introduction to bigcouch
play

INTRODUCTION TO BIGCOUCH robert newson couchdb conf berlin - PowerPoint PPT Presentation

Jan 02, 2024 •528 likes •781 views

INTRODUCTION TO BIGCOUCH robert newson couchdb conf berlin january 2013 1 Friday, 25 January 13 INTRODUCTIONS robert newson BigCouch CouchDB pmc member Putting the C back in CouchDB irc menace Contact rnewson@apache.org rnewson

  1. INTRODUCTION TO BIGCOUCH robert newson couchdb conf berlin january 2013 1 Friday, 25 January 13

  2. INTRODUCTIONS robert newson BigCouch CouchDB pmc member Putting the “C” back in CouchDB irc menace Contact rnewson@apache.org rnewson in #cloudant or #couchdb @rnewson 2 Friday, 25 January 13

  3. WHAT WE TALK ABOUT WHEN WE TALK ABOUT SCALING • Horizontal scaling: more servers creates more capacity • Transparent to the application: adding more capacity should not a ff ect the business logic of the application. • No single point of failure. Pseudo Scalars http://adam.heroku.com/past/2009/7/6/sql_databases_dont_scale/ 3 Friday, 25 January 13

  4. BIGCOUCH = COUCH+SCALING • Horizontal Scalability Easily add storage capacity by adding more servers Computing power (views, compaction, etc.) scales with more servers • No single point of failure (SPOF) Any node can handle any request With quorum, individual nodes can come and go • Transparent to the Application All clustering operations take place “behind the curtain” ‘looks’ like a single server instance of Couch, just with more awesome asterisks and caveats discussed later 4 Friday, 25 January 13

  5. GRAPHICAL REPRESENTATION • Clustering in a ring (a la Dynamo) PUT http://rnewson.cloudant.com/dbname/blah?w=2 • Any node can handle a request • O(1) lookup Load Balancer • Quorum system (N, R, W) • Views distributed like documents Node 1 Node 24 N o • Distributed Erlang d e A B C D 2 A B Z C • Masterless Y D hash(blah) = E X E Node 3 C D N=3 E F W=2 R=2 D Node 4 E F G 5 Friday, 25 January 13

  6. BUILDING YOUR FIRST CLUSTER • Shopping List Dependencies brew install erlang icu4c spidermonkey brew ln icu4c • Erlang (R13B03+) • ICU • Spidermonkey • LibCurl git clone https://github.com/cloudant/bigcouch.git • OpenSSL cd bigcouch ./configure • make make dev • Python 6 Friday, 25 January 13

  7. BUILDING YOUR FIRST CLUSTER rel/dev1/bin/bigcouch rel/dev2/bin/bigcouch rel/dev3/bin/bigcouch dev1 dev2 dev3 Join the cluster curl localhost:15986/nodes/dev2@127.0.0.1 -X PUT -d '{}' curl localhost:15986/nodes/dev3@127.0.0.1 -X PUT -d '{}' ... and verify curl http://localhost:15984/_membership 7 Friday, 25 January 13

  8. QUORUM: IT’S YOUR FRIEND • BigCouch Clusters are governed by 4 parameters Q: Number of shards per DB N: Number of redundant copies of each document R: Read quorum constant W: Write quorum constant (NB: Also consider the number of nodes in a cluster) 1 For the next few 5 2 examples, consider a 5 node cluster 4 3 8 Friday, 25 January 13

  9. Q • Q: The number of shards over which a DB will be spread consistent hashing space divided into Q pieces Specified at DB creation time possible for more than one shard to live on a node Documents deterministically mapped to a shard More shards = faster view builds Less shards = better memory management 1 5 2 4 3 Q=1 Q=4 9 Friday, 25 January 13

  10. N • N: The number of redundant copies of each document Choose N>1 for fault-tolerant cluster Default specified at DB creation Each shard is copied N times Recommend N>2 1 5 2 N=3 4 3 10 Friday, 25 January 13

  11. W • W: The number of document copies that must be saved before a document is “written” W must be less than or equal to N W=1, maximise throughput W=N, maximise consistency Allow for “202” created response Can be specified at write time 1 5 2 ‘201 ok’ 4 3 W=2 11 Friday, 25 January 13

