Nara, you could try deleting the /data1/yarn/nm/usercache/hdfs directory from your datanodes - as suggested in here: http://community.cloudera.com/t5/Batch-Processing-and-Workflow/Can-t-create-directory-yarn-nm-usercache-urika-appcache/td-p/24891 That worked for me.
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Since the OS version is not supported, Cloudera Support will be unable to support the cluster. However if you do have a support contract, I'd suggest talking to your account rep who can provide a definite answer.
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