Let's Run Some Numbers
Given the MTTF of a server, how much hardware and how quickly must the cluster failover to a new master and still meet our SLAs requirements vs a Dynamo based system?
Let's start with some assumptions:
We want to achieve 4000 transactions/sec with 3 node replication factor. Our load mix is 75% reads/25% writes.
We want to have some consistency, so that we don't read newer values, then older values, so for Dynamo:
R = 2, W = 2, N = 3
- High Scalability: The State of NoSQL in 2012
- ZURB: Start Here, Build Everywhere: Announcing Foundation
- paperplanes: A Tour of Amazon's DynamoDB
- New Relic: Why I Love Working at New Relic: Chris Kelly, Developer/Evangelist
- How Software is Built: Interview with Eliot Horowitz - CTO of 10gen / MongoDB
- Opscode Blog: Announcing Commercial Support for Open Source Chef
* Run your app in a simulator, emulator or mobile device and you'll start seeing data in just a few minutes
While you're at it check out the latest version of New Relic for iPhone , because now you can monitor your mobile apps from our mobile app. We meant it when we said we've gone completely mobile.
The post A Developer's Best Friend - Now for Mobile Apps appeared first on New Relic blog .
- Ruby Inside: New Relic RPM Officially Supports Rack and Sinatra - Finally!
- Lindsay Holmwood - auxesis' musings: Instrumenting your monitoring checks with New Relic
- Heroku: Better Queuing Metrics With Updated New Relic Add-On
- Opscode Blog: Opscamp San Francisco
- Rails Inside: Seed: A New Rails Powered Open Source CMS With In-Page Admin Interface
- Engine Yard Developer Blog: Rails Roadshow Coming Home!
- Run an ANALYZE TABLE on a table accessed by the long running query
So first we need a long running query against table t: SELECT * FROM t WHERE c > '%c%';
Then in our efforts to get a better execution plan for another query we run ANALYZE TABLE: mysql> analyze table t; +--------+---------+----------+----------+ | Table | Op | Msg_type | Msg_text | +--------+---------+----------+----------+ | test.t | analyze | status | OK | +--------+---------+----------+----------+ …
- On the Path: Tuning MySQL
- Junior developer: Rails test data not getting rolled back
- Signal vs. Noise: Nuts & Bolts: Database Servers
- High Scalability: Facebook at 13 Million Queries Per Second Recommends: Minimize Request Variance
- Axon Flux // A Ruby on Rails Blog: Impressive tech talk on Scaling MySQL at Facebook
- JJinuxLand: MySQL: Disk Usage Can Never Shrink When Using InnoDB
Run CentOS 5
Have UTF-8 data in MySQL
Use Perl to access that data
Have not upgraded DBD::mysql (perl-DBD-MySQL)
then your UTF-8 data is in peril with Perl. The solution is simple: upgrade to any newer version of DBD::mysql ( except 4.014 ).
The post CentOS 5 users: your UTF-8 data is in peril with Perl appeared first on MySQL Performance Blog .
- elc technologies - Blog : Ruby on Rails, iPhone, Flash, Agile, Interactive Design: Exporting MySQL database
- gnuu.org: Ruby 1.9 Encoding Issues, Again.
- Matthew Bass: Processing malformed files with FasterCSV
- Transcending Frontiers: Simple Database Export and Import With Character Encoding Conversion
- pingles: Clojure - From Callbacks to Sequences
- Lance: Unit Testing Spring Security with Annotations
With the Sidekiq Monitor Plugin (by Scott Klein of StatusPage.io ) and the Puppet Last Run Plugin (by Didip Kerabat of Kongregrate ) Scout's plugin directory count has now passed 70 plugins!
The Sidekiq Monitor Plugin monitors key metrics for Sidekiq , a Ruby message processing library. Didip's Puppet Last Run Plugin tracks key metrics for the most recent Puppet run on a monitored server.