  12. R • R: The number of identical document copies that must be read before a read request is ok R must be less than or equal to N R=1, minimise latency R=N, maximise consistency Can be specified at query time 1 5 2 4 3 R=2 12 Friday, 25 January 13

  13. Views • So far, so good, but what about secondary indexes? Views are built locally on each node, for each DB shard Merge sort at query time using exactly one copy of each shard Run a final re-reduce on each row if the view has a reduce • _changes feed works similarly, but has no global ordering 1 Sequence numbers converted to JSON to encode more information 5 2 4 3 14 13 Friday, 25 January 13

  14. API AND CAVEATS • Clustered API By default listens on port 5984 All single-doc operations and most view operations • What’s Di ff erent? update_seq value is now opaque JSON rereduce=true always called on reduce views no temporary views no all_or_nothing: true • ‘Backdoor’ Access Able to reach a single node (i.e. at the shard level) By default listens on port 5986 Allows you to trigger local view updates, compactions, etc. 14 Friday, 25 January 13

  15. Hacker Portion The BigCouch Stack CHTTPD Fabric Rexi Mem3 Embedded CouchDB Mochiweb, Spidermonkey, etc. 15 Friday, 25 January 13

  16. chttpd / fabric • Chttpd Cut-n-paste of couch_httpd, but using fabric for all data access • Fabric OTP library application (no processes) responsible for clustered versions of CouchDB core API calls CHTTPD Quorum logic, view merging, etc. Provides a clean Erlang interface to Fabric BigCouch Rexi Mem3 Embedded CouchDB Mochiweb, Spidermonkey, etc. 16 Friday, 25 January 13

  17. Mem3 • Maintains the shard mapping for each clustered database in a node-local CouchDB database • Changes in the node registration and shard mapping databases are automatically replicated to all cluster nodes CHTTPD Fabric Rexi Mem3 Embedded CouchDB Mochiweb, Spidermonkey, etc. 17 Friday, 25 January 13

  18. Rexi • BigCouch makes a large number of parallel RPCs • Erlang RPC library not designed for heavy parallelism promiscuous spawning of processes responses directed back through single process on remote node requests block until remote ‘rex’ process is monitored • Rexi removes some of the safeguards CHTTPD in exchange for lower latencies no middlemen on the local node Fabric remote process responds directly to client remote process monitoring occurs out-of-band Rexi Mem3 Embedded CouchDB Mochiweb, Spidermonkey, etc. 18 Friday, 25 January 13

  19. FUTURE 19 Friday, 25 January 13

  20. BIGCOUCH HAS NO FUTURE 20 Friday, 25 January 13

  21. THE FUTURE IS COUCHDB 21 Friday, 25 January 13

  22. WE’RE MERGING 22 Friday, 25 January 13

  23. THE MERGE • Release BigCouch 0.5.0 • Release Apache CouchDB 1.3.0 • Merge them • Release Apache CouchDB 2.0.0 (couchdb strikes back) 23 Friday, 25 January 13

  24. SUMMARY • BigCouch: putting the ‘C’ back in CouchDB • Consistent hashing for database sharding (a la Dynamo) • True horizontal scalability with CouchDB • Download now and get started https://github.com/cloudant/bigcouch.git 24 Friday, 25 January 13

Recommend

INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION

INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION

TRAINING COURSE ON SOCIAL PROTECTION & FORMALIZATION TRINIDAD AND TOBAGO MARCH 15, 2017 INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION INTRODUCTION Design of the NIS Assistance from the

547 views • 23 slides
INTRODUCTION Introduction 2/42 INTRODUCTION Alternations I am giving bread to the

INTRODUCTION Introduction 2/42 INTRODUCTION Alternations I am giving bread to the

Patterns of variation in the expression of case and agreement Andrs Brny Leiden University Centre for Linguistics 9 November 2019, BaSIS Workshop a.barany@hum.leidenuniv.nl INTRODUCTION Introduction 2/42 INTRODUCTION

1.37k views • 42 slides
Introduction Introduction Introduction Introduction Outline Motivation Failures

Introduction Introduction Introduction Introduction Outline Motivation Failures

Introduction Introduction Introduction Introduction Outline Motivation Failures Definition and concepts Process and product properties Principles SE Approaches Motivation Software and the economy The economies of

1.03k views • 49 slides
Introduction Introduction Introduction Nationwide Cause for Concern 1

