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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HDFS-11604) Define and parse erasure code codecs, schemas and policies
Date Sat, 01 Apr 2017 00:53:42 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951882#comment-15951882
] 

Kai Zheng edited comment on HDFS-11604 at 4/1/17 12:53 AM:
-----------------------------------------------------------

Thanks [~Sammi] for the quick work. For easy discussion, put the content below:
{code}
<configuration>
<schemas>
	<schema id="HHk6m3">
		<codec>HH</codec>
		<k>6</k>
		<m>3</m>
	</schema>
	<schema id="RSk12m4">
		<codec>RS</codec>
		<k>12</k>
		<m>4</m>
	</schema>
</schemas>	
<policies>
	<policy>
		<schema>HHk6m3</schema>
		<cellsize>128k</cellsize>
	</policy>
	<policy>
		<schema>RSk12m4</schema>
		<cellsize>256k</cellsize>
	</policy>
</policies>	
</configuration>
{code}


was (Author: drankye):
Thanks [~Sammi] for the quick work. For each discussion, put the content below:
{code}
<configuration>
<schemas>
	<schema id="HHk6m3">
		<codec>HH</codec>
		<k>6</k>
		<m>3</m>
	</schema>
	<schema id="RSk12m4">
		<codec>RS</codec>
		<k>12</k>
		<m>4</m>
	</schema>
</schemas>	
<policies>
	<policy>
		<schema>HHk6m3</schema>
		<cellsize>128k</cellsize>
	</policy>
	<policy>
		<schema>RSk12m4</schema>
		<cellsize>256k</cellsize>
	</policy>
</policies>	
</configuration>
{code}

> 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
>
>
> 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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