GettingStarted - Cassandra Wiki: And now for the moment of truth, start up Cassandra by invoking bin/cassandra -f from the command line1. The service should start in the foreground and log gratuitously to standard-out. Assuming you don't see messages with scary words like "error", or "fatal", or anything that looks like a Java stack trace, then chances are you've succeeded.
Press "Control-C" to stop Cassandra.
If you start up Cassandra without "-f" option, it will run in background, so you need to kill the process to stop.
Monday, March 12, 2012
setup passphraseless ssh
setup passphraseless ssh
check whether you can ssh to the localhost without a passphrase:
$ ssh localhost
If you cannot ssh to localhost without a passphrase, execute the following commands:
$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
$ cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
Sunday, March 11, 2012
Welcome to Apache™ Hadoop™!
Welcome to Apache™ Hadoop™!: The Apache™ Hadoop™ project develops open-source software for reliable, scalable, distributed computing.
The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using a simple programming model. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. Rather than rely on hardware to deliver high-avaiability, the library itself is designed to detect and handle failures at the application layer, so delivering a highly-availabile service on top of a cluster of computers, each of which may be prone to failures.
The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using a simple programming model. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. Rather than rely on hardware to deliver high-avaiability, the library itself is designed to detect and handle failures at the application layer, so delivering a highly-availabile service on top of a cluster of computers, each of which may be prone to failures.
Where Wizards Fear To Tread - Perl.com
Where Wizards Fear To Tread - Perl.com: One of the big new features in perl 5.8 is that we now have real working threads available to us through the threads pragma.
However, for us module authors who already have to support our modules on different versions of perl and different platforms, we now have to deal with another case: threads! This article will show you how threads relate to modules, how we can take old modules and make them thread-safe, and round off with a new module that alters perl's behavior of the "current working directory".
To run the examples I have shown here, you need perl 5.8 RC1 or later compiled with threads. On Unix, you can use Configure -Duseithreads -Dusethreads; On Win32, the default build will always have threading enabled.
However, for us module authors who already have to support our modules on different versions of perl and different platforms, we now have to deal with another case: threads! This article will show you how threads relate to modules, how we can take old modules and make them thread-safe, and round off with a new module that alters perl's behavior of the "current working directory".
To run the examples I have shown here, you need perl 5.8 RC1 or later compiled with threads. On Unix, you can use Configure -Duseithreads -Dusethreads; On Win32, the default build will always have threading enabled.
Saturday, March 10, 2012
SQL Server 2012 Virtual Launch Event
SQL Server 2012 Virtual Launch Event: Go Further. Forward. Faster. with Microsoft SQL Server 2012!.
Immerse yourself in the exciting New World of Data with SQL Server 2012. Engage not only Microsoft product teams, but with our partners and our most ground breaking customers. SQL Server 2012 is part of the broadest Data Platforms in technology today. Discover how it enables mission critical confidence, blazing fast performance, and stunning interactive data visualizations.
Immerse yourself in the exciting New World of Data with SQL Server 2012. Engage not only Microsoft product teams, but with our partners and our most ground breaking customers. SQL Server 2012 is part of the broadest Data Platforms in technology today. Discover how it enables mission critical confidence, blazing fast performance, and stunning interactive data visualizations.
Simple Helix | Hosting Solutions
Simple Helix | Hosting Solutions: Magento Hosting
When your business is e-commerce, your website is critical, so it's important to build a site that is reliable and secure.
The Simple Helix platform is a high performance hosting environment that is built and optimized specifically for Magento to deliver that reliability and security, with the fastest page-loading speed for your website!
When your business is e-commerce, your website is critical, so it's important to build a site that is reliable and secure.
The Simple Helix platform is a high performance hosting environment that is built and optimized specifically for Magento to deliver that reliability and security, with the fastest page-loading speed for your website!
Dev-Team Blog - Welcome new A5 jailbreakers!
Dev-Team Blog - Welcome new A5 jailbreakers!: Welcome new A5 jailbreakers!
Here’s a quick breakdown of how many A5 owners have jailbroken their devices since Friday morning. The numbers as of Monday afternoon are:
491,325 new iPhone4,1 devices
308,967 new iPad2 devices
152,940 previously jailbroken (at 4.x) iPad2 devices
Total: 953,232 new A5 jailbreaks in a little over 3 days
The reason these numbers can be so precise is that one of the housekeeping activities that happens when you launch Cydia is a query to @saurik’s server for the list of available SHSH blobs. (Even if you have none on file, the query is still made).
Welcome to the jailbreak family!
P.S. Remember the cardinal rule of jailbreaking: never update your firmware until a new jailbreak is available. This is especially true for A5 owners, who currently have no way of restoring to 5.0.1 once the 5.0.1 SHSH blob signing window is closed.
Here’s a quick breakdown of how many A5 owners have jailbroken their devices since Friday morning. The numbers as of Monday afternoon are:
491,325 new iPhone4,1 devices
308,967 new iPad2 devices
152,940 previously jailbroken (at 4.x) iPad2 devices
Total: 953,232 new A5 jailbreaks in a little over 3 days
The reason these numbers can be so precise is that one of the housekeeping activities that happens when you launch Cydia is a query to @saurik’s server for the list of available SHSH blobs. (Even if you have none on file, the query is still made).
Welcome to the jailbreak family!
P.S. Remember the cardinal rule of jailbreaking: never update your firmware until a new jailbreak is available. This is especially true for A5 owners, who currently have no way of restoring to 5.0.1 once the 5.0.1 SHSH blob signing window is closed.
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