Due to changes in licensing terms, automatic download from Oracle of the sunjdk is not working. Hence Hadoop installs but fails to launch. To add insult to injury, launch-cluster doesn't fail and I couldn't find a related message in the logs. Potential workarounds need to take into account that it seems like a human has to click on the dreaded Oracle TOS (disclaimer: I am not a lawyer and will never be). How to make that happen with whirr is unclear. The option of not supporting sunjdk seems unappealing as there is limited testing experience with it, I hear from people at Cloudera. But the apache hadoop compatibility page states that that sunjdk is needed only for building. Clarity on this would be helpful to plan ahead.