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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7859) Erasure Coding: Persist erasure coding policies in NameNode
Date Thu, 11 Aug 2016 21:26:20 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15417965#comment-15417965

Zhe Zhang commented on HDFS-7859:

Thanks for the comment Kai. Even without the patch in this JIRA, we are already supporting
multiple built-in policies ({{SYS_POLICIES}}). This JIRA adds support to add non-builtin policies
-- therefore we need to persist EC polices in fsimage (otherwise all policies are just in
the code). And we are adding the {{addErasureCodingPolicy}} API in this change. Sounds like
we both agree {{removeErasureCodingPolicy}} can be done separately. But I think that follow-on
should be done before beta release for API stability. [~xinwei] Do you have time to work on
that as well? Thanks.

> Erasure Coding: Persist erasure coding policies in NameNode
> -----------------------------------------------------------
>                 Key: HDFS-7859
>                 URL: https://issues.apache.org/jira/browse/HDFS-7859
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: Kai Zheng
>            Assignee: Xinwei Qin 
>              Labels: BB2015-05-TBR, hdfs-ec-3.0-must-do
>         Attachments: HDFS-7859-HDFS-7285.002.patch, HDFS-7859-HDFS-7285.002.patch, HDFS-7859-HDFS-7285.003.patch,
HDFS-7859.001.patch, HDFS-7859.002.patch, HDFS-7859.004.patch, HDFS-7859.005.patch
> In meetup discussion with [~zhz] and [~jingzhao], it's suggested that we persist EC schemas
in NameNode centrally and reliably, so that EC zones can reference them by name efficiently.

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