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Developing YARN Applications - Integrating natively to YARN July 24 2014
1.
Page1 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved Developing YARN Native Applications Arun Murthy – Architect / Founder Bob Page – VP Partner Products
2.
Page2 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved Topics Hadoop 2 and YARN: Beyond Batch YARN: The Hadoop Resource Manager • YARN Concepts and Terminology • The YARN APIs • A Simple YARN application • The Application Timeline Server Next Steps
3.
Page3 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved Hadoop 2 and YARN: Beyond Batch
4.
Page4 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved Hadoop 2.0: From Batch-only to Multi-Workload HADOOP 1.0 HDFS (redundant, reliable storage) MapReduce (cluster resource management & data processing) HDFS2 (redundant, reliable storage) YARN (cluster resource management) MapReduce (data processing) Others (data processing) HADOOP 2.0 Single Use System Batch Apps Multi Purpose Platform Batch, Interactive, Online, Streaming, …
5.
Page5 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved Key Driver Of Hadoop Adoption: Enterprise Data Lake Flexible Enables other purpose-built data processing models beyond MapReduce (batch), such as interactive and streaming Efficient Double processing IN Hadoop on the same hardware while providing predictable performance & quality of service Shared Provides a stable, reliable, secure foundation and shared operational services across multiple workloads Data Processing Engines Run Natively IN Hadoop BATCH MapReduce INTERACTIVE Tez STREAMING Storm IN-MEMORY Spark GRAPH Giraph ONLINE HBase, Accumulo OTHERS HDFS: Redundant, Reliable Storage YARN: Cluster Resource Management
6.
Page6 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved 5 Key Benefits of YARN 1. Scale 2. New Programming Models & Services 3. Improved Cluster Utilization 4. Agility 5. Beyond Java
7.
Page7 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved YARN Platform Benefits Deployment YARN provides a seamless vehicle to deploy your software to an enterprise Hadoop cluster Fault Tolerance YARN ‘handles’ (detects, notifies, and provides default actions) for HW, OS, JVM failure tolerance YARN provides plugins for the app to define failure behavior Scheduling (incorporating Data Locality) YARN utilizes HDFS to schedule app processing where the data lives YARN ensures that your apps finish in the SLA expected by your customers
8.
Page8 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved A Brief History of YARN Originally conceived & architected at Yahoo! Arun Murthy created the original JIRA in 2008 and led the PMC The team at Hortonworks has been working on YARN for 4 years 90% of code from Hortonworks & Yahoo! YARN battle-tested at scale with Yahoo! In production on 32,000+ nodes YARN Released October 2013 with Apache Hadoop 2
9.
Page9 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved YARN Development Framework YARN : Data Operating System °1 ° ° ° ° ° ° ° ° ° ° ° ° ° ° ° ° ° ° °° ° ° ° ° ° ° ° ° ° ° ° ° ° N HDFS (Hadoop Distributed File System) System Batch MapReduce Interactive Tez Engine Real-Time Slider Direct ISV Apps Scripting Pig SQL Hive Cascading Java Scala NoSQL HBase Accumulo Stream Storm API ISV Apps ISV Aps Applications Others Spark ISV Apps ISV Apps
10.
Page10 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved YARN Concepts
11.
