Docker based Hadoop provisioning - Hadoop Summit 2014

Janos Matyas / CTO / SequenceIQ Inc.

GOAL / MOTIVATION
TECHNOLOGY STACK
PROBLEM RESOLUTION / HOW IT WORKS
RESULTS / ACHIEVEMENTS
OVERVIEW

GOAL / MOTIVATION
 Ease Hadoop provisioning – everywhere
 Automate and unify the process
 Arbitrary cluster size
 Same process through a cluster lifecycle (Dev, QA, UAT, Prod)
 (Auto) scaling Hadoop
 QoS

OUR APPROACH
 Use Docker
 Build cloud-specific ‘Dockerized’ images
 Provision the cluster
 Use Ambari

DOCKER
 Lightweight, portable
 Build once, run anywhere
 VM – without the overhead of a VM
 Isolated containers
 Automated and scripted

DOCKER – CONTAINERS vs. VMs
 Containers are isolated, but share OS and,
where appropriate, bins/libraries

APACHE AMBARI – ARCHITECTURE
 Easy Hadoop cluster provisioning
 Management and monitoring
 Key features – blueprints
 REST API

APACHE AMBARI – CREATE CLUSTER
 Define a blueprint (POST /api/v1/blueprints)
 Create cluster (POST /api/v1/clusters/mycluster)

HADOOP PROVISIONG ISSUES
 Each cloud provider has a proprietary API
 Create images for each provider
 Network configuration
 Service discovery
 Resize, failover, member join support

OUR APPROACH – DETAILS
 Build your Docker image
 Install or pre-install Hadoop services with Ambari
 Install Serf and dnsmasq
 Build your cloud image
 Use Ansible to create an image

BUILD DOCKER IMAGES
 Create the Dockerfile
 Have Docker.io to build the image
 Optionally pre-install services
 Use Ambari
 Push image to Docker.io
 Licensing questions

BUILD CLOUD IMAGES
 Use a Docker ready base image
 Use Ansible to provision the image template
 Pull the Docker images
 Apply custom infrastructure
 Use cloud provider specific playbooks
 AWS EC2
 Azure

ANSIBLE
 Configuration as data
 Simplest way to automate IT
 Secure and agentless
 Goal oriented
 One playbook – multiple modules
 We use it to “burn” cloud images/templates

PROVISIONING – ISSUES
 FQDN
 /etc/hosts is read-only in Docker
 Everybody needs to know everybody
 DNS
 Single point of failure
 Dynamic cluster – nodes joining, leaving, failing
 Routing
 Cloud – ability to inter-host container routing
 Collision free private IP range for Docker bridge

PROVISIONING – SOLUTION
 FQDN
 Use –h and –dns Docker params
 DNS
 dnsmasq is running on each Docker container
 Serf member-xxx events trigger dnsmasq reconfiguration
 Routing
 Docker bridge configuration – follows a convention

SERF
 Gossip based membership
 Service discovery
 Decentralized
 Lightweight, fault tolerant
 Highly available
 DevOps friendly
 Keep an eye on Consul, Open vSwitch, pipework

SERF – DECENTRALIZED SERVICE DISCOVERY
 Gossip instead of heartbeat
 LAN, WAN profiles
 Provides membership information
 Event handlers: member_join, member_leave, member_failed, member-
update, member-reap, user
 Query

SERF – MEMBERSHIP, EVENT HANDLERS

DNSMASQ
 Network infrastructure for small networks
 Lightweight DNS, DHCP server
 Comes with most Linux distributions

AWS EC2 – HADOOP CLUSTER
 Use EC2 REST API to provision instances (from Dockerized image)
 Start Docker containers
 One Ambari server
 N-1 Ambari agents connecting to server
 Connect ambari-shell to
 Define blueprint

AWS EC2 – NETWORK SECURITY
 Create a VPC
 Configure subnets
 Routing tables
 Security gateway
 Set ACL
 Configure VPN

AWS EC2 - CLOUDFORMATION
 Manually set up VPC is too complicated
 Use CloudFormation
 Manage the stack together
 Template-based
 Environments under version control
 Customizable at runtime
 No extra charge
"VpcId" : {
"Type" : "String",
"Description" : "VpcId of your existing Virtual Private Cloud (VPC)"
},
"SubnetId" : {
"Type" : "String",
"Description" : "SubnetId of an existing subnet (for the primary
network) in your Virtual Private Cloud (VPC)"
},
"SecondaryIPAddressCount" : {
"Type" : "Number",
"Default" : "1",
"MinValue" : "1",
"MaxValue" : "5",
"Description" : "Number of secondary IP addresses to assign to the
network interface (1-5)",
"ConstraintDescription": "must be a number from 1 to 5."
},
"SSHLocation" : {
"Description" : "The IP address range that can be used to SSH to the
EC2 instances",
"Type": "String",
"MinLength": "9",
"MaxLength": "18",
"Default": "0.0.0.0/0",
"AllowedPattern": "(d{1,3}).(d{1,3}).(d{1,3}).(d{1,3})/
(d{1,2})",
"ConstraintDescription": "must be a valid IP CIDR range of the form
x.x.x.x/x."
}
},

CLOUDBREAK
Cloudbreak is a powerful left surf that
breaks over a coral reef, a mile off
southwest the island of Tavarua, Fiji.
Cloudbreak is a cloud-agnostic
Hadoop as a Service API. Abstracts
the provisioning and ease
management and monitoring of on-
demand clusters.
Provisioning Hadoop has never been easier

CLOUDBREAK
 Benefits
 Elastic
 Scalable
 Blueprints
 Flexible
 Main REST resources
 /template – specify a cluster infrastructure
 /stack – creates a cloud infrastructure built from a template
 /blueprint – describes a Hadoop cluster
 /cluster – creates a Hadoop cluster

RESULTS AND ACHIEVEMENTS
 Hadoop as a Service API
 Available for EC2 and Azure cloud
 OpenStack, bare metal is coming soon
 Open source under Apache 2 licence
 Same goals as Apache Ambari Launchpad project
 What's next?

HADOOP SERVICES - AS A SERVICE
 Leverage YARN
 Slider (Hoya) providers
 HBase, Accumulo
 SequenceIQ providers - Flume, Tomcat
 YARN -1964
 QoS for YARN – heuristic scheduler
 Platform as a Service API

BANZAI PIPELINE
Banzai Pipeline is a surf reef break located
in Hawaii, off Ehukai Beach Park in
Pupukea on O'ahu's North Shore.
Banzai Pipeline is a RESTful
application development
platform for building on-
demand data and job pipelines
running on Hadoop YARN.
Banzai Pipeline is a big data API for the REST

THANK YOU
 Get the code: https://github.com/sequenceiq
 Read about: http://blog.sequenceiq.com
 Facebook: http://facebook.com/sequenceiq
 Twitter: http://twitter.com/sequenceiq
 LinkedIn: http://linkedin.com/sequenceiq
 Contact: janos.matyas@sequenceiq.com
FEEL FREE TO CONTRIBUTE

Docker based Hadoop provisioning - Hadoop Summit 2014

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