Network Automa tion in Cisco has evolved from Tcl to Python\, what were the major technic al challenges involved before the transition and how switching to Python h as helped address many of those challenges. The talk will include a brief introduction to CafyKit\, a Python-based automation infrastructure library created in-house at Cisco\, which aims at helping users develop platform- independent scripts and emphasizes the Python principle of "DRY". Thought processes behind building the library would also be shared with the audien ce to shed some light on how to go about designing better libraries. It wi ll also talk about how some python standard libraries like telnetlib\, pex pect\, paramiko\, multiprocessing and multi-threading were used in the pro cess along with the pros and cons of these libraries and the technical cho ices which have been made during the process. \n\n BIO \n\n Varun Krishnan is a Software developer at Cisco where he works on scaled systems. Curre ntly\, he is working on a python based automation framework for testing di stributed routing platforms. His interests include C and Python programmin g\, embedded development and listening to obscure podcasts \n\n Sheng Wang is also a Software developer at Cisco. \n\n Talk 2: All Things Cached by Grant Jenks (20 mins) \n\n BRIEF DESCRIPTION \n\n Caching is critical to the performance of web services and scientific systems. Today's computing puts a premium on memory while leaving gigabytes of disk space unused. Ide ally our cache systems would utilize both memory and disk to balance speed and space. Together we'll survey cache features\, backends\, and framewor ks and learn about DiskCache\, a fast Django-compatible disk backed cache. \n\n DETAILED ABSTRACT \n\n "Caching is often the best way to improve t he performance of services and systems. But caching is also complex and ha rd\, full of features and tradeoffs. There is a lot to consider when selec ting a cache: eviction policies\, object serialization\, maintaining a sep arate process or server\, synchronization support\, platform support and m ore. Together we will survey cache features\, backends\, and frameworks in Python. \nWe will then look at DiskCache\, a fast Django-compatible disk backed cache\, and see how it fits in the landscape of features and backen ds. DiskCache supports a number of use cases beyond the typical get\, set\ , and delete operations. Examples of accelerated serving of static files\, cross-process communication and synchronization\, analytics counters\, an d a persistent mapping will be explained. Benchmarks between DiskCache\, M emcached\, and Redis will also be shown. \nFinally we will see what makes DiskCache fast and understand the tradeoffs to be made between memory\, di sk and the network. Supporting the cache metadata in DiskCache is SQLite a nd with the right settings\, we can make it faster than Memcached." \n\n BIO \n\n Grant Jenks is a founding partner and consultant in online busine sses. His current roles range from building CRM-type solutions to mathemat ical modeling of markets and bidding. Previously he worked as a C/C++/C# c ompiler developer and found it lay directly at the intersection of his int erests in algorithms and performance. He enjoys the vibrant community arou nd Python and looks for opportunities to contribute. \n\n Talk #3: Honey\, I scaled up Python by Varun Varma (30-35 mins) \n\n BRIEF DESCRIPTION \n \n This talk will take you through the requirements\, problems\, design de cisions\, implementation details and lessons learned while building a plan etary scale network telemetry system at Yahoo. You’ll see all the joys a nd wonders of using Python for building a scalable\, distributed system an d all the mistakes (and their solutions too!) we made along the way. \n\n DETAILED ABSTRACT \n\n At the end of 2015\, Yahoo started to look for ne tworking telemetry and monitoring system to replace their existing set of tools. Our team set out features and operability criterion and\, sure enou gh\, did not find anything that met the requirements at ‘Yahoo Scale’. We decided to do greenfield development for this on our own. This talk ta kes you through the journey of building this system and deploying it to pr oduction\, the scaling issues we faced at each layer and how we powered th rough them. We will talk about the core framework we built\, the platform that was put on top of that and the finally the applications built on top of the platform. We will consider what all framework elements a distribut ed system needs (e.g. configuration and logging management\, distributed l ocking\, leader election\, work queue management\, caching\, federation\, instrumentation) and how we mapped these to the tech stack choices we made . You’ll see how we used Celery\, Yapsy and Django on top of Zookeeper\, Kafka\, Redis and MySQL to build this\, the mistakes we made\, the mistak es we thought we had made and how we solved performance and scaling proble ms. \n\n BIO \n\n Varun Varma is a Principal Engineer at Yahoo leading th e design and development of the Network Telemetry Platform. Over the cours e of his 19-year career\, he has worked on everything from embedded system s in start-ups to ad tech systems at web scale. \n\n Agenda: \n\n 6:00p - Check-in and mingle\, with food provided by our generous sponsor Yelp! \ n\n 7:05p - Welcome \n\n 7:10p - Announcements and main talk \n\n 7:30p - Doors Close \n\n 9:00p - More mingling \n\n 9:30p - Hard Stop \n\n SF Pyth on is run by volunteers aiming to foster the Python community in the Bay A rea. Please consider making a donation to SF Python and saying a big thank you to Yelp for providing pizza\, beer\, and the venue for this Wednesday 's meetup. \n\n Yelp sees 89 million mobile users and 79 million desktop u sers every month. Keeping everything running smoothly requires the best an d brightest in the industry. Their engineers come from diverse technical b ackgrounds and value digital craftsmanship\, open-source\, and creative pr oblem-solving. They write tests\, review code\, and push multiple times a day. Come out and talk to them. \n LAST-MODIFIED:20240728T211358 LOCATION:Yelp\, 140 Montgomery Street\, San Francisco\, CA ORGANIZER:mailto:grace@pybay.com SUMMARY:SF Python Presentation Night URL;VALUE=URI:https://ti.to/sf-python/Scaling-at-Reddit-and-Yahoo URL;VALUE=URI:https://ti.to/sf-python/Scaling-at-Reddit-and-Yahoo END:VEVENT BEGIN:VEVENT DTSTAMP:20260428T205331Z UID:X1c2dw1017805 DTSTART;TZID=America/Los_Angeles:20170913T180000 DTEND;TZID=America/Los_Angeles:20170913T213000 CLASS:PUBLIC CREATED:20170830T110141 LAST-MODIFIED:20171122T010414 ORGANIZER:mailto:grace@pybay.com SUMMARY:[SF Python Presentation Night] SF Python Meetup URL;VALUE=URI:https://ti.to/sf-python/Scaling-at-Reddit-and-Yahoo URL;VALUE=URI:https://ti.to/sf-python/Scaling-at-Reddit-and-Yahoo END:VEVENT END:VCALENDAR