https://github.com/ceteri/slinky

Slinky, a high-performance web crawler / text analytics in Python, Redis, Hadoop, R, Gephi
https://github.com/ceteri/slinky

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Slinky, a high-performance web crawler / text analytics in Python, Redis, Hadoop, R, Gephi

• Host: GitHub
• URL: https://github.com/ceteri/slinky
• Owner: ceteri
• Created: 2010-08-01T00:54:35.000Z (over 14 years ago)
• Default Branch: master
• Last Pushed: 2010-08-30T20:37:56.000Z (over 14 years ago)
• Last Synced: 2024-10-26T23:39:46.303Z (about 2 months ago)
• Language: Python
• Homepage: http://ceteri.blogspot.com/
• Size: 135 KB
• Stars: 41
• Watchers: 5
• Forks: 4
• Open Issues: 0
• Metadata Files:
  • Readme: README

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README

        
## Copyright (C) 2010, Paco Nathan. This work is licensed under 

## the BSD License. To view a copy of this license, visit:

##    http://creativecommons.org/licenses/BSD/

## or send a letter to:

##    Creative Commons, 171 Second Street, Suite 300

##    San Francisco, California, 94105, USA

##

## @author Paco Nathan 

Slinky provides an open source, high-performance Web Crawler, plus

common Text Analytics, implemented in Python. 

  * uses Redis key/value store for both CrawlQueue and PageStore

  * uses SQLite to persist crawled URI content

  * uses Neo4j to persist and analyze URI metadata

  * uses Hadoop, R, Gephi for Text Analytics and Link Analytics

This leverages a "Particle Cluster" design pattern. In contrast to

MapReduce, a Particle Cluster is particularly well-suited for

combinging highly reliable servers plus low-cost/unreliable VMs. In

other words, you can take advantage of CPU + memory + I/O on availably

but relatively ephemeral resources -- which might get taken away

without notice. For example in AWS, the key/value store could run on a

large EC2 node, while the distributed tasks run on Spot Instances --

based on pricing and availability. This pattern helps maximize

throughput and reliability while minimizing the cost of scale-out for

long-running jobs.

Required installs for worker nodes:

	http://github.com/andymccurdy/redis-py

	http://www.crummy.com/software/BeautifulSoup/

	http://components.neo4j.org/neo4j.py/

	http://jpype.sourceforge.net/

	http://henry.precheur.org/python/rfc3339 (already included)

Additional required installs for server nodes:

	http://code.google.com/p/redis/downloads

	http://www.sqlite.org/download.html

	http://neo4j.org/download/

Usage:

	# initialize Redis; run on server node...

	cd PATH_TO_REDIS

	nohup ./redis-server &

	# you probably want to config so it does "BGSAVE"

	# edit "config.tsv" for your settings...

	# e.g., Slinky handles ~100 crawler threads/node, but not in default config

	# initialize CrawlQueue and PageStore; run from any node...

	./src/slinky.py redis_host:port:db flush

	./src/slinky.py redis_host:port:db config < config.tsv

	./src/slinky.py redis_host:port:db whitelist < whitelist.tsv

	./src/slinky.py redis_host:port:db seed < urls.tsv

	# perform a crawl; run this on each worker node...

	nohup ./src/slinky.py redis_host:port:db perform &

	# will poll/sleep indefinitely; use "kill -9 PID" to terminate

	# persist the crawled URI content; run from any reliable node with attached storage...

	nohup ./src/slinky.py redis_host:port:db persist &

	# will poll/sleep indefinitely; use "kill -2 PID" to close with no data loss

	# analyze the crawled URI metadata; run from any reliable node with attached storage...

	nohup ./src/slinky.py redis_host:port:db analyze &

	# will poll/sleep indefinitely; use "kill -2 PID" to close with no data loss