Rohith Sharma, Naganarasimha, and Sunil presented on Hadoop cluster configurations and anti-patterns. They discussed sample node manager configurations with high resources, related YARN and MapReduce resource tuning settings, and anti-patterns like not configuring container heap size properly leading to out of memory errors. They also covered YARN capacity scheduler queue planning best practices like queue mapping, preemption, user limits, and application priority to improve cluster utilization.
Hadoop Summit San Jose 2015: Towards SLA-based Scheduling on YARN Clusters Sumeet Singh
In this talk, we look at YARN scheduler choices available today for Apache Hadoop 2 and discuss their pros and cons. We dive deeper into Capacity Scheduler by providing a comprehensive overview of its various settings with examples from real large-scale Hadoop clusters to promoter a broader understanding of schedulers’ current state and best practices in place today when it comes to queue nomenclature, planning, allocations, and ongoing management. We present detailed cluster, queue, and job behaviors from several different capacity management philosophies.
We then propose practical solutions without any change to the scheduler or core Hadoop that allows managing queue creations and capacity allocations while optimizing for cluster utilization and maintaining SLA guarantees. A unified queue nomenclature, admission and capacity re-allocation policies across BUs, applications, and clusters make service automation possible. Transparency in resources consumed allows for defining realistic SLA expectation. Finally, consistent application tagging completes the feedback loop with SLAs observed through application level reporting.
Hadoop Summit San Jose 2015: Towards SLA-based Scheduling on YARN Clusters Sumeet Singh
In this talk, we look at YARN scheduler choices available today for Apache Hadoop 2 and discuss their pros and cons. We dive deeper into Capacity Scheduler by providing a comprehensive overview of its various settings with examples from real large-scale Hadoop clusters to promoter a broader understanding of schedulers’ current state and best practices in place today when it comes to queue nomenclature, planning, allocations, and ongoing management. We present detailed cluster, queue, and job behaviors from several different capacity management philosophies.
We then propose practical solutions without any change to the scheduler or core Hadoop that allows managing queue creations and capacity allocations while optimizing for cluster utilization and maintaining SLA guarantees. A unified queue nomenclature, admission and capacity re-allocation policies across BUs, applications, and clusters make service automation possible. Transparency in resources consumed allows for defining realistic SLA expectation. Finally, consistent application tagging completes the feedback loop with SLAs observed through application level reporting.
Presentation from September, 2010 about the RTI proposal to improve the C++ API for the OMG's Data Distribution Service specification (DDS). See also http://code.google.com/p/dds-psm-cxx/.
As part of the recent release of Hadoop 2 by the Apache Software Foundation, YARN and MapReduce 2 deliver significant upgrades to scheduling, resource management, and execution in Hadoop.
At their core, YARN and MapReduce 2’s improvements separate cluster resource management capabilities from MapReduce-specific logic. YARN enables Hadoop to share resources dynamically between multiple parallel processing frameworks such as Cloudera Impala, allows more sensible and finer-grained resource configuration for better cluster utilization, and scales Hadoop to accommodate more and larger jobs.
Challenges & Capabilites in Managing a MapR Cluster by David TuckerMapR Technologies
"If you're using Hadoop in production, how do you manage it? Does the distribution you're using provide any tools to make the job easier? What are the pitfalls? Are there parts of the system that are less robust or that have problems more often? Are you running Hadoop on bare metal, or in a cloud environment, and is one easier than the other?"
MapR Senior Solutions Architect David Tucker speaks about the challenges and capabilites in managing a cluster. This talk was given at the SF Bay Area Large Scale Production Engineering Meetup (Sept 19, 2013).
Operating multi-tenant clusters requires careful planning of capacity for on-time launch of big data projects and applications within expected budget and with appropriate SLA guarantees. Making such guarantees with a set of standard hardware configurations is key to operate big data platforms as a hosted service for your organization.
This talk highlights the tools, techniques and methodology applied on a per-project or user basis across three primary multi-tenant deployments in the Apache Hadoop ecosystem, namely MapReduce/YARN and HDFS, HBase, and Storm due to the significance of capital investments with increasing scale in data nodes, region servers, and supervisor nodes respectively. We will demo the estimation tools developed for these deployments that can be used for capital planning and forecasting, and cluster resource and SLA management, including making latency and throughput guarantees to individual users and projects.
