If you have cubes created with Kylin v0.6 and want to keep them when upgrade to v0.7, a migration is needed as the metadata structure is changed, please read:
https://github.com/apache/incubator-kylin/blob/0.7-staging/docs/Operations/Migrate%20v0.6.x%20metadata%20to%20v0.7.md -- Regards, Shaofeng, Shi
