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Apache Hadoop YARN 2015: Present and Future
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Apache Hadoop YARN 2015: Present and Future
1.
© Hortonworks Inc.
2015 Apache Hadoop YARN 2015 Present and Future Vinod Kumar Vavilapalli vinodkv [at] apache.org @tshooter Page 1
2.
© Hortonworks Inc.
2015 Who am I? • 7.75 Hadoop-years old – Don’t fall for the job postings asking for 10 years #Hadoop Experience yet • Past – 2007: Last thing at School – a two node Tomcat cluster. Three months later, first thing at job, brought down a 800 node cluster ;) – Team that ran Hadoop @ Yahoo! • Present: @Hortonworks • Two hats – Hortonworks: Hadoop MapReduce and YARN Development lead – Apache: Apache Hadoop PMC, Apache Member • Worked/working on – YARN, Hadoop MapReduce, HadoopOnDemand, CapacityScheduler, Hadoop security – Apache Ambari: Kickstarted the project’s first release – Stinger: High performance data processing with Hadoop/Hive • Lots of trouble shooting on clusters (@tshooter) • 99% + code in Apache, Hadoop – Open Source – Community driven Page 2 Architecting the Future of Big Data
3.
© Hortonworks Inc.
2015 Agenda • Apache Hadoop YARN : Overview • Past • Present • Future Page 3 Architecting the Future of Big Data
4.
© Hortonworks Inc.
2015 Overview The Why and the What Architecting the Future of Big Data Page 4
5.
© Hortonworks Inc.
2015 Why Hadoop YARN? • Resource Management • A messy problem – Multiple apps, frameworks, their life- cycles and evolution • Varied expectations – On isolation, capacity allocations, scheduling – Admin: “Best use of my cluster” – Users: “Get me as much as possible, as fast as possible” • Tenancy – “I am running this cluster for one user” – It almost never stops there – Groups, Teams, Users • Adhoc structures get bad real fast • What’s different? – Centered around Data • ‘iIities – Admission policies. Sharing. Security. Elasticity. SLAs. ROI Page 5 Architecting the Future of Big Data Data ? Applications Admins Users
6.
© Hortonworks Inc.
2015 What is Hadoop YARN? Page 6 HDFS (Scalable, Reliable Storage) YARN (Cluster Resource Management) Applications (Running Natively in Hadoop) • Store all your data in one place … (HDFS) • Interact with that data in multiple ways … (YARN Platform + Apps) • Scale as you go, shared, multi-tenant, secure … (The Hadoop Stack) Queues Admins/Users Cluster Resources Pipelines
7.
© Hortonworks Inc.
2015 Past A quick history Architecting the Future of Big Data Page 7
8.
© Hortonworks Inc.
2015 A brief Timeline before the BigBang • Sub-project of Apache Hadoop • Releases tied to Hadoop releases • Gmail like alphas and betas – In production at several large sites for MapReduce already by that time Page 8 Architecting the Future of Big Data 1st line of Code Open sourced First 2.0 alpha First 2.0 beta June-July 2010 August 2011 May 2012 August 2013
9.
© Hortonworks Inc.
2015 Apache Hadoop YARN releases • 15 October, 2013 • The 1st GA release of Apache Hadoop 2.x • YARN – First stable and supported release of YARN – Binary Compatibility for MapReduce applications built on Hadoop-1.x – YARN level APIs solidified for the future – Performance – Scale from the get-go! • Support for running Hadoop on Microsoft Windows • Substantial amount of integration testing with rest of projects in the ecosystem Page 9 Architecting the Future of Big Data Apache Hadoop 2.2
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© Hortonworks Inc.
2015 Releases (contd) • 24 February, 2014 • First post GA release for the year 2014 • Number of bug-fixes, enhancements • Alpha features in YARN – ResourceManager Failover – Application History Page 10 Architecting the Future of Big Data Apache Hadoop 2.3
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2015 Releases (contd) • 07 April, 2014 • YARN – ResourceManager Fail-over – Preemption aided Scheduling – Application History and Timeline Service V1 Page 11 Architecting the Future of Big Data Apache Hadoop 2.4
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2015 Releases (contd) • 11 August, 2014 • YARN – YARN's REST APIs – Submitting & killing applications. – Timeline Service V1 Security Page 12 Architecting the Future of Big Data Apache Hadoop 2.5
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2015 Present Architecting the Future of Big Data Page 13
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2015 Apache Hadoop releases (contd) • 18 November 2014 • Last major release at the time of this talk • YARN – Support for rolling upgrades – Support for long running services – Support for node labels – Alpha/Beta features: Time-based resource reservations, running applications natively in Docker containers Page 14 Architecting the Future of Big Data Apache Hadoop 2.6
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2015 Rolling Upgrades At a click of a button Architecting the Future of Big Data Page 15
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2015 Work preserving ResourceManager restart Page 16 Architecting the Future of Big Data • ResourceManager remembers some state • Reconstructs the remaining from nodes and apps
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2015 Work preserving NodeManager restart Page 17 Architecting the Future of Big Data • NodeManager remembers state on each machine • Reconnects to running containers
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2015 ResourceManager Fail-over • Active/Standby Mode • Depends on fast-recovery Page 18 Architecting the Future of Big Data ZooKeeper
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2015 YARN Rolling Upgrades Workflow Page 19 Architecting the Future of Big Data • Servers first – Masters followed by Slaves • Upgrade of Applications/Frameworks is decoupled!