As we discuss the tools, we will share considerations that got incorporated to come up with the most appropriate calculation across these three primary deployments. We will discuss the data sources for calculations, resource drivers for different use cases, and how to plan for optimum capacity allocation per project with respect to given standard hardware configurations.
Hadoop World 2011: Next Generation Apache Hadoop MapReduce - Mohadev Konar, H...Cloudera, Inc.
The Apache Hadoop MapReduce framework has hit a scalability limit around 4,000 machines. In this session, we will be presenting the architecture and design of the next generation of MapReduce and will delve into the details of the architecture that makes it much easier to innovate. The architecture will have built in HA, security and multi-tenancy to support many users on the larger clusters. It will also increase innovation, agility and hardware utilization. We will also be presenting large scale and small scale comparisons on some benchmarks with MRV1.
Architectural Overview of MapR's Apache Hadoop Distributionmcsrivas
Describes the thinking behind MapR's architecture. MapR"s Hadoop achieves better reliability on commodity hardware compared to anything on the planet, including custom, proprietary hardware from other vendors. Apache HDFS and Cassandra replication is also discussed, as are SAN and NAS storage systems like Netapp and EMC.
The MapReduce model has become an important parallel processing model for large- scale data-intensive applications like data mining and web indexing. Hadoop, an open-source implementation of MapReduce, is widely applied to support cluster computing jobs requiring low response time. The current Hadoop implementation assumes that computing nodes in a cluster are homogeneous in nature. Data locality has not been taken into account for launching speculative map tasks, because it is assumed that most map tasks can quickly access their local data. Network delays due to data movement during running time have been ignored in the recent Hadoop research. Unfortunately, both the homogeneity and data locality assumptions in Hadoop are optimistic at best and unachievable at worst, potentially introducing performance problems in virtualized data centers. We show in this dissertation that ignoring the data-locality issue in heterogeneous cluster computing environments can noticeably reduce the performance of Hadoop. Without considering the network delays, the performance of Hadoop clusters would be significatly downgraded. In this dissertation, we address the problem of how to place data across nodes in a way that each node has a balanced data processing load. Apart from the data placement issue, we also design a prefetching and predictive scheduling mechanism to help Hadoop in loading data from local or remote disks into main memory. To avoid network congestions, we propose a preshuffling algorithm to preprocess intermediate data between the map and reduce stages, thereby increasing the throughput of Hadoop clusters. Given a data-intensive application running on a Hadoop cluster, our data placement, prefetching, and preshuffling schemes adaptively balance the tasks and amount of data to achieve improved data-processing performance. Experimental results on real data-intensive applications show that our design can noticeably improve the performance of Hadoop clusters. In summary, this dissertation describes three practical approaches to improving the performance of Hadoop clusters, and explores the idea of integrating prefetching and preshuffling in the native Hadoop system.
Presentation from September, 2010 about the RTI proposal to improve the C++ API for the OMG's Data Distribution Service specification (DDS). See also http://code.google.com/p/dds-psm-cxx/.
As part of the recent release of Hadoop 2 by the Apache Software Foundation, YARN and MapReduce 2 deliver significant upgrades to scheduling, resource management, and execution in Hadoop.
At their core, YARN and MapReduce 2’s improvements separate cluster resource management capabilities from MapReduce-specific logic. YARN enables Hadoop to share resources dynamically between multiple parallel processing frameworks such as Cloudera Impala, allows more sensible and finer-grained resource configuration for better cluster utilization, and scales Hadoop to accommodate more and larger jobs.
Challenges & Capabilites in Managing a MapR Cluster by David TuckerMapR Technologies
"If you're using Hadoop in production, how do you manage it? Does the distribution you're using provide any tools to make the job easier? What are the pitfalls? Are there parts of the system that are less robust or that have problems more often? Are you running Hadoop on bare metal, or in a cloud environment, and is one easier than the other?"
MapR Senior Solutions Architect David Tucker speaks about the challenges and capabilites in managing a cluster. This talk was given at the SF Bay Area Large Scale Production Engineering Meetup (Sept 19, 2013).
Operating multi-tenant clusters requires careful planning of capacity for on-time launch of big data projects and applications within expected budget and with appropriate SLA guarantees. Making such guarantees with a set of standard hardware configurations is key to operate big data platforms as a hosted service for your organization.
