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From "Wei-Chiu Chuang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-10910) HDFS Erasure Coding doc should state its currently supported erasure coding policies
Date Thu, 29 Sep 2016 17:18:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-10910?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15533383#comment-15533383
] 

Wei-Chiu Chuang commented on HDFS-10910:
----------------------------------------

Thanks a lot [~linyiqun] for submitting the patch and thanks [~Sammi] for the first review.
I think the patch is mostly good, just one nit for clarity: 
bq. The current codec algorithms support three policies:
To be more specific, you may say "There are three policies currently being supported". A policy
constitutes a schema (=coding algorithm + data unit and parity unit) and a cell size.

> 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, HDFS-10910.002.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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