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Apache Hadoop YARN: Past, Present and Future
1.
1 © Hortonworks
Inc. 2011 – 2016. All Rights Reserved Apache Hadoop YARN: Past, Present and Future Melbourne, Aug.31 2016 Junping Du
2.
2 © Hortonworks
Inc. 2011 – 2016. All Rights Reserved Who.JSON { "name" : "Junping Du" , "job_title" : "Lead Software Engineer @ Hortonworks YARN core team", "experiences" : [ { "software_industry_years" : 10, "hadoop_experience" : "Hadoop contributor before YARN comes out, Apache Hadoop committer & PMC, Release Manager for Apache Hadoop 2.6", ”non_hadoop_experience" : “Architect in cloud computing and enterprise software" }], "email" : "junping_du@apache.org" }
3.
3 © Hortonworks
Inc. 2011 – 2016. All Rights Reserved What is Apache Hadoop YARN ? ⬢ YARN is short for “Yet Another Resource Negotiator” ⬢ Big Data Operating System –Resource Management and Scheduling –Support for “colorful” applications, like: Batch, Interactive, Real-Time, etc. ⬢ Enterprise adoption accelerating –Secure mode becoming more widespread –Multi-tenant support –Diverse workloads ⬢ SLAs –Tolerance for slow running jobs decreasing –Consistent performance desired
4.
4 © Hortonworks
Inc. 2011 – 2016. All Rights Reserved4 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Past
5.
5 © Hortonworks
Inc. 2011 – 2016. All Rights Reserved A brief Timeline 1st line of Code Open sourced First 2.0 alpha First 2.0 beta June-July 2010 August 2011 May 2012 August 2013 ⬢ Sub-project of Apache Hadoop ⬢ Releases tied to Hadoop releases ⬢ Alphas and betas
6.
6 © Hortonworks
Inc. 2011 – 2016. All Rights Reserved GA Releases 2.2 2.3 2.4 2.5 Oct. 2013 Feb. 2014 Apr. 2014 Aug. 2014 • 1st GA • MR binary compatibility • YARN API cleanup • Testing! • 1st Post GA • Bug fixes • Alpha features - Load simulator - LCE enhancements • RM Fail-over • CS Preemption • Timeline Service V1 • Writable REST APIs • Timeline Service V1 security
7.
7 © Hortonworks
Inc. 2011 – 2016. All Rights Reserved GA Releases (Recent + Planning) 2.6 2.7 2.8/2.9 3.0 Nov. 2014 Apr. 2015 2nd H 2016 (estimated) TBD • KMS • Long running service support • Rolling Upgrade • Node Label Support • Docker Container • Pluggable Authorization • Shared Resource Cache • Timeline Service V1.5 • Graceful Decommission • Log CLI Enhancement • Timeline Service V2
8.
8 © Hortonworks
Inc. 2011 – 2016. All Rights Reserved Outstanding YARN Features released in 2.6/2.7 Default Partition Partition B GPUs Partition C Windows JDK 8 JDK 7 JDK 7 ⬢ Rolling Upgrade Node Label Pluggable ACLs
9.
9 © Hortonworks
Inc. 2011 – 2016. All Rights Reserved Recent Maintenance Releases Updates ⬢ 2.6 and 2.7 maintenance releases are carried out –Only blockers and critical fixes are added ⬢ Apache Hadoop 2.6 –2.6.4 released in Feb. 2016 –2.6.3 released in Dec. 2015 –2.6.2 released in Oct. 2015 ⬢ Apache Hadoop 2.7 –2.7.3 released in Aug. 2016 –2.7.2 released in Jan. 2016 –2.7.1 released in Jul. 2015
10.
1 0 © Hortonworks Inc.
2011 – 2016. All Rights Reserved1 0 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Present
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1 1 © Hortonworks Inc.