This talk highlights the tools, techniques and methodology applied on a per-project or user basis across three primary multi-tenant deployments in the Apache Hadoop ecosystem, namely MapReduce/YARN and HDFS, HBase, and Storm due to the significance of capital investments with increasing scale in data nodes, region servers, and supervisor nodes respectively. We will demo the estimation tools developed for these deployments that can be used for capital planning and forecasting, and cluster resource and SLA management, including making latency and throughput guarantees to individual users and projects.
As we discuss the tools, we will share considerations that got incorporated to come up with the most appropriate calculation across these three primary deployments. We will discuss the data sources for calculations, resource drivers for different use cases, and how to plan for optimum capacity allocation per project with respect to given standard hardware configurations.
Hadoop World 2011: Next Generation Apache Hadoop MapReduce - Mohadev Konar, H...Cloudera, Inc.
The Apache Hadoop MapReduce framework has hit a scalability limit around 4,000 machines. In this session, we will be presenting the architecture and design of the next generation of MapReduce and will delve into the details of the architecture that makes it much easier to innovate. The architecture will have built in HA, security and multi-tenancy to support many users on the larger clusters. It will also increase innovation, agility and hardware utilization. We will also be presenting large scale and small scale comparisons on some benchmarks with MRV1.
Architectural Overview of MapR's Apache Hadoop Distributionmcsrivas
Describes the thinking behind MapR's architecture. MapR"s Hadoop achieves better reliability on commodity hardware compared to anything on the planet, including custom, proprietary hardware from other vendors. Apache HDFS and Cassandra replication is also discussed, as are SAN and NAS storage systems like Netapp and EMC.
The MapReduce model has become an important parallel processing model for large- scale data-intensive applications like data mining and web indexing. Hadoop, an open-source implementation of MapReduce, is widely applied to support cluster computing jobs requiring low response time. The current Hadoop implementation assumes that computing nodes in a cluster are homogeneous in nature. Data locality has not been taken into account for launching speculative map tasks, because it is assumed that most map tasks can quickly access their local data. Network delays due to data movement during running time have been ignored in the recent Hadoop research. Unfortunately, both the homogeneity and data locality assumptions in Hadoop are optimistic at best and unachievable at worst, potentially introducing performance problems in virtualized data centers. We show in this dissertation that ignoring the data-locality issue in heterogeneous cluster computing environments can noticeably reduce the performance of Hadoop. Without considering the network delays, the performance of Hadoop clusters would be significatly downgraded. In this dissertation, we address the problem of how to place data across nodes in a way that each node has a balanced data processing load. Apart from the data placement issue, we also design a prefetching and predictive scheduling mechanism to help Hadoop in loading data from local or remote disks into main memory. To avoid network congestions, we propose a preshuffling algorithm to preprocess intermediate data between the map and reduce stages, thereby increasing the throughput of Hadoop clusters. Given a data-intensive application running on a Hadoop cluster, our data placement, prefetching, and preshuffling schemes adaptively balance the tasks and amount of data to achieve improved data-processing performance. Experimental results on real data-intensive applications show that our design can noticeably improve the performance of Hadoop clusters. In summary, this dissertation describes three practical approaches to improving the performance of Hadoop clusters, and explores the idea of integrating prefetching and preshuffling in the native Hadoop system.
Capacity Management and BigData/Hadoop - Hitchhiker's guide for the Capacity ...Renato Bonomini
Hadoop is a zoo of different types of workloads; even if most companies are simply using Hadoop to store information (HDFS), there are many other applications, to name a few hdfs, hive, pig, impala, spark, solr, flume.
Each animal in this zoo behaves differently and, for example, there are significant differences in the two most common workloads “MapReduce” and “HBase”
This leads to mainly three point of views for analysis to make sure service levels are achieved:
- Interest in response time for “interactive workload” CPU, Memory, Network and IO utilization levels to respond to queries in a quick and effective way
- Interest in high throughput for “batch workloads”: Maximize the utilization levels, not interested in response time
- Interest in planning storage capacity (filesystem and HDFS)
This speech focuses on providing guidelines for the capacity planner to understand how to translate existing techniques and framework and to adapt them to these new technologies: in most cases “what’s old is new again”
10 Popular Hadoop Technical Interview QuestionsZaranTech LLC
Big Data has been attested as one of the fastest growing technologies of this decade and thus potent enough to produce a large number of jobs. While enterprises across industrial stretch have started building teams, Hadoop technical interview questions could vary from simple definitions to critical case studies. Let’s take quick glimpse at the most obvious ones.
