Cassandra Summit videos

The presentations from the Cassandra Summit in San Francisco are posted here: http://www.planetcassandra.org/blog/post/cassandra-summit-2013---use-cases-and-technical-presentations


I listed some of my favourites below.

First would be my own presentation: "Crossing the Chasm - SQL to NoSQL": http://www.youtube.com/watch?v=wIjvZRLUXsE

Here is an awesome presentation on debugging Cassandra: "In Case Of Emergency, Break Glass": http://www.youtube.com/watch?v=7lY-33_Hn0Q

Titan is an up and coming graph database: "Distributed Graph Computing with Titan and Faunus": http://www.youtube.com/watch?v=tYAWhBHQiXA

Spotify talks about lessons learned using Cassandra: "How Not to Use Cassandra": http://www.youtube.com/watch?v=0u-EKJBPrj8

Storm Dependency

Hello, I am Isaac Rieksts a Software Developer.

Today, I wanted to talk briefly about how I worked around a dependency conflict when including storm in a webservice. 

Storm 0.8.2 has a direct dependency on commons-io 1.4, but includes compojure 1.1.3, which includes ring-core 1.1.5, which is dependent on commons-io 2.1.  This caused a problem when a module I wrote pulled in commons-io 2.1 from an internal module.  My module did not include storm. 

So the deployment ended up choosing commons-io 1.4 to deploy and got an error: java.lang.NoSuchMethodError: org.apache.commons.io.FileUtils.write(Ljava/io/File;Ljava/lang/CharSequence;Z)

Looks like this

Deployment bundler 0.0.1
  - webservice module 0.0.1
    - my module 0.0.1
      - internal module 0.0.1
        - commons-io 2.1
    - storm 0.8.2
      - commons-io 1.4
      - compojure 1.1.3 
        - ring-core 1.1.5
          - commons-io 2.1    

To fix this: I managed commons-io at the web container level:

<dependency>
  <groupId>commons-io</groupId>
  <artifactId>commons-io</artifactId>
  <version>2.1</version>
</dependency>

<dependency>
  <groupId>storm</groupId>
  <artifactId>storm</artifactId>
  <version>0.8.2</version>
  <exclusions>
    <exclusion>
      <artifactId>commons-io</artifactId>
      <groupId>commons-io</groupId>
    </exclusion>
  </exclusions>
</dependency>

Deployment bundler 0.0.1
  - webservice module 0.0.1
    - commons-io 2.1
    - my module 0.0.1
      - internal module 0.0.1
        - commons-io 2.1
    - storm 0.8.2 (Exclude commons-io)
      - compojure 1.1.3 
        - ring-core 1.1.5

Now the deployment works fine with no problems.