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From "SammiChen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10910) HDFS Erasure Coding doc should state its currently supported erasure coding policies
Date Wed, 28 Sep 2016 07:24:21 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15528702#comment-15528702
] 

SammiChen commented on HDFS-10910:
----------------------------------

It's great to add currently supported erasure coding policies in the doc. I would suggest,
1. Since default cell size is mentioned, it's better to add the default cell size number in
the doc. 
2. Default schema is "RS_6_3_SCHEMA".
3. A policy has a schema and the stripping cell size. It seems schema name is used as the
policy name when we talk about currently supported policies. 




> HDFS Erasure Coding doc should state its currently supported erasure coding policies
> ------------------------------------------------------------------------------------
>
>                 Key: HDFS-10910
>                 URL: https://issues.apache.org/jira/browse/HDFS-10910
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: documentation, erasure-coding
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Wei-Chiu Chuang
>            Assignee: Yiqun Lin
>         Attachments: HDFS-10910.001.patch
>
>
> While HDFS Erasure Coding doc states a variety of possible combinations of algorithms,
block group size and cell size, the code (as of 3.0.0-alpha1) allows only three policies:
RS_6_3_SCHEMA, RS_3_2_SCHEMA and RS_6_3_LEGACY_SCHEMA. All with default cell size. I think
this should be documented.



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