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From "Andrew Wang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11426) Refactor EC CLI to be similar to storage policies CLI
Date Tue, 21 Feb 2017 23:37:44 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11426?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15877023#comment-15877023
] 

Andrew Wang commented on HDFS-11426:
------------------------------------

Thanks for the reviews [~tasanuma0829], [~surendrasingh], [~jojochuang]. I'm attaching a patch
that should address all the review feedback, except as noted below.

bq. 2. One extra space is required after Usage: in GetECPolicyCommand#run()

I also took the opportunity to fix this missing space in StoragePolicyAdmin, hope that's okay.

bq. It could be easier to understand with a more verbose output than printing the ec policy.

Hi [~jojochuang], what would you suggest to improve the output? I did make one new change
to just print the EC policy name instead of {{toString}} since I think it looks better and
matches the input to {{setPolicy}}:

{noformat}
-> % hdfs ec -listPolicies
Erasure Coding Policies:
	RS-10-4-64k
	RS-3-2-64k
	RS-6-3-64k
	RS-LEGACY-6-3-64k
	XOR-2-1-64k
-> % hdfs ec -getPolicy -path hdfs:///ecdir
RS-3-2-64k
{noformat}

> Refactor EC CLI to be similar to storage policies CLI
> -----------------------------------------------------
>
>                 Key: HDFS-11426
>                 URL: https://issues.apache.org/jira/browse/HDFS-11426
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: erasure-coding, shell
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>              Labels: hdfs-ec-3.0-must-do
>         Attachments: HDFS-11426.001.patch, HDFS-11426.002.patch, HDFS-11426.003.patch
>
>
> The {{hdfs erasurecode}} CLI is similar to {{hdfs storagepolicies}} in terms of functionality,
but different in terms of behavior. Let's refactor {{ECCli}} to be more similar to the various
Admin classes we already have, and also make its calling syntax mimic {{hdfs storagepolicies}}
as closely as possible.



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