We realize that the new Kylin version brings great performance improvement.So we decide to update our old kylin. I have read the doc about kylin upgrade. In some step,I feel puzzled. 1. Kylin 1.5.1 is not backward compatible in terms of metadata ( in upgrade doc ).But I see Kylin1.5.0's release announcement : This version is not backward compatible. The format of cube and metadata has been refactored in order to get times of performance improvement. We recommend this version, but does not suggest upgrade from previous deployment directly. Is kylin metadata changed twice in the two versions ? 2. If I upgrade Kylin1.1.1 to Kylin1.5.1, In hybrid model Old cube segments built in kylin1.1.1 will still be built(only fresh) in old build engine and have their old cube metadata,new segments of old cubes can use all functions of new version. Is there anything wrong ?
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