I get following error when I run a spark job with Druid Tranquility.

```
java.lang.NoSuchFieldError: WRITE_DURATIONS_AS_TIMESTAMPS

```

Druid Tranquility uses higher version of jackson-databind (2.6.1) than what is bundled in spark. 
I'm using latest stable versions of Druid Tranquility(0.6.4) and Spark(1.5.2). 

How to resolve this?

1. Force spark to use the classes supplied with the job and not the classes bundled in spark. How?
2. Compile spark with the new version of jackson-databind
3. Force Tranquility to use old version. (Doesn't seem to work, tried to exclude in sbt)
4. Any other way?