Page11 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved Apps on YARN: Categories Type Definition Examples Framework / Engine Provides platform capabilities to enable data services and applications Twill, Reef, Tez, MapReduce, Spark Service An application that runs continuously Storm, HBase, Memcached, etc Job A batch/iterative data processing job that runs on a Service or a Framework - XML Parsing MR job - Mahout K-means algorithm YARN App A temporal job or a service submitted to YARN - HBase Cluster (service) - MapReduce job
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Page12 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved YARN Concepts: Container Basic unit of allocation Fine-grained resource allocation memory, CPU, disk, network, GPU, etc. • container_0 = 2GB, 1CPU • container_1 = 1GB, 6 CPU Replaces the fixed map/reduce slots from Hadoop 1 Capability Memory, CPU Container Request Capability, Host, Rack, Priority, relaxLocality Container Launch Context LocalResources - Resources needed to execute container application Environment variables - Example: classpath Command to execute
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Inc. 2011 – 2014. All Rights Reserved YARN Terminology ResourceManager (RM) – central agent –Allocates & manages cluster resources –Hierarchical queues NodeManager (NM) – per-node agent –Manages, monitors and enforces node resource allocations –Manages lifecycle of containers User Application ApplicationMaster (AM) Manages application lifecycle and task scheduling Container Executes application logic Client Submits the application Launching the app 1. Client requests ResourceManager to launch ApplicationMaster Container 2. ApplicationMaster requests NodeManager to launch Application Containers
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Inc. 2011 – 2014. All Rights Reserved YARN Process Flow - Walkthrough NodeManager NodeManager NodeManager NodeManager Container 1.1 Container 2.4 NodeManager NodeManager NodeManager NodeManager NodeManager NodeManager NodeManager NodeManager Container 1.2 Container 1.3 AM 1 Container 2.2 Container 2.1 Container 2.3 AM2 Client2 ResourceManager Scheduler
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Inc. 2011 – 2014. All Rights Reserved The YARN APIs
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Inc. 2011 – 2014. All Rights Reserved Node ManagerNode Manager APIs Needed Only three protocols Client to ResourceManager • Application submission ApplicationMaster to ResourceManager • Container allocation ApplicationMaster to NodeManager • Container launch Use client libraries for all 3 actions Package org.apache.hadoop.yarn.client.api provides both synchronous and asynchronous libraries Client Resource Manager Application Master Node Manager YarnClient Application Client Protocol AMRMClient NMClient Application Master Protocol App Container Container Management Protocol
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Page17 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved YARN – Implementation Outline 1. Write a Client to submit the application 2. Write an ApplicationMaster (well, copy & paste) “DistributedShell is the new WordCount” 3. Get containers, run whatever you want!
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Inc. 2011 – 2014. All Rights Reserved YARN – Implementing Applications What else do I need to know? Resource Allocation & Usage • ResourceRequest • Container • ContainerLaunchContext & LocalResource ApplicationMaster • ApplicationId • ApplicationAttemptId • ApplicationSubmissionContext
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Inc. 2011 – 2014. All Rights Reserved YARN – Resource Allocation & Usage ResourceRequest Fine-grained resource ask to the ResourceManager Ask for a specific amount of resources (memory, CPU etc.) on a specific machine or rack Use special value of * for resource name for any machine ResourceRequest priority resourceName capability numContainers
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Inc. 2011 – 2014. All Rights Reserved YARN – Resource Allocation & Usage Container The basic unit of allocation in YARN The result of the ResourceRequest provided by ResourceManager to the ApplicationMaster A specific amount of resources (CPU, memory etc.) on a specific machine Container containerId resourceName capability tokens
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Inc. 2011 – 2014. All Rights Reserved YARN – Resource Allocation & Usage ContainerLaunchContext & LocalResource The context provided by ApplicationMaster to NodeManager to launch the Container Complete specification for a process LocalResource is used to specify container binary and dependencies • NodeManager is responsible for downloading from shared namespace (typically HDFS) ContainerLaunchContext container commands environment localResources LocalResource uri type
