Could not find uri with key dfs.encryption.key.provider.uri to create a keyProvider in HDFS encryption for CDH 5.4
This issue was crossposted here: https://community.cloudera.com/t5/Storage-Random-Access-HDFS/Could-not-find-uri-with-key-dfs-encryption-key-provider-uri-to/td-p/31637
Main conclusion: It is a non-issue
Here is the answer that was provided by the support staff:
CDH's base release versions are just that: base. The fix for the harmless log print due to HDFS-7931 is present in all CDH5 releases since CDH 5.4.1.
If you see that error in context of having configured a KMS, then its a worthy one to consider. If you do not use KMS or EZs, then the error may be ignored. Alternatively upgrade to the latest CDH5 (5.4.x or 5.5.x) releases to receive a bug fix that makes the error only appear when in the context of a KMS being configured over an encrypted path.
Per your log snippet, I don't see a problem (the canary does not appear to be failing?). If you're trying to report a failure, please send us more characteristics of the failure, as HDFS-7931 is a minor issue with an unnecessary log print.