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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11604) Define and parse erasure code codecs, schemas and policies
Date Sat, 01 Apr 2017 01:04:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15951891#comment-15951891

Kai Zheng commented on HDFS-11604:

Some comments:
* We can use the name {{ec_policy_sample.xml}} instead. This sample file could be put into
Hadoop conf folder.
* We need a header as comment to list the system policies so that users won't redefine them
* Can we add some comments for some parts to specify some formats, like for {{cellsize}},
only {{k}}, {{m}} are allowed after a positive number.
* Can we use the real codecs and schemas available for now? I mean, {{rs-legacy}}, {{rs}}
and {{xor}}. {{HH}} ones aren't available to HDFS yet. For RS family, we can have 3 + 2, 6
+ 3 and 10 + 4 schemas. 

> 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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