Hadoop
HBase JMX metrics
HBase exposes several metrics via JMX beans, some of which are similar to the Oracle performance counters recorded by AWR. Actually, they aren’t even *close* to what Oracle provides, but one can hope Below is a simple example of how these can be exposed: Download the jmx command line client jar from http://crawler.archive.org/cmdline-jmxclient/downloads.html Configure... »
Printing hadoop properties
The hadoop Configuration class implements the Iterable interface, so you can simply create a default configuration and list all properties, or pass a custom XML configuration file and print the properties from that. Below is a simple example. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 import... »
Getting started with map reduce
Map Reduce is a computer technology algorithm that is built on the age old concept of functional programming. The goals of functional programming can be simplistically described as: every program returns a value “map” lists of values to functions Map Reduce uses pieces of this methodology, defined as the following: Map – This function... »