Disclaimer: I work for CleverScale: the company that developed the CDN federation tool hereby mentioned. This is the first of a series of “How-Tos” on how to use a CDN to accelerate the most diffused CMSes and Blog packages with the least impact possible. Joomla! is one of the most diffused CMS, it accounts for [...]
Ceph is a distributed Object Storage and file system, it’s a distinctive piece of software in its own category for two reasons: It is developed in C++ (thus, offering speed and device-level integration) It provides a shared network block device driver offering POSIX access to Linux (the Kernel module is the subject of this post). [...]
SARA, the Dutch National High Performance Computing (HPC) and e-Science Support Center, is organizing a “Hadoop Hackton“. The event is scheduled for December 7th 2010 to be held at their premises in Amsterdam (Science Park 121). The “hackathon” will be a hands-on introduction to Hadoop. Attendees are invited to come spend a day at SARA [...]
When Installing a Jobtracker of any Hadoop cluster, be careful on how these two files interact each other: /etc/hosts $HADOOP_HOME/conf/mapred-site.xml To make a long story short, this is very wrong: $>cat /etc/hosts 127.0.0.1 localhost tophat 192.168.3.60 tophat And, if you resolve to hostname in mapred-site.xml $>cat $HADOOP_HOME/conf/mapred-site.xml <!– Put site-specific property overrides in this file. [...]
Warning: this material is outdated, a set of empirical tests was under works but never saw the light It happens, once that one does something wrong without knowing where he is making a mistake.. This is what happened yesterday when I used mysqlslap test bench on an Amazon RDS machine. The problem is that mysqlslap [...]
