A Multi Colored YARN

Vinod Kumar Vavilapalli
Apache Hadoop PMC, Co-founder of YARN project
Hortonworks Inc
A Multi-Colored YARN

2 © Hortonworks Inc. 2011 – 2016. All Rights Reserved
About.html
 Apache Hadoop PMC, ASF Member
 9 years of only Hadoop
– Finally the job-adverts asking for “10 years of Hadoop experience” have validity
 ’Rewritten’ the Hadoop processing side – Became Apache Hadoop YARN
 With me today
– Billie Rinaldi: VP Apache Accumulo, Apache Slider PMC, ASF Member
– Jayush Luniya: Apache Ambari PMC
– Vadim Vaks: Kickass field guy (Sr. Solutions Architect)

Hadoop Compute Platform Today
 Layers that enable applications and higher order
frameworks
 It’s all about data!
 Still a single colored yarn
 Apache Hadoop YARN pretty good at jobs, queries,
short running apps
– We will continue doing this
 Admins and admin tools (Ambari) takes care of
statically provisioned services

Hadoop Compute Platform Today
Platform Services
Storage
Resource
Management Security
Management
Monitoring
Alerts
Governance
MR Tez Spark …
 Run everything in a single secure, multi-
tenant, elastic Hadoop YARN cluster
– An ongoing journey
 Adding new ‘stuff’ to this stack is an
involved effort

Evolution of user focus
 A need for reuse, composition and to keep building ‘upwards’
 Applications & services & more complex combinations - Assembly
IOT ApplicationsApache Metron

IOT ApplicationsApache Metron
• Simplified deployment of an assembly
– Ready to go packages
– Discovery
– Resource/capacity planning
• Management / monitoring / metrics of assemblies!
– “Start / stop” my business app end-to-end
– “Tell me what’s happening with my business application”
– “I don’t care whether HBase RegionServer is down or not, is my assembly healthy?”
• Scale up/down the entire app!
– “I got more input coming in, I don’t care how you scale individual pieces, but do scale the entire machinery”
Emerging needs of the platform

Why on YARN?
 Manual plumbing is very tiresome, not repeatable
 Assemblies - similar to apps & services, but N x harder (because there are N services to
grapple with)
 Why not static allocations?
– Machines die
– Jobs (MapReduce, Spark) are tolerant of faults, but static services aren’t!
– Upfront capacity planning
– Cannot react to hardware or utilization changes without manual intervention
– Elasticity is a manual operation
 This is fundamentally the same resource-management problem that YARN is built to
address!

Why on YARN? Contd..
 The Apache Hadoop ecosystem knows Data services the best – YARN is data-first!
 Big Data use-cases don’t stop at Hadoop services and apps
– Hive for all data, summary in traditional on-demand DB for driving analysts
– Extracting results from HDP and hosting report servers, interactive Uis like Apache Zeppelin
 Users don’t care about this separation
– Big Data is already a huge cluster on one side
– Asking for another infrastructure & needing separate management of this other stuff is
burdensome
– Unified solution >> Silos

Hadoop Compute Platform Next
 A colorful, multi-threaded yarn
 For use-cases of various colors
 Today’s applications better
 Simplified long running applications
 Bring your app easily
https://www.flickr.com/photos/happyskrappy/15699919424

What is happening now?

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

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

Platform++
 YARN itself is evolving to support services and complex apps
– [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

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
 Easier container sizing models: Resource profiles: YARN-3926

Framework++
 Platform is only as good as the tools
 A native YARN framework
– [Umbrella] Native YARN framework layer for services and
beyond
 Slider supporting a DAG of apps:
– https://issues.apache.org/jira/browse/SLIDER-875

User facing and operational 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

Use-cases.. Assemble!
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 …

Take away..

Thank You
(Rest of) The demo Team
• Gour Saha
• Sidhartha Seethana
• Varun Vasudev
• Shane Kumpf
• Jaimin Jetly
• Yusaku Sako
• Yu Liu

A Multi Colored YARN

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