Big Data Testing : Automate theTesting of Hadoop, NoSQL & DWH without Writing...RTTS
Testing of Hadoop, NoSQL and Data Warehouses Visually
-----------------------------------------------------------------------------
We just made automated data testing really easy. Automate your Big Data testing visually, with no programming needed.
See how to automate Hadoop, No SQL and Data Warehouse testing visually, without writing any SQL or HQL. See how QuerySurge, the leading Big Data testing solution, provides novices and non-technical team members with a fast & easy way to be productive immediately while speeding up testing for team members skilled in SQL/HQL.
This webinar is geared towards:
- Big Data & Data Warehouse Architects, ETL Developers
- ETL Testers, Big Data Testers
- Data Analysts
- Operations teams
- Business Intelligence (BI) Architects
- Data Management Officers & Directors
You will learn how to:
• Improve your Data Quality
• Accelerate your data testing cycles
• Reduce your costs & risks
• Realize a huge ROI
DevoxxUK: Optimizating Application Performance on KubernetesDinakar Guniguntala
Now that you have your apps running on K8s, wondering how to get the response time that you need ? Tuning a polyglot set of microservices to get the performance that you need can be challenging in Kubernetes. The key to overcoming this is observability. Luckily there are a number of tools such as Prometheus that can provide all the metrics you need, but here is the catch, there is so much of data and metrics that is difficult make sense of it all. This is where Hyperparameter tuning can come to the rescue to help build the right models.
This talk covers best practices that will help attendees
1. To understand and avoid common performance related problems.
2. Discuss observability tools and how they can help identify perf issues.
3. Look closer into Kruize Autotune which is a Open Source Autonomous Performance Tuning Tool for Kubernetes and where it can help.
Cassandra Summit 2014: Cassandra Compute Cloud: An elastic Cassandra Infrastr...DataStax Academy
Presenter: Gurashish Brar, Member of Technical Staff at Bloomreach
Dynamically scaling Cassandra to serve hundreds of map-reduce jobs that come at an unpredictable rate and at the same time providing access to the data in real time to front-end application with strict TP95 latency guarantees is a hard problem. We present a system for managing Cassandra clusters which provide following functionality: 1) Dynamic scaling of capacity to serve high throughput map-reduce jobs 2) Provide access to data generated by map-reduce jobs in realtime to front-end applications while providing latency SLAs for TP95 3) Maintain a low cost by leveraging Amazon Spot Instances and through demand based scaling. At the heart of this infrastructure lies a custom data replication service that makes it possible to stream data to new nodes as needed.
YARN - way to share cluster BEYOND HADOOPOmkar Joshi
Describing YARN's architecture, Resource localization model, security and future work (like rm restart, RM -HA), contibuting to open source and hadoop.
May Marketo Masterclass, London MUG May 22 2024.pdfAdele Miller
Can't make Adobe Summit in Vegas? No sweat because the EMEA Marketo Engage Champions are coming to London to share their Summit sessions, insights and more!
This is a MUG with a twist you don't want to miss.
Introducing Crescat - Event Management Software for Venues, Festivals and Eve...Crescat
Crescat is industry-trusted event management software, built by event professionals for event professionals. Founded in 2017, we have three key products tailored for the live event industry.
Crescat Event for concert promoters and event agencies. Crescat Venue for music venues, conference centers, wedding venues, concert halls and more. And Crescat Festival for festivals, conferences and complex events.
With a wide range of popular features such as event scheduling, shift management, volunteer and crew coordination, artist booking and much more, Crescat is designed for customisation and ease-of-use.
Over 125,000 events have been planned in Crescat and with hundreds of customers of all shapes and sizes, from boutique event agencies through to international concert promoters, Crescat is rigged for success. What's more, we highly value feedback from our users and we are constantly improving our software with updates, new features and improvements.
If you plan events, run a venue or produce festivals and you're looking for ways to make your life easier, then we have a solution for you. Try our software for free or schedule a no-obligation demo with one of our product specialists today at crescat.io
Custom Healthcare Software for Managing Chronic Conditions and Remote Patient...Mind IT Systems
Healthcare providers often struggle with the complexities of chronic conditions and remote patient monitoring, as each patient requires personalized care and ongoing monitoring. Off-the-shelf solutions may not meet these diverse needs, leading to inefficiencies and gaps in care. It’s here, custom healthcare software offers a tailored solution, ensuring improved care and effectiveness.