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2015 YARN Rolling Upgrades Snapshot Page 20 Architecting the Future of Big Data
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2015 Stack Rolling Upgrades Page 21 Architecting the Future of Big Data Rolling Updates Session by Sanjay Radia Thursday April 16, 2015 11:45-12:25 @ Silver Hall
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2015 Services on YARN Architecting the Future of Big Data Page 22
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2015 Long running services • You could run them already before 2.6! • Enhancements needed – Logs – Security – Management/monitoring – Sharing and Placement – Discovery • Resource sharing across workload types • Fault tolerance of long running services – Work preserving AM restart – AM forgetting faults • Service registry • Project Slider: http://slider.incubator.apache.org/ • HBase, Storm, Kafka already! Page 23 Architecting the Future of Big Data “Bringing Long Running Services to Hadoop YARN” by Steve Loughran Thursday April 16, 2015 12:40-13:20 @ Copper Hall
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2015 Cluster Management Features Architecting the Future of Big Data Page 24
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2015 Preemption aided Scheduling • Admins – “Make the best use of cluster resources” • Users – “Give me resources fast” • Solution – Elastic queues – Loan idle capacities to others – Take it back on demand – Balance across queues: In – Balance across users in a queue: WIP Page 25 Architecting the Future of Big Data
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2015 Fine-grain isolation for multi-tenancy • Memory – Custom monitoring – Inelastic Resource • CPU – Cgroups on Linux – Elastic Resource • Support on Windows – WIP Page 26 Architecting the Future of Big Data
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2015 Multi-resource scheduling • Multi-dimensional bin-packing – Application A says “I want 8GB RAM and 2 CPUs” – Application B says “I want 1GB RAM and 10 CPUs” • Today – memory & cpu – Physical memory / virtual memory – Cpu Cores – Virtual cores • Scheduling constrained based on the “bottleneck” resource – Watch out for utilization drop on the non-scarce resource Page 27 Architecting the Future of Big Data
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2015 Node Labels • Partitions – Admin: “I have machines of different types” – Impact on capacity planning: “Hey, we bought those Windows machines” • Types – Exclusive: “This is my Precious!” – Non-exclusive: “I get binding preference. Use it for others when idle” • Constraints – “Take me to a machine running JDK version 9” – No impact on capacity planning – WIP Page 28 Architecting the Future of Big Data Default Partition Partition B Linux Partition C Windows JDK 8 JDK 7 JDK 7
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2015 Operational and Developer tooling Architecting the Future of Big Data Page 29
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2015 Application History and Timeline Service • Before – Few MR specific implementations: History and web-UI • Not just MR anymore! • History – “Why was my application slow?” – “Where did my containers run?” – MapReduce specific Job History Server – Need a generic solution beyond ResourceManager Restart • Run analytics on historical apps! – “User with most resource utilization” – “Largest application run” • Application Timeline – Framework specific event collection and UIs – “Show me the Counters for my running MapReduce task” – “Show me the slowest Storm stream processing bolt while it is running” • Present – A LevelDB based implementation – Integrated into MapReduce, Apache Tez, Apache Hive Page 30 Architecting the Future of Big Data
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2015 Other features • Web Services – No need for installed Hadoop Clients – Submit an app – Monitor / Kill it • Multi-homing Environments – Clients on a public networks – Cluster traffic on a private network – Fault tolerance – Security Page 31 Architecting the Future of Big Data
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2015 Future Architecting the Future of Big Data Page 32
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2015 Apache Hadoop releases (contd) • Hadoop 2.7 – Likely April 19-24 week, 2014 – Moving to JDK 7 and beyond • Future Page 33 Architecting the Future of Big Data Apache Hadoop 2.7, 2.8 and beyond
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2015 Future: Timeline Service Next Generation • Next generation – Today’s solution helped understand the space – Limited scalability and availability • Analyzing Hadoop Clusters is a big-data problem – Don’t want to throw away the Hadoop application metadata – Large scale – Enable near real-time analysis: “Find me the user who is hammering the FileSystem with rouge applications. Now.” • Timeline data stored in HBase and accessible to queries Page 34 Architecting the Future of Big Data
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2015 Future: Improved Usability • Generic run-time information – “What is my actual usage by the running container?” – “How many rack local containers did I get” – “How healthy is the scheduler” – “Why is my application stuck? What limits did it hit?” • With Timeline Service – Why is my application slow? – Why is my cluster slow? – Why is my application failing? – Why is my cluster down? – What happened with my application? Succeeded? – What happened in my clusters? • Collect and use past data – To schedule my application better – To do better capacity planning Page 35 Architecting the Future of Big Data
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2015 Future: Containerized Applications • Running Containerized Applications on YARN • Docker • Multiple use-cases – Run my existing service on YARN – Slider + Docker – Run my existing MapReduce application on YARN via a docker image Page 36 Architecting the Future of Big Data
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2015 Future: Scheduling • Support priorities across applications within the same queue • Policy Driven scheduling – “I want app level fairness in queue A, user level fairness in queue B, and throughput focus in all other queues” • Node anti-affinity – “Do not run two copies of my service daemon on the same machine” • Gang scheduling – “Run all of my app at once” • Dynamic scheduling of containers based on actual utilization • Stabilized App Reservations – “Create a reservation for my app with X resources to run at 6AM tomorrow” • Time based policies – “10% cluster capacity for queue A from 6-9AM, but 20% from 9-12AM” • Prioritized queues – Admin’s queue takes precedence over everything else • Lot more .. Page 37 Architecting the Future of Big Data
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2015 Future: More Resource Types • Node level Isolation and Cluster level Scheduling • Disks – Space – IOPS: Read/Write • Network – Incoming bandwidth – Outgoing bandwidth Page 38 Architecting the Future of Big Data
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2015 Thank you! Page 39 Architecting the Future of Big Data Sandbox: Hadoop in a VM! Questions Time!
Notes de l'éditeur
YARN is not the first general Resource Management platform. So what’s different? It’s data!
Queues reflect org structures. Hierarchical in nature.