This is a simple example for getting started with loading data into a hadoop environment front ended by hive. Notice how much longer simple operations take than they do in a RDBMS. This is attributable to the fact hadoop has…
Month: April 2013
Can you run java hprof and a custom agentlib together?
We run newrelic, which is an Advanced Performance Management (APM) software stack that will profile your java application from the browser all the way to the database. It is really good software, affordable, and highly recommended. I also wanted to…
Linux threads and CPU affinity
Linux provides native threading capabilities. This allows a program to run with multiple processes all accessing the same shared data, without the headache of Interprocess Communication (IPC) calls. Essentially, a single process makes calls to the system pthread library to…
Query AS400/iSeries from JDBC
We are migrating an in house system from the AS400 to Oracle, and I needed to look at the data in its “raw” format to assist with a migration plan. I ended up using JDBC rather than the GUI provided…