Code reviews are vital for ensuring good code quality. They serve as one of our last lines of defense against bugs and subpar code reaching production.
Yet, they often turn into annoying tasks riddled with frustration, hostility, unclear feedback and lack of standards. How can we improve this crucial process?
In this session we will cover:
- The Art of Effective Code Reviews
- Streamlining the Review Process
- Elevating Reviews with Automated Tools
By the end of this presentation, you'll have the knowledge on how to organize and improve your code review proces
Artificia Intellicence and XPath Extension FunctionsOctavian Nadolu
The purpose of this presentation is to provide an overview of how you can use AI from XSLT, XQuery, Schematron, or XML Refactoring operations, the potential benefits of using AI, and some of the challenges we face.
A Study of Variable-Role-based Feature Enrichment in Neural Models of CodeAftab Hussain
Understanding variable roles in code has been found to be helpful by students
in learning programming -- could variable roles help deep neural models in
performing coding tasks? We do an exploratory study.
- These are slides of the talk given at InteNSE'23: The 1st International Workshop on Interpretability and Robustness in Neural Software Engineering, co-located with the 45th International Conference on Software Engineering, ICSE 2023, Melbourne Australia
Zoom is a comprehensive platform designed to connect individuals and teams efficiently. With its user-friendly interface and powerful features, Zoom has become a go-to solution for virtual communication and collaboration. It offers a range of tools, including virtual meetings, team chat, VoIP phone systems, online whiteboards, and AI companions, to streamline workflows and enhance productivity.
Why Mobile App Regression Testing is Critical for Sustained Success_ A Detail...kalichargn70th171
A dynamic process unfolds in the intricate realm of software development, dedicated to crafting and sustaining products that effortlessly address user needs. Amidst vital stages like market analysis and requirement assessments, the heart of software development lies in the meticulous creation and upkeep of source code. Code alterations are inherent, challenging code quality, particularly under stringent deadlines.
OpenMetadata Community Meeting - 5th June 2024OpenMetadata
The OpenMetadata Community Meeting was held on June 5th, 2024. In this meeting, we discussed about the data quality capabilities that are integrated with the Incident Manager, providing a complete solution to handle your data observability needs. Watch the end-to-end demo of the data quality features.
* How to run your own data quality framework
* What is the performance impact of running data quality frameworks
* How to run the test cases in your own ETL pipelines
* How the Incident Manager is integrated
* Get notified with alerts when test cases fail
Watch the meeting recording here - https://www.youtube.com/watch?v=UbNOje0kf6E
E-commerce Application Development Company.pdfHornet Dynamics
Your business can reach new heights with our assistance as we design solutions that are specifically appropriate for your goals and vision. Our eCommerce application solutions can digitally coordinate all retail operations processes to meet the demands of the marketplace while maintaining business continuity.
AI Fusion Buddy Review: Brand New, Groundbreaking Gemini-Powered AI AppGoogle
AI Fusion Buddy Review: Brand New, Groundbreaking Gemini-Powered AI App
👉👉 Click Here To Get More Info 👇👇
https://sumonreview.com/ai-fusion-buddy-review
AI Fusion Buddy Review: Key Features
✅Create Stunning AI App Suite Fully Powered By Google's Latest AI technology, Gemini
✅Use Gemini to Build high-converting Converting Sales Video Scripts, ad copies, Trending Articles, blogs, etc.100% unique!
✅Create Ultra-HD graphics with a single keyword or phrase that commands 10x eyeballs!
✅Fully automated AI articles bulk generation!
✅Auto-post or schedule stunning AI content across all your accounts at once—WordPress, Facebook, LinkedIn, Blogger, and more.
✅With one keyword or URL, generate complete websites, landing pages, and more…
✅Automatically create & sell AI content, graphics, websites, landing pages, & all that gets you paid non-stop 24*7.
✅Pre-built High-Converting 100+ website Templates and 2000+ graphic templates logos, banners, and thumbnail images in Trending Niches.
✅Say goodbye to wasting time logging into multiple Chat GPT & AI Apps once & for all!
✅Save over $5000 per year and kick out dependency on third parties completely!
✅Brand New App: Not available anywhere else!
