Max Jobconf exceeded

[Mark]

I'm running the Mahout Frequent Pattern Mining Job 
(org.apache.mahout.fpm.pfpgrowth.FPGrowthDriver) and I keep receiving 
the following:

Caused by: java.io.IOException: Exceeded max jobconf size: 94278797 
limit: 524288

Can someone explain the cause of this and more importantly the resolution?

Thanks