2011 – 2016. All Rights Reserved YARN in Modern Data Architecture ⬢ Modern Data Architecture –Enable applications to have access to all your enterprise data through an efficient centralized platform –Supported with a centralized approach governance, security and operations –Versatile to handle any applications and datasets no matter the size or type ⬢ YARN’s Evolution –The “CORE” of Modern Data Architecture –Centralized resource management, high efficient scheduling, flexible resource model, isolation in security and performance, “colorful” applications support, etc.
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1 2 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Apache Hadoop YARN ResourceManager (active) ResourceManager (standby) NodeManager1 NodeManager2 NodeManager3 NodeManager4 Resources: 128G, 16 vcores Auto-calculate node resources Label: SAS Dynamically update node resources
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1 3 © Hortonworks Inc.
2011 – 2016. All Rights Reserved NodeManager Resource Management ⬢ Options to report NM resources based on node hardware –YARN-160 –Restart of the NM required to enable feature ⬢ Alternatively, admins can use the rmadmin command to update the node’s resources –YARN-291 –Looks at the dynamic-resource.xml –No restart of the NM or the RM required
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1 4 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Apache Hadoop YARN Scheduler Inter queue pre-emption Improvements to pre-emption Application Queue B – 25% Queue C – 25% Label: SAS (non-exclusive) Queue A – 50% Priority/FIFO, Fair ResourceManager (active) Application, Queue A, 4G, 1 vcore Support for application priority Reservation for application Support for cost based placement agent User
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1 5 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Capacity scheduler ⬢ Support for application priority within a queue –YARN-1963 –Users can specify application priority –Specified as an integer, higher number is higher priority –Application priority can be updated while it’s running ⬢ Improvements to reservations –YARN-2572 –Support for cost based placement agent added in addition to greedy ⬢ Queue allocation policy can be switched to fair sharing –YARN-3319 –Containers allocated on a fair share basis instead of FIFO
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1 6 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Capacity scheduler ⬢ Support for non-exclusive node labels –YARN-3214 –Improvement over partition that existed earlier –Better for cluster utilization ⬢ Improvements to pre-emption
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1 7 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Node 1 NodeManager Support added for graceful decomissioning 128G, 16 vcores Launch Applicaton 1 AMAM process/Docker container(alpha) Launch AM process via ContainerExecutor – DCE, LCE, WSCE. Monitor/isolate memory and cpu. Support added for disk and network isolation via CGroups(alpha) Apache Hadoop YARN Application Lifecycle ResourceManager (active) Request containers Allocate containers Support added to resize containers. Container 1 process/Docker container(alpha) Container 2 process/Docker container(alpha) Launch containers on node using DCE, LCE, WSCE. Monitor/isolate memory and cpu. Support added for disk and network isolation using Cgroups(alpha). History Server(ATS 1.5– leveldb + HDFS, JHS - HDFS) HDFS Log aggregation
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1 8 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Apache Hadoop YARN ⬢ Graceful decommissioning of NodeManagers –YARN-914 –Drains a node that’s being decommissioned to allow running containers to finish ⬢ Resource isolation support for disk and network –YARN-2619, YARN-2140 –Containers get a fair share of disk and network resources using CGroups –Alpha feature ⬢ Docker support in LinuxContainerExecutor –YARN-3853 –Support to launch Docker containers alongside process containers –Alpha feature
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1 9 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Apache Hadoop YARN ⬢ Support for container resizing –YARN-1197 –Allows applications to change the size of an existing container ⬢ ATS 1.5 –YARN-4233 –Store timeline events on HDFS –Better scalability and reliability
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2 0 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Operational support ⬢ Improvements to existing tools (like yarn logs) ⬢ New tools added (yarn top) ⬢ Improvements to the RM UI to expose more details about running applications
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2 1 © Hortonworks Inc.
2011 – 2016. All Rights Reserved2 1 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Future
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2 2 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Packaging Containers – Lightweight mechanism for packaging and resource isolation – Popularized and made accessible by Docker – Can replace VMs in some cases – Or more accurately, VMs got used in places where they didn’t need to be Native integration ++ in YARN – Support for “Container Runtimes” in LCE: YARN-3611 – Process runtime – Docker runtime
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2 3 © Hortonworks Inc.
