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Date: Wed, 19 Apr 2017 00:29:41 +0000 (UTC)
From: "Kai Zheng (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13060584.1490943600000.312776.1492561781701@Atlassian.JIRA>
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Subject: [jira] [Commented] (HDFS-11604) Define and parse erasure code
 codecs, schemas and policies
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archived-at: Wed, 19 Apr 2017 00:29:46 -0000


    [ https://issues.apache.org/jira/browse/HDFS-11604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15973795#comment-15973795 ] 

Kai Zheng commented on HDFS-11604:
----------------------------------

Quick comments:
* {{PolicyLoader}} would be good to be {{ECPolicyLoader}}, as various policy concepts in Hadoop;
* The template {{ec_policy_sample.xml}} file would be good to be here: {{hadoop-hdfs-project/hadoop-hdfs/resources}};
* Can we move the policy parser/loader utility into this package in the client module: {{hadoop-hdfs-project/hadoop-hdfs-client/o.a.h.hdfs.util}}
* A minor: "Load predefined ec policies from configuration file." => "Load user defined ec policies from a XML configuration file."
* Minor: please avoid star/* imports.

> Define and parse erasure code codecs, schemas and policies
> ----------------------------------------------------------
>
>                 Key: HDFS-11604
>                 URL: https://issues.apache.org/jira/browse/HDFS-11604
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>            Reporter: Kai Zheng
>            Assignee: Lin Zeng
>             Fix For: 3.0.0-alpha3
>
>         Attachments: ec-config-sample.xml, ec-policy-config-sample-v2.xml, HDFS-11604-v1.patch, HDFS-11604-v2.patch, HDFS-11604-v3.patch, HDFS-11604-v4.patch
>
>
> According to recent discussions with [~andrew.wang] in HDFS-7337, it would be good to support allowing users to define their own erasure code codecs, schemas and policies via an XML file. The XML file can be passed to a CLI cmd to parse and send to NameNode to persist and maintain.
> Open this task to define the XML format providing a default sample file to put in the configuration folder for users' reference, and implement the necessary parser utility.


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