✅ Beginner-friendly!
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✅Risk-Free: 30-Day Money-Back Guarantee!
✅Commercial License included!
See My Other Reviews Article:
(1) AI Genie Review: https://sumonreview.com/ai-genie-review
(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
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#WhatIsAIFusionBuddy?,
#HowDoesAIFusionBuddyWorks
AI Pilot Review: The World’s First Virtual Assistant Marketing SuiteGoogle
AI Pilot Review: The World’s First Virtual Assistant Marketing Suite
👉👉 Click Here To Get More Info 👇👇
https://sumonreview.com/ai-pilot-review/
AI Pilot Review: Key Features
✅Deploy AI expert bots in Any Niche With Just A Click
✅With one keyword, generate complete funnels, websites, landing pages, and more.
✅More than 85 AI features are included in the AI pilot.
✅No setup or configuration; use your voice (like Siri) to do whatever you want.
✅You Can Use AI Pilot To Create your version of AI Pilot And Charge People For It…
✅ZERO Manual Work With AI Pilot. Never write, Design, Or Code Again.
✅ZERO Limits On Features Or Usages
✅Use Our AI-powered Traffic To Get Hundreds Of Customers
✅No Complicated Setup: Get Up And Running In 2 Minutes
✅99.99% Up-Time Guaranteed
✅30 Days Money-Back Guarantee
✅ZERO Upfront Cost
See My Other Reviews Article:
(1) TubeTrivia AI Review: https://sumonreview.com/tubetrivia-ai-review
(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
Hand Rolled Applicative User ValidationCode KataPhilip Schwarz
Could you use a simple piece of Scala validation code (granted, a very simplistic one too!) that you can rewrite, now and again, to refresh your basic understanding of Applicative operators <*>, <*, *>?
The goal is not to write perfect code showcasing validation, but rather, to provide a small, rough-and ready exercise to reinforce your muscle-memory.
Despite its grandiose-sounding title, this deck consists of just three slides showing the Scala 3 code to be rewritten whenever the details of the operators begin to fade away.
The code is my rough and ready translation of a Haskell user-validation program found in a book called Finding Success (and Failure) in Haskell - Fall in love with applicative functors.
Enterprise Resource Planning System includes various modules that reduce any business's workload. Additionally, it organizes the workflows, which drives towards enhancing productivity. Here are a detailed explanation of the ERP modules. Going through the points will help you understand how the software is changing the work dynamics.
To know more details here: https://blogs.nyggs.com/nyggs/enterprise-resource-planning-erp-system-modules/
Graspan: A Big Data System for Big Code AnalysisAftab Hussain
We built a disk-based parallel graph system, Graspan, that uses a novel edge-pair centric computation model to compute dynamic transitive closures on very large program graphs.
We implement context-sensitive pointer/alias and dataflow analyses on Graspan. An evaluation of these analyses on large codebases such as Linux shows that their Graspan implementations scale to millions of lines of code and are much simpler than their original implementations.
These analyses were used to augment the existing checkers; these augmented checkers found 132 new NULL pointer bugs and 1308 unnecessary NULL tests in Linux 4.4.0-rc5, PostgreSQL 8.3.9, and Apache httpd 2.2.18.
- Accepted in ASPLOS ‘17, Xi’an, China.
- Featured in the tutorial, Systemized Program Analyses: A Big Data Perspective on Static Analysis Scalability, ASPLOS ‘17.
- Invited for presentation at SoCal PLS ‘16.
- Invited for poster presentation at PLDI SRC ‘16.
GraphSummit Paris - The art of the possible with Graph TechnologyNeo4j
Sudhir Hasbe, Chief Product Officer, Neo4j
Join us as we explore breakthrough innovations enabled by interconnected data and AI. Discover firsthand how organizations use relationships in data to uncover contextual insights and solve our most pressing challenges – from optimizing supply chains, detecting fraud, and improving customer experiences to accelerating drug discoveries.
Need for Speed: Removing speed bumps from your Symfony projects ⚡️Łukasz Chruściel
No one wants their application to drag like a car stuck in the slow lane! Yet it’s all too common to encounter bumpy, pothole-filled solutions that slow the speed of any application. Symfony apps are not an exception.
In this talk, I will take you for a spin around the performance racetrack. We’ll explore common pitfalls - those hidden potholes on your application that can cause unexpected slowdowns. Learn how to spot these performance bumps early, and more importantly, how to navigate around them to keep your application running at top speed.
