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Debugging HBase Unit Tests

By on November 13, 2016

This is likely an obvious process for those who use IDE’s and develop in Maven daily but for those who do operations or otherwise need to work on the JUnit tests in HBase only infrequently, here’s how I worked when submitting a patch for HBASE-16700. First, create your code: Here I was adding a MasterObserver […]

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Finding HBase Region Locations

By on June 8, 2015

HBase Region Locality HBase provides information on region locality via JMX per region server via the hbase.regionserver.percentFilesLocal. However, there is a challenge when running a multi-tenant environment or doing performance analysis. This percent of files local is for the entire region server but of course each region server can serve regions for multiple tables. And […]

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Configuration Files

By on October 21, 2012

Many systems have requirements to store configuration parameters. In these systems, a number of choices can be made for how to store that data; sometimes this diversity is painful, however. Choices for storing configuration data are often: Firefox uses and Apple often chooses to use sqlite3 databases1 Python programs often use ConfigParser to process initialization (.ini) […]

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Alias does not work in KSH functions

By on August 14, 2012

Today, I ran into an aggravating situation. I found that a command which is set-up by sourcing a script with some alias commands in it. But, the script was failing to resolve the alias. I got alias_command: command not found instead of proper resolution. Even more aggravating, running the type built-in on the alias showed that it existed, and was set as expected, but to no success when calling it.
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Accessing Kerberized HDFS via Jython

By on May 4, 2012

How to access HDFS on a Kerberos secured Hadoop cluster — code and background!

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When do people work?

When do people work?

By on September 26, 2010

Ever wonder when people are actually working? It can be hard answering, “when are people at work?” On a distributed team, with many co-workers and the typical corporate dotted-line type relationships, it is even harder! Inevitably communications on schedule shifts and desired schedules go un-communicated. A few years ago, this occurred for folks I worked […]

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