Currently we have cluster running on cdhversion4, with mapreduce. And planning to upgrade to CDH5 with YARN. Does cloudera manager capable of preserving HDFS data during CDH upgrade window... ??
Data on the HDFS filesystem is not removed during the upgrade process. The upgrade process is documented here:
For Cloudera Canager (CM)-
For CDH4 to CDH5 in a CM managed cluster
For CDH only environments