Introduction Introduction Introduction Nationwide Cause for Concern 1

Introduction Introduction Introduction Nationwide Cause for Concern 1 https://www.cdc.gov/std/stats17/infographic.htm Introduction Epidemiology in Western Colorado CPHE Surveillance Data Report, May 2018 Chlamydia Epidemiology in Western

977 views • 39 slides
DAQ introduction Purpose of this talk : (1) Introduction for those who have not been in every

DAQ introduction Purpose of this talk : (1) Introduction for those who have not been in every

DAQ introduction Purpose of this talk : (1) Introduction for those who have not been in every meeting (2) Some ideas of diagrams for section 7.1 (Introduction) of TP. Giles Barr 25 Jan 2018, Pembroke College On DUNE, the reality is there is a

474 views • 10 slides
INTRODUCTION cf. Schneider, Chapter 1 INTRODUCTION THEY ARE OUT TO GET YOU INTRODUCTION WHAT

INTRODUCTION cf. Schneider, Chapter 1 INTRODUCTION THEY ARE OUT TO GET YOU INTRODUCTION WHAT

ADVANCED COMPUTER SECURITY INTRODUCTION cf. Schneider, Chapter 1 INTRODUCTION THEY ARE OUT TO GET YOU INTRODUCTION WHAT IS SECURITY? A systems security policies describe What the system is supposed to do Store and provide access

479 views • 16 slides
Overview Introduction to SMIL Introduction to W3C and XML Introduction to SMIL

Overview Introduction to SMIL Introduction to W3C and XML Introduction to SMIL

Overview Introduction to SMIL Introduction to W3C and XML Introduction to SMIL Writing a SMIL file Adding Media Objects Martin Halvey Clipping media files January 2008 Timing and Synchronising Layout World Wide

387 views • 14 slides
14 Introduction Introduction Bad guys can put malware into Example: hosts

14 Introduction Introduction Bad guys can put malware into Example: hosts

Introduction Introduction source Encapsulation ISO/OSI reference model message M application segment H t H t M transport network datagram H n H n H t M presentation: allow applications to frame link H l H n H t M interpret

583 views • 4 slides
Previous Lecture Introduction to SMIL 2 Introduction to W3C and XML Introduction to SMIL

Previous Lecture Introduction to SMIL 2 Introduction to W3C and XML Introduction to SMIL

Previous Lecture Introduction to SMIL 2 Introduction to W3C and XML Introduction to SMIL Writing a SMIL file Adding Media Objects Martin Halvey Clipping media files January 2008 Timing and Synchronising Layout

322 views • 8 slides
Lecture 1 Andreas Habegger Introduction Zynq Introduction Zynq Introduction Zynq PS vs. PL

Lecture 1 Andreas Habegger Introduction Zynq Introduction Zynq Introduction Zynq PS vs. PL

Introduction Zynq Lecture 1 Andreas Habegger Introduction Zynq Introduction Zynq Introduction Zynq PS vs. PL Processing System Processor Peripherals Data Buses AXI Bus Conclusion BTE5380 - Embedded Systems Octobre 2014 Andreas Habegger

1.81k views • 30 slides
2018.06 01 SMILE5 Introduction S E 5 02 Alpha Cloud M I L 03 Company Introduction 04

2018.06 01 SMILE5 Introduction S E 5 02 Alpha Cloud M I L 03 Company Introduction 04

2018.06 01 SMILE5 Introduction S E 5 02 Alpha Cloud M I L 03 Company Introduction 04 Project References S E 5 PART.1 SMILE5 Introduction M I L Introduction STORION-SMILE5 Residential Energy Storage System Inverter 5kW Output Input

1.06k views • 25 slides
Introduction to CICS Course introduction Course introduction What is CICS? What is an

Introduction to CICS Course introduction Course introduction What is CICS? What is an

Introduction to CICS Course introduction Course introduction What is CICS? What is an application server? Why use an application server? Course introduction Services provided by CICS How CICS applications are defined Scaling CICS to meet

1.84k views • 146 slides
Network Visualization Introduction Presented by Shahed Introduction Introduction Basic

Network Visualization Introduction Presented by Shahed Introduction Introduction Basic

Network Visualization Introduction Presented by Shahed Introduction Introduction Basic building blocks Node Links (relationship between nodes) Spatial information Network data

584 views • 9 slides
Introduction Introduction (1) Main argument of the paper: universities are not only

