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Merge pull request #5602 from mattf/spark-example

Spark example
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# Spark example
Following this example, you will create a functional [Apache
Spark](http://spark.apache.org/) cluster using Kubernetes and
[Docker](http://docker.io).
You will setup a Spark master service and a set of
Spark workers using Spark's [standalone mode](http://spark.apache.org/docs/latest/spark-standalone.html).
For the impatient expert, jump straight to the [tl;dr](#tldr)
section.
### Sources
Source is freely available at:
* Docker image - https://github.com/mattf/docker-spark
* Docker Trusted Build - https://registry.hub.docker.com/search?q=mattf/spark
## Step Zero: Prerequisites
This example assumes you have a Kubernetes cluster installed and
running, and that you have installed the ```kubectl``` command line
tool somewhere in your path. Please see the [getting
started](../../docs/getting-started-guides) for installation
instructions for your platform.
## Step One: Start your Master service
The Master service is the master (or head) service for a Spark
cluster.
Use the `examples/spark/spark-master.json` file to create a pod running
the Master service.
```shell
$ kubectl create -f examples/spark/spark-master.json
```
Then, use the `examples/spark/spark-master-service.json` file to
create a logical service endpoint that Spark workers can use to access
the Master pod.
```shell
$ kubectl create -f examples/spark/spark-master-service.json
```
Ensure that the Master service is running and functional.
### Check to see if Master is running and accessible
```shell
$ kubectl get pods,services
POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS
spark-master 192.168.90.14 spark-master mattf/spark-master 172.18.145.8/172.18.145.8 name=spark-master Running
NAME LABELS SELECTOR IP PORT
kubernetes component=apiserver,provider=kubernetes <none> 10.254.0.2 443
kubernetes-ro component=apiserver,provider=kubernetes <none> 10.254.0.1 80
spark-master name=spark-master name=spark-master 10.254.125.166 7077
```
Connect to http://192.168.90.14:8080 to see the status of the master.
```shell
$ links -dump 192.168.90.14:8080
[IMG] 1.2.1 Spark Master at spark://spark-master:7077
* URL: spark://spark-master:7077
* Workers: 0
* Cores: 0 Total, 0 Used
* Memory: 0.0 B Total, 0.0 B Used
* Applications: 0 Running, 0 Completed
* Drivers: 0 Running, 0 Completed
* Status: ALIVE
...
```
(Pull requests welcome for an alternative that uses the service IP and
port)
## Step Two: Start your Spark workers
The Spark workers do the heavy lifting in a Spark cluster. They
provide execution resources and data cache capabilities for your
program.
The Spark workers need the Master service to be running.
Use the `examples/spark/spark-worker-controller.json` file to create a
ReplicationController that manages the worker pods.
```shell
$ kubectl create -f examples/spark/spark-worker-controller.json
```
### Check to see if the workers are running
```shell
$ links -dump 192.168.90.14:8080
[IMG] 1.2.1 Spark Master at spark://spark-master:7077
* URL: spark://spark-master:7077
* Workers: 3
* Cores: 12 Total, 0 Used
* Memory: 20.4 GB Total, 0.0 B Used
* Applications: 0 Running, 0 Completed
* Drivers: 0 Running, 0 Completed
* Status: ALIVE
Workers
Id Address State Cores Memory
4 (0 6.8 GB
worker-20150318151745-192.168.75.14-46422 192.168.75.14:46422 ALIVE Used) (0.0 B
Used)
4 (0 6.8 GB
worker-20150318151746-192.168.35.17-53654 192.168.35.17:53654 ALIVE Used) (0.0 B
Used)
4 (0 6.8 GB
worker-20150318151746-192.168.90.17-50490 192.168.90.17:50490 ALIVE Used) (0.0 B
Used)
...
```
(Pull requests welcome for an alternative that uses the service IP and
port)
## Step Three: Do something with the cluster
```shell
$ kubectl get pods,services
POD IP CONTAINER(S) IMAGE(S) HOST LABELS STATUS
spark-master 192.168.90.14 spark-master mattf/spark-master 172.18.145.8/172.18.145.8 name=spark-master Running
spark-worker-controller-51wgg 192.168.75.14 spark-worker mattf/spark-worker 172.18.145.9/172.18.145.9 name=spark-worker,uses=spark-master Running
spark-worker-controller-5v48c 192.168.90.17 spark-worker mattf/spark-worker 172.18.145.8/172.18.145.8 name=spark-worker,uses=spark-master Running
spark-worker-controller-ehq23 192.168.35.17 spark-worker mattf/spark-worker 172.18.145.12/172.18.145.12 name=spark-worker,uses=spark-master Running
NAME LABELS SELECTOR IP PORT
kubernetes component=apiserver,provider=kubernetes <none> 10.254.0.2 443
kubernetes-ro component=apiserver,provider=kubernetes <none> 10.254.0.1 80
spark-master name=spark-master name=spark-master 10.254.125.166 7077
$ sudo docker run -it mattf/spark-base sh
sh-4.2# echo "10.254.125.166 spark-master" >> /etc/hosts
sh-4.2# export SPARK_LOCAL_HOSTNAME=$(hostname -i)
sh-4.2# MASTER=spark://spark-master:7077 pyspark
Python 2.7.5 (default, Jun 17 2014, 18:11:42)
[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Welcome to
____ __
/ __/__ ___ _____/ /__
_\ \/ _ \/ _ `/ __/ '_/
/__ / .__/\_,_/_/ /_/\_\ version 1.2.1
/_/
Using Python version 2.7.5 (default, Jun 17 2014 18:11:42)
SparkContext available as sc.
>>> import socket, resource
>>> sc.parallelize(range(1000)).map(lambda x: (socket.gethostname(), resource.getrlimit(resource.RLIMIT_NOFILE))).distinct().collect()
[('spark-worker-controller-ehq23', (1048576, 1048576)), ('spark-worker-controller-5v48c', (1048576, 1048576)), ('spark-worker-controller-51wgg', (1048576, 1048576))]
```
## tl;dr
```kubectl create -f spark-master.json```
```kubectl create -f spark-master-service.json```
Make sure the Master Pod is running (use: ```kubectl get pods```).
```kubectl create -f spark-worker-controller.json```
examples/spark/spark-master-service.json 0 → 100644
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{
"id": "spark-master",
"kind": "Service",
"apiVersion": "v1beta1",
"port": 7077,
"containerPort": 7077,
"selector": { "name": "spark-master" },
"labels": { "name": "spark-master" }
}
examples/spark/spark-master.json 0 → 100644
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{
"id": "spark-master",
"kind": "Pod",
"apiVersion": "v1beta1",
"desiredState": {
"manifest": {
"version": "v1beta1",
"id": "spark-master",
"containers": [{
"name": "spark-master",
"image": "mattf/spark-master",
"cpu": 100,
"ports": [{ "containerPort": 7077 }]
}]
}
},
"labels": {
"name": "spark-master"
}
}
examples/spark/spark-worker-controller.json 0 → 100644
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{
"id": "spark-worker-controller",
"kind": "ReplicationController",
"apiVersion": "v1beta1",
"desiredState": {
"replicas": 3,
"replicaSelector": {"name": "spark-worker"},
"podTemplate": {
"desiredState": {
"manifest": {
"version": "v1beta1",
"id": "spark-worker-controller",
"containers": [{
"name": "spark-worker",
"image": "mattf/spark-worker",
"cpu": 100,
"ports": [{"containerPort": 8888, "hostPort": 8888}]
}]
}
},
"labels": {
"name": "spark-worker",
"uses": "spark-master"
}
}
},
"labels": {"name": "spark-worker"}
}
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