- Ruby Inside: The Mega Ruby News and Release Roundup for February 2012
- A Fresh Cup: Double Shot #812
- New Relic: Why New Relic Is Raising $80 Million Now
- Mike Perham: Sidekiq - simple, efficient messaging for Rails
CHEF-3589 - Why Run code runs code in {{converge_by}} blocks after the provider action is complete
CHEF-3604 - Chef::Provider:: Service:: Init should pass why run assertions if a custom command is provided
CHEF-3617 - Chef:: RunLock incorrectly assumes the full path to the run lock file exists before opening for writing
CHEF-3619 - Chef still has obsolete ‘rake/rdoctask' require
CHEF-3632 - All providers have whyrun enabled by …
- Opscode Blog: Cycle Computing Puts Chef 11 Through its Paces w/10K+ AWS Servers
- Opscode Blog: AWS OpsWorks Uses Opscode Chef as Default Automation Engine
- Engine Yard Developer Blog: Why Chef Should Manage Deploying Your Application
- OnRails.org: Moving (again) http://onrails.org from Heroku to EC2
- Signal vs. Noise: Looking for one more person to join our operations team
- paperplanes: Conference Talks You Should Be Watching
[ CHEF-3589 ] - Why Run code runs code in {{converge_by}} blocks after the provider action is complete
[ CHEF-3597 ] - knife.rb cannot handle frozen strings in chef_server_url (like from ENV)
[ CHEF-3619 ] - Chef still has obsolete 'rake/rdoctask' require
[ CHEF-3622 ] - Chef fails curl download with -bootstrap-proxy option
[ CHEF-3632 ] - All providers have whyrun enabled by default …
- till's blog: Getting the most out of Chef with Scalarium and vagrant
- AkitaOnRails.com - English: Chatting with Adam Jacob
- Momoro Machine: Getting started with Chef -- A tutorial
- Riding Rails - home: Community Highlights
- JJinuxLand: PyCon: Lightning Talks
- Ruby Inside: This Week in Ruby: Rubinius 2.0-rc1, Rake 10, Refactoring video, Passenger 4.0 supports JRuby, and more
Select " Android Application" in the Run As dialog, then click Ok
The emulator will boot Android
Then click and drag the lock to the right to unlock the virtual phone, your app will appear:
Let's take a brief look at what was generated:
Expand the src folder recursively until you can see and double-click on the MainActivity.java file. package com.yournamespace.savingsgoalsimulator; import android.os.Bundle; import android.app.Activity; import android.view.Menu; …
- DevInterface Blog: How to insert more Disqus comments box in a single page
- ZURB: Our Joyride jQuery Plugin Gets an Overhaul
- Engine Yard Developer Blog: Deploying Rails 3.1 Applications to Engine Yard Cloud
- giant robots smashing into other giant robots: Recipe: Ajax searching and filtering
- Simone Carletti's Blog: Book Review: Learning jQuery 1.3
- Orlando Ruby Users Group: jQuery Air 2 - Beta Test
White post-Christmas. Kids love it.
RailsPanel - Chrome extension to monitor Rails logs.
Iridium - Pre-release toolchain for Javascript application development.
Ruby 1.9.3-p362 is released - The official announcement.
Coercible - Gem for configurable coercion between Ruby data types.
Simple CI with git hooks for your rails projects - Run your tests using a post-commit hook.
- Trevor Turk: Links for 5-17-11
…opportunities for partners. Of particular note, 63% of IT spending is still focused on the ‘ Run' part of the IT infrastructure (probably not a big surprise to anyone reading this post). What I found most intriguing about the Gartner data was the points on emerging growth that Tiffani called out — namely the ‘ Transform / Grow' segments of the IT spend. This in particular speaks to the reasons why customers need and use New Relic.
As enterprises migrate to the cloud, …
- JJinuxLand: Amazon Web Services Summit 2011: Navigate the Cloud
- A Fresh Cup: Double Shot #722
- AkitaOnRails.com - English: QCon Special - Signing Off
- Giles Bowkett: Does Paul Graham Read Hacker News?
- Ruby Inside: The Mega Ruby News and Release Roundup for May 2012
- oldmoe: Ruby Networking on Steroids