Introduction Introduction (1) Main argument of the paper: universities are not only

Le jugement des pairs comme outil de management des universits Peer-review as a management tool Christine Musselin (CSO, Sciences Po et CNRS) Avril 2013, Lirrsistible ascension du capitalisme acadmique Introduction Introduction (1)

590 views • 28 slides
JABLOTRON JA-100 introduction November 2011 Introduction Todays goals First introduction of

JABLOTRON JA-100 introduction November 2011 Introduction Todays goals First introduction of

JABLOTRON JA-100 introduction November 2011 Introduction Todays goals First introduction of the brand new JA-100 alarm system Visions Basic architecture System components Setting Help us with final validations You are the FIRST ones

1.69k views • 111 slides
Introduction Introduction to storage and to storage and filesystems filesystems Introduction

Introduction Introduction to storage and to storage and filesystems filesystems Introduction

Moreno Baricevic Gilberto Daz Axel Kohlmeyer Stefano Cozzini ULA ICTP CNR-IOM DEMOCRITOS Merida, VENEZUELA Trieste, ITALY Trieste, ITALY Introduction Introduction to storage and to storage and filesystems filesystems Introduction

1.19k views • 51 slides
1 Introduction Introduction Communication System Baseband an adjective that describes

1 Introduction Introduction Communication System Baseband an adjective that describes

Introduction Introduction Physical Layer Mobile network Global ISP Provides the means to transmit bits Basic Concepts of from sender to receiver, Data Transmission Defines the mechanical, electrical, and Home network timing

463 views • 7 slides
Welcome! Todays Agenda: Topic Introduction Course Introduction Team Practical

Welcome! Todays Agenda: Topic Introduction Course Introduction Team Practical

INFOGR Computer Graphics Jacco Bikker - April-July 2015 - Lecture 1: Introduction Welcome! Todays Agenda: Topic Introduction Course Introduction Team Practical Details Assignments Field Study State of

869 views • 62 slides
Introduction (00) RNDr. Martin Madaras, PhD. madaras@skeletex.xyz Introduction Introduction

Introduction (00) RNDr. Martin Madaras, PhD. madaras@skeletex.xyz Introduction Introduction

Virtual and Augmented Reality Introduction (00) RNDr. Martin Madaras, PhD. madaras@skeletex.xyz Introduction Introduction Who am I? What do I do here? 2 About me Short research bio: - 2014 - finished PhD at FMFI UK - 2014 2016 -

1.3k views • 39 slides
PRESENTATION The Introduction What is the Introduction ? The introduction prepares the audience

PRESENTATION The Introduction What is the Introduction ? The introduction prepares the audience

PRESENTATION The Introduction What is the Introduction ? The introduction prepares the audience for your presentation. It tells them what your presentation is about, why it is important, and finally, what to listen for in your speech. Get the

505 views • 3 slides
How to make a presentation with L A T EX? Introduction to L A T EX Introduction to Beamer

How to make a presentation with L A T EX? Introduction to L A T EX Introduction to Beamer

Introduction to Beamer Hafida Benhidour How to make a presentation with L A T EX? Introduction to L A T EX Introduction to Beamer Introduction to Beamer Hafida Benhidour Department of computer science King Saud University November

732 views • 49 slides
Shenzhen Cuilu jewelry Co., Ltd was founded in 1996 and its a large private enterprise

Shenzhen Cuilu jewelry Co., Ltd was founded in 1996 and its a large private enterprise

Introduction Introduction - - Brief Brief Introduction Introduction of of Cuilu Cuilu Group Group Introduction Introduction - - Brief Brief Introduction Introduction of of Cuilu Cuilu Group Group Shenzhen Cuilu jewelry Co., Ltd

147 views • 14 slides
Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org

Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org

V olunteer C ommunications N etwork (V-C-N.org) Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org Academy Course - 2012-02.24-2208 262: Introduction to ICS-214 : V-C-N.org : Slide: 1 V olunteer C

558 views • 18 slides
Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org

Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org

V olunteer C ommunications N etwork (V-C-N.org) Introduction to ICS- -214 214 Introduction to ICS Official Unit / Incident Log - A V-C-N.org Academy Course - 2012-02.24-2208 262: Introduction to ICS-214 : V-C-N.org : Slide: 1 V olunteer C

735 views • 34 slides

More recommend