samuraisam’s gists

samuraisam / do_once_decorator.py

Created June 13, 2012 00:24

A decorator that allows you to execute a function exactly once upon the first execution of the wrapped function

	import uuid
	import functools

	def do_once(once_f, once_f_a, *once_f_kw):
	"""
	A decorator that executes `once_f(once_f_a, *once_f_kw)` exactly once upon
	the first execution of the decorated function. `once_f` may be a string in
	which case it will be used to getattr() from the class.

	`once_f` may be any callable. If the wrapped function is a classmethod

samuraisam / example.clj

Created July 5, 2012 03:05

Signs objects (strings or whatever) into url-safe strings that can be used as CSRF tokens or whatnot

	(ns myns [:use lazy.utils.signing :as signing])

	(signing/with-keypair-filename "private.pem"
	(signing/dumps {:my "hash" :of "any size"}))

samuraisam / helloselect.go

Created July 29, 2012 00:20

trying out the select functionality of go

	/*
	* Intent - in paralell, download a series of urls
	* - timeout after 1 sec if the download has not completed
	* - allow for failures, and move on (similar to timeout)
	* - collect the stringified response from the fetched url
	*/

	package main

	import (

samuraisam / gist:3212973

Created July 31, 2012 02:34

	vagrant@precise64:~$ cat /tmp/vagrant-chef-1/chef-stacktrace.out
	Generated at Tue Jul 31 02:26:40 +0000 2012
	NoMethodError: undefined method `[]' for nil:NilClass
	/tmp/vagrant-chef-1/chef-solo-1/cookbooks/nginx/recipes/ohai_plugin.rb:22:in `from_file'
	/opt/vagrant_ruby/lib/ruby/gems/1.8/gems/chef-0.10.10/bin/../lib/chef/cookbook_version.rb:578:in `load_recipe'
	/opt/vagrant_ruby/lib/ruby/gems/1.8/gems/chef-0.10.10/bin/../lib/chef/mixin/language_include_recipe.rb:46:in `load_recipe'
	/opt/vagrant_ruby/lib/ruby/gems/1.8/gems/chef-0.10.10/bin/../lib/chef/mixin/language_include_recipe.rb:33:in `include_recipe'
	/opt/vagrant_ruby/lib/ruby/gems/1.8/gems/chef-0.10.10/bin/../lib/chef/mixin/language_include_recipe.rb:27:in `each'
	/opt/vagrant_ruby/lib/ruby/gems/1.8/gems/chef-0.10.10/bin/../lib/chef/mixin/language_include_recipe.rb:27:in `include_recipe'
	/tmp/vagrant-chef-1/chef-solo-1/cookbooks/nginx/recipes/default.rb:21:in `from_file'

samuraisam / gist:3220248

Created July 31, 2012 20:34

	live migrating a 3-node cluster (RF=2) to a new 3-node cluster (RF=2)

	NOTE! If you are starting a cluster using the DSC AMI - wipe the data directories of all the nodes and restart them before starting this process.

	1. configure the first node of the new cluster to tok=170141183460469231731687303715884105728, autobootstrap=yes; start it
	2. wait 2 mins
	3. configure the 2nd and 3rd nodes of the new cluster to tok=$oldClusterNode[N].Tok - 1, autobootstrap=yes, waiting 2 mins between each
	4. point clients at the new cluster nodes
	5. decommission the old cluster nodes, 1 at a time, starting with the first node
	6. move node 1 token from 170141183460469231731687303715884105728 to 0

samuraisam / after restart

Created July 31, 2012 22:04

	OLD CLUSTER AFTER RESTART OF 0:

	Address DC Rack Status State Load Owns Token
	98762195403485621985010037012424498538
	10.4.62.215 datacenter1 rack1 Up Normal 1.54 GB 41.95% 0
	10.72.226.33 datacenter1 rack1 Up Normal 1.66 GB 33.33% 56703851999289891297969860682700010126
	10.254.183.47 datacenter1 rack1 Up Normal 1.15 GB 24.72% 98762195403485621985010037012424498538

samuraisam / gist:3221245

Created July 31, 2012 22:30

	nodetool ring from node 1 of the new cluster:

	Address DC Rack Status State Load Owns Token
	170141183460469231731687303715884105728
	10.4.62.215 UNKNOWN-DC UNKNOWN-RACKUp Normal 1.54 GB 0.00% 0
	10.72.226.33 UNKNOWN-DC UNKNOWN-RACKUp Normal 1.66 GB 33.33% 56703851999289891297969860682700010126
	10.254.183.47 UNKNOWN-DC UNKNOWN-RACKUp Normal 1.15 GB 24.72% 98762195403485621985010037012424498538
	10.4.58.173 us-east 1c Up Normal 11.12 KB 41.95% 170141183460469231731687303715884105728

samuraisam / gist:3221761

Created July 31, 2012 23:45

	Address DC Rack Status State Load Effective-Ownership Token
	170141183460469231731687303715884105728
	10.4.62.215 datacenter1 rack1 Up Normal 1.54 GB 41.95% 0
	10.72.226.33 datacenter1 rack1 Up Normal 1.66 GB 33.33% 56703851999289891297969860682700010126
	10.254.183.47 datacenter1 rack1 Up Normal 1.15 GB 58.05% 98762195403485621985010037012424498538
	10.4.58.173 datacenter1 rack1 Down Normal 11.12 KB 66.67% 170141183460469231731687303715884105728

samuraisam / gist:3221813

Created July 31, 2012 23:52

	Address DC Rack Status State Load Effective-Ownership Token
	98762195403485621985010037012424498538
	10.4.62.215 datacenter1 rack1 Up Normal 2.06 GB 66.67% 0
	10.72.226.33 datacenter1 rack1 Up Normal 1.66 GB 75.28% 56703851999289891297969860682700010126
	10.254.183.47 datacenter1 rack1 Up Normal 1.18 GB 58.05% 98762195403485621985010037012424498538

samuraisam / gist:3222107

Created August 1, 2012 00:48

	INFO [main] 2012-08-01 00:47:39,578 AbstractCassandraDaemon.java (line 121) JVM vendor/version: Java HotSpot(TM) Client VM/1.6.0_26
	INFO [main] 2012-08-01 00:47:39,582 AbstractCassandraDaemon.java (line 122) Heap size: 862978048/864026624
	INFO [main] 2012-08-01 00:47:39,583 AbstractCassandraDaemon.java (line 123) Classpath: /usr/share/cassandra/lib/antlr-3.2.jar:/usr/share/cassandra/lib/avro-1.4.0-fixes.jar:/usr/share/cassandra/lib/avro-1.4.0-sources-fixes.jar:/usr/share/cassandra/lib/commons-cli-1.1.jar:/usr/share/cassandra/lib/commons-codec-1.2.jar:/usr/share/cassandra/lib/commons-lang-2.4.jar:/usr/share/cassandra/lib/compress-lzf-0.8.4.jar:/usr/share/cassandra/lib/concurrentlinkedhashmap-lru-1.3.jar:/usr/share/cassandra/lib/guava-r08.jar:/usr/share/cassandra/lib/high-scale-lib-1.1.2.jar:/usr/share/cassandra/lib/jackson-core-asl-1.9.2.jar:/usr/share/cassandra/lib/jackson-mapper-asl-1.9.2.jar:/usr/share/cassandra/lib/jamm-0.2.5.jar:/usr/share/cassandra/lib/jline-0.9.94.jar:/usr/share/cassandra/lib/json-si

Samuel Sutch samuraisam