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Gearman and asynchronous processing in PHP applications
- 1. Gearman and asynchronous processing in PHP applications Pham Cong Dinh (a.k.a pcdinh) @pcdinh on Twitter BarCampSaiGon 2010 Skunkworks @teamskunkworks on Twitter
- 2. The aim of my talk Discuss about a solution that helps scale your high traffic PHP web applications
- 3. Introduction PHP developer since 2002. 8 years in PHP development and counting Presenter at Hanoi PHP Day in 2008, 2009 Founder and maintainer of PHPVietnam mailing list (Google Group) since 2004 Very interested in Linux, server farm, big data, database, distributed processing, scalability, high performance web systems Involved in clip.vn development at Vega Corporation 1 year ago Software developer at Skunkworks
- 4. Agenda Challenges in developing large scale PHP applications for high traffic web sites Resolve the challenge: How to distribute workload Gearman: an open source high performance job server Develop PHP clients and workers Challenges in managing workers – a case study of Gearman Agent Manager
- 5. What is large scale? How high is high traffic? Challenges in developing large scale PHP applications for high traffic web sites (1)
- 6. Large Scale? Challenges in developing large scale PHP applications for high traffic web sites (2) Traffic Data graph Storage Code base Development team
- 7. Typical challenges: limitation of resources CPU Disk speed Memory Bandwidth: router, NIC Architecture: application and system Challenges in developing large scale PHP applications for high traffic web sites (3)
- 8. Major challenges No preparation for growth No idea on how to scale your application at a certain extent No in-depth understanding of your system No proper system capacity monitoring Lack of proper skills Challenges in developing large scale PHP applications for high traffic web sites (4)
- 9. Our challenge today Resolve the challenge: How to distribute workload (1) TOO MUCH WORKLOAD FOR A SINGLE SERVER
- 10. Many solutions Load balancing: Hardware: F5, Cisco Content Services Switch Software: Bind, LVS, HAProxy, Varnish ... Precalculate data Multi-tier application architecture Resolve the challenge: How to distribute workload (2)
- 11. Our solution today Queue up the workload Categorize workload pattern Optimize processing model, security Job server Resolve the challenge: How to distribute workload (3)
- 12. Is queuing the final answer? Keep up with peak workload? Handle backlog gracefully Resolve the challenge: How to distribute workload (4)
- 13. Concepts Synchronous and asynchronous Job, job queue and job server Who Used at LiveJournal, Yahoo!, Digg, BackType and many more Used at Vega (clip.vn, vega.com.vn) for sending mails. At Skunkworks? Gearman: an open source high performance job server (1)
- 14. Architecture Client Worker Job server Gearman: an open source high performance job server (2) Fail-over cluster
- 15. Features Fast Programming language neutral A bridge between a message queue server and a pub/sub engine Enables applications to outsource tasks to other servers in a synchronous or asynchronous manner Fault-tolerant Poison message and retries Persistent queues for background jobs Timeout Gearman: an open source high performance job server (3)
- 16. How it works Worker worker connects to all gearmand servers. worker registers what functions it supports. worker asks for jobs. if no jobs, sends command 'pre_sleep' to all gearmand's and sleeps. Client connect to gearmand. submit a job for a particular job name Gearmand acks the job, finds all sleeping workers related to the job. sends them all a 'noop' command to wake them up. Gearman: an open source high performance job server (4)
- 17. Use cases Long running processes: thumbnail generation, image resizing, order processing in e-commerce … High CPU or memory requirements: high volume data processing, MapReduce, log aggregation, video encoding Distributed and parallel processing Timing processing: incremental updates, data replication Limited rate FIFO processing Separation of concerns or security issues. Priority-aware system monitoring tasks: WonderProxy Gearman: an open source high performance job server (5)
- 18. PHP interface library to Gearman server PECL gearman: http://pecl.php.net/package/gearman or https://github.com/php/pecl-gearman Pear's Net_Gearman: http://pear.php.net/package/Net_Gearman Develop PHP clients and workers (1)
- 19. PHP Client = Job Sender Develop PHP clients and workers (2)
- 20. PHP Worker = Job Executor Develop PHP clients and workers (3)
- 21. Ease of use How to manage multiple worker processes for a single job: launch, reload, stop, add process ... Monitoring Centralized management over set of servers Web API (Restful) Challenges in managing workers – a case study of Gearman Agent Manager
- 22. Questions? @skunkworksvn, @pcdinh #barcampsaigon #teamskunkworks