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https://github.com/mesosphere/RENDLER
A rendering web crawler for Apache Mesos.
https://github.com/mesosphere/RENDLER
dcos dcos-orchestration-guild
Last synced: 3 months ago
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A rendering web crawler for Apache Mesos.
- Host: GitHub
- URL: https://github.com/mesosphere/RENDLER
- Owner: mesosphere
- Archived: true
- Created: 2014-05-11T23:32:16.000Z (about 10 years ago)
- Default Branch: master
- Last Pushed: 2019-08-19T18:56:55.000Z (almost 5 years ago)
- Last Synced: 2024-01-18T18:29:22.077Z (5 months ago)
- Topics: dcos, dcos-orchestration-guild
- Language: Python
- Size: 2.41 MB
- Stars: 246
- Watchers: 180
- Forks: 77
- Open Issues: 15
-
Metadata Files:
- Readme: README.md
Lists
- awesome-mesos - RENDLER
- my-awesome-stars - mesosphere/RENDLER - A rendering web crawler for Apache Mesos. (Python)
README
RENDLER :interrobang:
=====================
A rendering web-crawler framework for [Apache Mesos](http://mesos.apache.org/).
See the [accompanying slides](http://mesosphere.github.io/oscon-mesos-2014/#/) for more context.
RENDLER consists of three main components:
- `CrawlExecutor` extends `mesos.Executor`
- `RenderExecutor` extends `mesos.Executor`
- `RenderingCrawler` extends `mesos.Scheduler` and launches tasks with the executors
## Quick Start with Vagrant
### Requirements
- [VirtualBox](http://www.virtualbox.org/) 4.1.18+
- [Vagrant](http://www.vagrantup.com/) 1.3+
- [git](http://git-scm.com/downloads) (command line tool)
### Start the `mesos-demo` VM
```bash
$ wget http://downloads.mesosphere.io/demo/mesos.box -O /tmp/mesos.box
$ vagrant box add --name mesos-demo /tmp/mesos.box
$ git clone https://github.com/mesosphere/RENDLER.git
$ cd RENDLER
$ vagrant up
```
Now that the VM is running, you can view the Mesos Web UI here:
[http://10.141.141.10:5050](http://10.141.141.10:5050)
You can see that 1 slave is registered and you've got some idle CPUs and Memory. So let's start the Rendler!
### Run RENDLER in the `mesos-demo` VM
Check implementations of the RENDLER scheduler in the `python`, `go`,
`scala`, and `cpp` directories. Run instructions are here:
- [Python RENDLER framework](python/README.md)
- [Go RENDLER framework](go/README.md)
- [Scala RENDLER framework](scala/README.md)
- [C++ RENDLER framework](cpp/README.md)
Feel free to contribute your own!
### Generating a pdf of your render graph output
With [GraphViz](http://www.graphviz.org) (`which dot`) installed:
```bash
vagrant@mesos:hostfiles $ bin/make-pdf
Generating '/home/vagrant/hostfiles/result.pdf'
```
Open `result.pdf` in your favorite viewer to see the rendered result!
**Sample Output**
### Shutting down the `mesos-demo` VM
```bash
# Exit out of the VM
vagrant@mesos:hostfiles $ exit
# Stop the VM
$ vagrant halt
# To delete all traces of the vagrant machine
$ vagrant destroy
```
## Rendler Architecture
### Crawl Executor
- Interprets incoming tasks' `task.data` field as a URL
- Fetches the resource, extracts links from the document
- Sends a framework message to the scheduler containing the crawl result.
### Render Executor
- Interprets incoming tasks' `task.data` field as a URL
- Fetches the resource, saves a png image to a location accessible to the scheduler.
- Sends a framework message to the scheduler containing the render result.
### Intermediate Data Structures
We define some common data types to facilitate communication between the scheduler
and the executors. Their default representation is JSON.
```python
results.CrawlResult(
"1234", # taskId
"http://foo.co", # url
["http://foo.co/a", "http://foo.co/b"] # links
)
```
```python
results.RenderResult(
"1234", # taskId
"http://foo.co", # url
"http://dl.mega.corp/foo.png" # imageUrl
)
```
### Rendler Scheduler
#### Data Structures
- `crawlQueue`: list of urls
- `renderQueue`: list of urls
- `processedURLs`: set or urls
- `crawlResults`: list of url tuples
- `renderResults`: map of urls to imageUrls
#### Scheduler Behavior
The scheduler accepts one URL as a command-line parameter to seed the render
and crawl queues.
1. For each URL, create a task in both the render queue and the crawl queue.
1. Upon receipt of a crawl result, add an element to the crawl results
adjacency list. Append to the render and crawl queues each URL that is
_not_ present in the set of processed URLs. Add these enqueued urls to
the set of processed URLs.
1. Upon receipt of a render result, add an element to the render results map.
1. The crawl and render queues are drained in FCFS order at a rate determined
by the resource offer stream. When the queues are empty, the scheduler
declines resource offers to make them available to other frameworks running
on the cluster.