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Inc. 2011 – 2014. All Rights Reserved The ApplicationMaster The per-application controller aka container_0 The parent for all containers of the application ApplicationMaster negotiates its containers from ResourceManager ApplicationMaster container is child of ResourceManager Think init process in Unix RM restarts the ApplicationMaster attempt if required (unique ApplicationAttemptId) Code for application is submitted along with Application itself
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Inc. 2011 – 2014. All Rights Reserved ApplicationSubmissionContext ApplicationSubmissionContext is the complete specification of the ApplicationMaster Provided by the Client ResourceManager responsible for allocating and launching the ApplicationMaster container ApplicationSubmissionContext resourceRequest containerLaunchContext appName queue
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Inc. 2011 – 2014. All Rights Reserved YARN Application API - Overview hadoop-yarn-client module YarnClient is submission client API Both synchronous & asynchronous APIs for resource allocation and container start/stop Synchronous: AMRMClient & AMNMClient Asynchronous: AMRMClientAsync & AMNMClientAsync
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Inc. 2011 – 2014. All Rights Reserved YARN Application API – YarnClient createApplication to create application submitApplication to start application Application developer provides ApplicationSubmissionContext APIs to get other information from ResourceManager getAllQueues getApplications getNodeReports APIs to manipulate submitted application e.g. killApplication
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Inc. 2011 – 2014. All Rights Reserved YARN Application API – The Client NodeManager NodeManager NodeManager NodeManager Container 1.1 Container 2.4 NodeManager NodeManager NodeManager NodeManager NodeManager NodeManager NodeManager NodeManager Container 1.2 Container 1.3 AM 1 Container 2.2 Container 2.1 Container 2.3 AM2 Client2 New Application Request: YarnClient.createApplication Submit Application: YarnClient.submitApplication 1 2 ResourceManager Scheduler
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Inc. 2011 – 2014. All Rights Reserved AppMaster-ResourceManager API AMRMClient - Synchronous API registerApplicationMaster unregisterApplicationMaster Resource negotiation addContainerRequest removeContainerRequest releaseAssignedContainer Main API – allocate Helper APIs for cluster information getAvailableResources getClusterNodeCount AMRMClientAsync – Asynchronous Extension of AMRMClient to provide asynchronous CallbackHandler Callback interaction model with ResourceManager onContainersAllocated onContainersCompleted onNodesUpdated onError onShutdownRequest
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Inc. 2011 – 2014. All Rights Reserved AppMaster-ResourceManager flow NodeManager NodeManager NodeManager NodeManager NodeManager NodeManager NodeManager AM registerApplicationMaster 1 4 AMRMClient.allocate Container 2 3 unregisterApplicationMaster ResourceManager Scheduler NodeManager NodeManager NodeManager NodeManager
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Inc. 2011 – 2014. All Rights Reserved AppMaster-NodeManager API For AM to launch/stop containers at NodeManager AMNMClient - Synchronous API Simple (trivial) APIs • startContainer • stopContainer • getContainerStatus AMNMClientAsync – Asynchronous Simple (trivial) APIs startContainerAsync stopContainerAsync getContainerStatusAsync Callback interaction model with NodeManager onContainerStarted onContainerStopped onStartContainerError onContainerStatusReceived
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Inc. 2011 – 2014. All Rights Reserved YARN Application API - Development Un-Managed Mode for ApplicationMaster Run the ApplicationMaster on your development machine rather than in-cluster • No submission client needed Use hadoop-yarn-applications-unmanaged-am-launcher Easier to step through debugger, browse logs etc. $ bin/hadoop jar hadoop-yarn-applications-unmanaged-am-launcher.jar Client –jar my-application-master.jar –cmd ‘java MyApplicationMaster <args>’
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Inc. 2011 – 2014. All Rights Reserved A Simple YARN Application
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Inc. 2011 – 2014. All Rights Reserved A Simple YARN Application Simplest example of a YARN application – get n containers, and run a specific Unix command on each. Minimal error handling, etc. Control Flow 1. User submits application to the Resource Manager • Client provides ApplicationSubmissionContext to the Resource Manager 2. App Master negotiates with Resource Manager for n containers 3. App Master launches containers with the user-specified command as ContainerLaunchContext.commands Code: https://github.com/hortonworks/simple-yarn-app
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Inc. 2011 – 2014. All Rights Reserved Simple YARN Application – Client Command to launch ApplicationMaster process
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Inc. 2011 – 2014. All Rights Reserved Simple YARN Application – Client Resources required for ApplicationMaster container ApplicationSubmissionContext for ApplicationMaster Submit application to ResourceManager