We will focus in particular on tuning your engine at the application level, making the right adjustments to ensure that your system responds like a well-oiled, high-performance race car.
2. About us..
Rohith Sharma K S,
-Hadoop Committer, Works for Huawei
-5+ year of experience in Hadoop ecosystems
Naganarasimha G R,
-Apache Hadoop Contributor for YARN, Huawei
-4+ year of experience in Hadoop ecosystems
Sunil Govind
-Apache Hadoop Contributor for YARN and MapReduce
-3+ year of experience in Hadoop ecosystems
3. Agenda
➔Overview about general cluster deployment
➔Yarn cluster resource configurations walk through
➔Anti Patterns
◆ MapReduce
◆ YARN
● RM Restart/HA
● Queue Planning
➔Summary
4. Brief Overview: General Cluster
DeploymentA sample Hadoop Cluster Layout with HA
NM DNRM
(Master)
NN
(Master)
RM
(Backup)
NN
(Backup)
NM
NM
NM DN
DN
DN
Client
ATS RM - Resource Manager
NM - Node Manager
NN - Name Node
DN - Data Node
ATS - Application Timeline Server
ZK - ZooKeeper
ZK
ZK
ZK
ZooKeeper Cluster
5. YARN Configuration : An Example
Legacy NodeManager’s or DataNode’s were having low resource configurations. Nowadays most of the
systems has high end capability and customers wants high end machines with less number of nodes
(50~100 nodes) to achieve better performance.
Sample NodeManager configurations could be like:
-64 GB in Memory
-8/16 cores of CPU
-1Gb Network cards
-100 TB disk (or Disk Arrays)
We are now more focussing on these set of deployment and will try to cover anti-patterns OR best
usages in coming slides.
6. YARN Configuration: Related to
Resources
NodeManager:
●yarn.nodemanager.resource.memory-mb
●yarn.nodemanager.resource.cpu-vcores
●yarn.nodemanager.vmem-pmem-ratio
●yarn.nodemanager.log-dirs
●yarn.nodemanager.local-dirs
Scheduler:
●yarn.scheduler.minimum-allocation-mb
●yarn.scheduler.maximum-allocation-mb
MapReduce:
●mapreduce.map/reduce.java.opts
●mapreduce.map/reduce.memory.mb
●mapreduce.map/reduce.cpu.vcores
YARN and MR has these various resource tuning configurations to help for a better resource
allocation.
●With “vmem-pmem-ratio” (2:1 for example), Node Manager can kill container if its Virtual
Memory shoots twice to its configured memory usage.
●It’s advised to configure “local-dirs” and “log-dirs” in different mount points.
8. Container Memory Vs Container Heap
MemoryCustomer : “Enough container memory is configured, still job runs slowly and sometimes
when data is relatively more, tasks fails with OOM”
Resolution:
1.Container memory and container Heap Size both are different configurations.
2.Make sure if mapreduce.map/reduce.memory.mb is configured then configure
mapreduce.map/reduce.java.opts for heap size.
3.Since this was common mistake from users, currently in trunk we have handled this scenario. RM will
set 0.8 of container configured/requested memory as its heap memory.
1. if mapreduce.map/reduce.memory.mb values are specified, but no -Xmx is supplied for
mapreduce.map/reduce.java.opts keys, then the -Xmx value will be derived from the former's value.
2. For both these conversions, a scaling factor specified by property mapreduce.job.heap.memory-
mb.ratio is used (default 80%), to account for overheads between heap usage vs. actual physical
memory usage.
9. Shuffle phase is taking long time
Customer: “500 GB data Job finished in 4 hours, and on the cluster 1000 GB data
job is running since 12 hours in reducer phase. I think job is stuck.”
After enquiring more about resource configuration,
The same resource configurations used for both the jobs
Resolution:
1.Job is NOT hanged/stuck, rather time has spent on copying map output.
2.Increase the task resources
3.Tuning configurations
mapreduce.reduce.shuffle.parallelcopies
mapreduce.reduce.shuffle.input.buffer.percent
11. RM Restart : RMStateStore Limit
Customer: “Configured to yarn.resourcemanager.max-completed-applications to 100000.
