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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-11605) Allow user to customize and add new erasure code codecs and policies
Date Wed, 19 Apr 2017 03:02:41 GMT

    [ https://issues.apache.org/jira/browse/HDFS-11605?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15973975#comment-15973975

Kai Zheng commented on HDFS-11605:

Some quick comments:

In NN side, when to add the new policies, we need to:
* Validate each policy to ensure its parameters are all in good form;
* Check its uniqueness among existing policies to make sure no conflict. I thought EC policy
and/or schema have implemented {{equal()}} method?

A minor: "Add Erasure coding policies to HDFS." => "Add erasure coding policies."

> Allow user to customize and add new erasure code codecs and policies
> --------------------------------------------------------------------
>                 Key: HDFS-11605
>                 URL: https://issues.apache.org/jira/browse/HDFS-11605
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>            Reporter: Kai Zheng
>            Assignee: Huafeng Wang
>             Fix For: 3.0.0-alpha3
>         Attachments: HDFS-11605.001.patch
> Based on the facility developed in HDFS-11604, this will develop necessary CLI cmd to
load an XML file and the results will be maintained in NameNode {{ErasureCodingPolicyManager}}
as {{USER_POLICIES}} in line with {{SYS_POLICIES}}.

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