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Inc. 2011 – 2014. All Rights Reserved Simple YARN Application – AppMaster Steps: 1. AMRMClient.registerApplication 2. Negotiate containers from ResourceManager by providing ContainerRequest to AMRMClient.addContainerRequest 3. Take the resultant Container returned via subsequent call to AMRMClient.allocate, build ContainerLaunchContext with Container and commands, then launch them using AMNMClient.launchContainer – Use LocalResources to specify software/configuration dependencies for each worker container 4. Wait till done… AllocateResponse.getCompletedContainersStatuses from subsequent calls to AMRMClient.allocate 5. AMRMClient.unregisterApplication
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Inc. 2011 – 2014. All Rights Reserved Simple YARN Application – AppMaster Initialize clients to ResourceManager and NodeManagers Register with ResourceManager Initialize clients to ResourceManager and NodeManagers
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Page37 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved Simple YARN Application – AppMaster Setup requirements for worker containers Make resource requests to ResourceManager
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Inc. 2011 – 2014. All Rights Reserved Simple YARN Application – AppMaster Get containers from ResourceManager Launch containers on NodeManagers
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Inc. 2011 – 2014. All Rights Reserved Simple YARN Application – AppMaster Wait for containers to complete successfully Un-register with ResourceManager
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Inc. 2011 – 2014. All Rights Reserved Graduating from simple-yarn-app DistributedShell. Same functionality but less simple e.g. error checking, use of timeline server For a complex YARN app, see Tez Pre-warmed containers, sessions, etc. Look at MapReduce for even more excitement Data locality, fault tolerance, checkpoint to HDFS, security, isolation, etc Intra-application priorities (maps vs reduces) need complex feedback from ResourceManager (all at apache.org)
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Inc. 2011 – 2014. All Rights Reserved Application Timeline Server
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Inc. 2011 – 2014. All Rights Reserved Application Timeline Server Maintains historical state & provides metrics visibility for YARN apps Similar to MapReduce Job History Server Information can be queried via REST APIs ATS in HDP 2.1 is considered a Tech Preview Generic information • queue name • user information • information about application attempts • a list of Containers that were run under each application attempt • information about each Container Per-framework/application info Developers can publish information to the Timeline Server via the TimelineClient (from within a client), the ApplicationMaster, or the application's Containers.
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Inc. 2011 – 2014. All Rights Reserved Application Timeline Server App Timeline Server AMBARI Custom App Monitoring Client
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Inc. 2011 – 2014. All Rights Reserved Next Steps
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Inc. 2011 – 2014. All Rights Reserved hortonworks.com/get-started/YARN Setup HDP 2.1 environment Leverage Sandbox Review Sample Code & Execute Simple YARN Application https://github.com/hortonworks/simple-yarn-app Graduate to more complex code examples BUILD FLEXIBLE, SCALABLE, RESILIENT & POWERFUL APPLICATIONS TO RUN IN HADOOP
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Inc. 2011 – 2014. All Rights Reserved Hortonworks YARN Resources Hortonworks Web Site hortonworks.com/hadoop/yarn Includes links to blog posts YARN Forum Community of Hadoop YARN developers – collaboration and Q&A hortonworks.com/community/forums/forum/yarn YARN Office Hours Dial in and chat with YARN experts Next Office Hour: Thursday August 14 @ 10-11am PDT. Register: https://hortonworks.webex.com/hortonworks/onstage/g.php?t=a&d=628190636
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Page47 © Hortonworks
Inc. 2011 – 2014. All Rights Reserved And from Hortonworks University Hortonworks Course: Developing Custom YARN Applications Format: Online Duration: 2 Days When: Aug 18th & 19th (Mon & Tues) Cost: No Charge to Hortonworks Technical Partners Space: Very Limited Interested? Please contact lsensmeier@hortonworks.com
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Inc. 2011 – 2014. All Rights Reserved Stay in Touch! Join us for the full series of YARN development webinars: YARN Native July 24 @ 9am PT (recording link) Slider August 7 @ 9am PT (registration link) Tez August 21 @ 9am PT (registration link) Additional webinar topics are being added – watch the blog or visit Hortonworks.com/webinars http://hortonworks.com/hadoop/yarn
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