[jira] [Created] (HDFS-14975) Add CR for SetECPolicyCommand usage

["Fei Hui (Jira)" <ji...@apache.org>]

Fei Hui created HDFS-14975:
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             Summary: Add CR for SetECPolicyCommand usage
                 Key: HDFS-14975
                 URL: https://issues.apache.org/jira/browse/HDFS-14975
             Project: Hadoop HDFS
          Issue Type: Improvement
    Affects Versions: 3.3.0
            Reporter: Fei Hui


*bin/hdfs ec -help* output the following message
{quote}
[-listPolicies]

Get the list of all erasure coding policies.

[-addPolicies -policyFile <file>]

Add a list of user defined erasure coding policies.
<file>  The path of the xml file which defines the EC policies to add 

[-getPolicy -path <path>]

Get the erasure coding policy of a file/directory.

<path>  The path of the file/directory for getting the erasure coding policy 

[-removePolicy -policy <policy>]

Remove an user defined erasure coding policy.
<policy>  The name of the erasure coding policy 

[-setPolicy -path <path> [-policy <policy>] [-replicate]]

Set the erasure coding policy for a file/directory.

<path>      The path of the file/directory to set the erasure coding policy 
<policy>    The name of the erasure coding policy                           
-replicate  force 3x replication scheme on the directory                    

-replicate and -policy are optional arguments. They cannot been used at the same time
[-unsetPolicy -path <path>]

Unset the erasure coding policy for a directory.

<path>  The path of the directory from which the erasure coding policy will be 
        unset.                                                                 

[-listCodecs]

Get the list of supported erasure coding codecs and coders.
A coder is an implementation of a codec. A codec can have different implementations, thus different coders.
The coders for a codec are listed in a fall back order.

[-enablePolicy -policy <policy>]

Enable the erasure coding policy.

<policy>  The name of the erasure coding policy 

[-disablePolicy -policy <policy>]

Disable the erasure coding policy.

<policy>  The name of the erasure coding policy 

[-verifyClusterSetup [-policy <policy>...<policy>]]

Verify if the cluster setup can support all enabled erasure coding policies. If optional parameter -policy is specified, verify if the cluster setup can support the given policy.

{quote}
The output format is not so good to users
We should add CR between SetECPolicyCommand and UnsetECPolicyCommand like other commands




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