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Talk on 'Getting Started with Hadoop'

This repo tracks all source code, data samples and visualization examples for my talks on 'Getting Started with Hadoop'.

Data and Visualizations

Data can be found in the data directory including raw logs courtesy of @maxheadroom from mac-geeks.de. The final results of the Apache access log throughput script are also loaded up into a Google Docs spreadsheet for ad-hoc analysis and visualization. The src/html directory contains a simple page with example visualizations using Google Chart API's time series chart.

Dependencies

All dependencies are managed currently in the Maven pom. There are a few, however, that need to be added to your repository (local or otherwise) before continuing. They are all documented inline in the dependencies of the Maven pom. We assume that you have installed Pig and have the $PIG_HOME environment variable defined (it's referenced in the pom comments on installing local dependencies).

Testing

Unit testing of Pig is currently done using PigUnit, a new xUnit style testing harness released in Pig 0.8.0. Since this is it's debut there are a few quirks to be aware of:

  • heap space is at a premium when running the Pig scripts, so max heap space JVM parameters need to be set (to something like-Xmx1024m)
    • running tests from Maven: configured in the Maven pom to run the Surefire plugin with a fixed max heap space setting
    • running tests from Eclipse: use the JUnit Lanch Fixer plugin and set the max heap space for all JUnit executions automatically (note that if you have previous failed launches, you should delete them before running again)

Running

Checkout the source and build it with the Maven assembly plugin.

mvn assembly:assembly

The demo is done using the Cloudera training VM v0.3.5 with CDH3b3. Here are the steps to run the demo. This assumes that you move/copy/mount the Git directory/checkout onto the VM.

hadoop fs -rmr access-log-throughput-mr; hadoop jar target/hadoop-getting-started-1-SNAPSHOT-jar-with-dependencies.jar net.joshdevins.talks.hadoopstart.mr.AccessLogThroughputDriver
hadoop fs -cat access-log-throughput-mr/part-* | more

hadoop fs -rmr access-log-throughput; java -cp target/hadoop-getting-started-1-SNAPSHOT-jar-with-dependencies.jar:/etc/hadoop/conf org.apache.pig.Main -logfile target/pig.log src/main/pig/access-log-throughput.pig
hadoop fs -cat access-log-throughput/part-* | more