[HDFS-12087] The error message is not friendly when set a path with the policy not enabled

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Not A Problem
• Affects Version/s: 3.0.0-beta1, 3.0.0-alpha3
• Fix Version/s: 3.0.0-beta1
• Component/s: hdfs
• Labels: hdfs-ec-3.0-nice-to-have
• Target Version/s: 3.1.0
• Assignee: lufei
• Reporter: lufei
• Created: 05/Jul/17 03:22
• Updated: 02/Feb/18 01:27
• Resolved: 02/Feb/18 01:27

Description

First user add a policy by -addPolicies command but not enabled, then user set a path with this policy. The error message displayed as below:
RemoteException: Policy 'XOR-2-1-128k' does not match any enabled erasure coding policies: []. The set of enabled erasure coding policies can be configured at 'dfs.namenode.ec.policies.enabled'.

The policy 'XOR-2-1-128k' is added by user but not be enabled.The error message is not promot user to enable the policy first.I think the error message may be better as below:
RemoteException: Policy 'XOR-2-1-128k' does not match any enabled erasure coding policies: []. The set of enabled erasure coding policies can be configured at 'dfs.namenode.ec.policies.enabled' or enable the policy by '-enablePolicy' EC command before.