Completed applications in cluster has reached the limit and there many applications are in
running. Observation is RM service to be up, takes 10-15 seconds”
Resolution:
1.It is NOT suggested to configure 100000 max-completed-applications.
2.Suggested to use TimelimeServer for history of YARN applications
3.Higher the value significantly impact on the RM recovery
15. Queue planning : Queue Capacity Planning for
multiple usersCustomer : “I have multiple users submitting apps to a queue, seems like all the resources have
been taken by single user’s app(s) though other apps are activated“
Queue Capacity Planning :
CS provides options to control resources used by different users under a queue. yarn.scheduler.capacity.<queue-
path>.minimum-user-limit-percent and yarn.scheduler.capacity.<queue-path>.user-limit-factor are the configurations which
determines what amount of resources each user gets
yarn.scheduler.capacity.<queue-path>.minimum-user-limit-percent defaults to 100% which implies no user limits are imposed.
This defines how much minimum resource each user is going to get.
yarn.scheduler.capacity.<queue-path>.user-limit-factor defaults to 1 which implies that a single user can never take complete
queue’s resources. Needs to be configured such that even when other users are not using the queue, how much a particular
user can take.
16. Queue planning : AM Resource Limit
Customer: “Hey buddy, most of my Jobs are in ACCEPTED state and never starts to run.
What should be the problem?”
“All my Jobs were running fine. But after RM switchover, few Jobs didn’t resume its work.
Why RM is not able to allocate new containers to these Jobs?”
Resolution:
1.User need to ensure that AM Resource Limit is properly configured w.r.t the User’s deployment needs.
Maximum resource limit for running AM containers need to be analyzed and configured correctly to
ensure effective progress of applications.
a. Refer yarn.scheduler.capacity.maximum-am-resource-percent
2.After RM switchover if few NMs were not registered back, it can result a change in cluster size
compared to what was there prior to failover. This will affect the AM Resource Limit, and hence less AMs
will be activated after restart.
3.For analytical : more AM limit, For Batch queries : less AM limit
17. Queue planning : Application Priority
within QueueCustomer : “I have many applications running in my cluster, and few are very important jobs
which has to execute fast. I now use separate queues to run some very important
applications. Configuration seems very complex here and I feel cluster resources are not
utilized well because of this.”
Resolution:
root
sales (50%) inventory(50%)
low
40%
high
20%
med
40%
low
40%
high
20%
med
40%
Configuration seems very complex for this case and
cluster resources may not be utilized very well.
Suggesting to use Application Priority instead.
18. Resolution:
Application Priority will be available in YARN from 2.8 release onwards. A brief heads-up
about this feature.
1.Configure “yarn.cluster.max-application-priority” in yarn-site.xml. This will be the maximum
priority for any user/application which can be configured.
2.Within a queue, currently applications are selected by using OrderingPolicy (FIFO/Fair). If
applications are submitted with priority, Capacity Scheduler will also consider prioirity of
application in FiFoOrderingPolicy. Hence an application with highest priority will always be
picked for resource allocation.
3.For MapReduce, use “mapreduce.job.priority” to set priority.
Application Priority within Queue
(contd..)
19. Resource Request Limits
Customer: “I am not very sure about the capacity of node managers and maximum-allocation
resource configuration. But my application is not getting any containers or its getting killed.”
Resolution/Suggestion:
NMs are not having more than 6GB memory. If container request has big memory/cpu demand which
may more than a node manager’s memory and less than default “maximum-allocation-mb”, then
container requests will not be served by RM. Unfortunately this is not thrown as an error to the user side,
and application will continuously wait for allocation. On the other hand, Scheduler will also be waiting for
some nodes to meet this heavy resource requests.
User yarn.scheduler.maximum-allocation-mb and yarn.scheduler.maximum-allocation-vcores effectively by looking up
on the NodeManager memory/cpu limit.
20. Reservation Issue
Customer : “My Application has reserved container in a node and never able to get new
containers.”
Resolution:
Reservation feature in Capacity Scheduler serves a great deal to ensure a better linear resource
allocation. However it’s possible that there can be few corner cases. For example, an application has
made a reservation to a node. But this node has various containers running (long-lived), so chances of
getting some free resources from this node is minimal in an immediate time frame.
Configurations like below can help in having some time-framed reservation for effective cluster usage.
●yarn.scheduler.capacity.reservations-continue-look-all-nodes will help in looking for a suitable resource in other
nodes too.