2011 – 2016. All Rights Reserved APIs Applications need simple APIs Need to be deployable “easily” Simple REST API layer fronting YARN – https://issues.apache.org/jira/browse/YARN-4793 – [Umbrella] Simplified API layer for services and beyond Spawn services & Manage them
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2 4 © Hortonworks Inc.
2011 – 2016. All Rights Reserved YARN as a Platform YARN itself is evolving to support services and complex apps – https://issues.apache.org/jira/browse/YARN-4692 – [Umbrella] Simplified and first-class support for services in YARN Scheduling – Application priorities: YARN-1963 – Affinity / anti-affinity: YARN-1042 – Services as first-class citizens: Preemption, reservations etc
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2 5 © Hortonworks Inc.
2011 – 2016. All Rights Reserved YARN as a Platform (Contd) Application & Services upgrades – ”Do an upgrade of my Spark / HBase apps with minimal impact to end- users” – YARN-4726 Simplified discovery of services via DNS mechanisms: YARN-4757 YARN Federation – to infinity and beyond: YARN-2915
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2 6 © Hortonworks Inc.
2011 – 2016. All Rights Reserved YARN Service Framework Platform is only as good as the tools A native YARN framework – https://issues.apache.org/jira/browse/YARN-4692 – [Umbrella] Native YARN framework layer for services and beyond Slider supporting a DAG of apps: – https://issues.apache.org/jira/browse/SLIDER-875
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2 7 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Operational and User Experience Modern YARN web UI - YARN-3368 Enhanced shell interfaces Metrics: Timeline Service V2 – YARN-2928 Application & Services monitoring, integration with other systems First class support for YARN hosted services in Ambari – https://issues.apache.org/jira/browse/AMBARI-17353
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2 8 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Use-cases.. Assemble! YARN and Other Platform Services Storage Resource Management Security Service Discovery Management Monitoring Alerts Holiday Assembly HBase Web Server IOT Assembly Kafka Storm HBase Solr Governance MR Tez Spark …
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2 9 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Future Work List (I) ⬢ Arbitrary resource types –YARN-3926 –Admins can decide what resource types to support –Resource types read via a config file ⬢ New scheduler features –YARN-4902 –Support richer placement strategies such as affinity, anti-affinity ⬢ Distributed scheduling –YARN-2877, YARN-4742 –NMs run a local scheduler –Allows faster scheduling turnaround ⬢ YARN federation –YARN-2915 –Allows YARN to scale out to tens of thousands of nodes –Cluster of clusters which appear as a single cluster to an end user ⬢ Better support for disk and network isolation –Tied to supporting arbitrary resource types
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3 0 © Hortonworks Inc.
2011 – 2016. All Rights Reserved Future Work List (II) ⬢ Simplified and first-class support for services in YARN –YARN-4692 –Container restart (YARN-3988) •Allow container restart without losing allocation –Service discovery via DNS (YARN-4757) •Running services can be discovered via DNS –Allocation re-use (YARN-4726) •Allow AMs to stop a container but not lose resources on the node ⬢ Enhance Docker support –YARN-3611 –Support to mount volumes –Isolate containers using CGroups ⬢ ATS v2 Phase 2 –YARN-2928 (Phase 1), YARN-5355 (Phase 2) –Run timeline service on Hbase –Support for more data, better performance ⬢ Also in the pipeline –Switch to Java 8 with Hadoop 3.0 –Add support for GPU isolation –Better tools to detect limping nodes –New RM UI – YARN-3368
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3 1 © Hortonworks Inc.
2011 – 2016. All Rights Reserved HDP Evolution with Apache Hadoop YARN
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3 2 © Hortonworks Inc.
2011 – 2016. All Rights Reserved3 2 © Hortonworks Inc. 2011 – 2016. All Rights Reserved Thank you!
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