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From "Xinwei Qin (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7859) Erasure Coding: Persist erasure coding policies in NameNode
Date Wed, 17 Aug 2016 15:56:22 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15424774#comment-15424774
] 

Xinwei Qin  commented on HDFS-7859:
-----------------------------------

Hi, [~zhz]
 I have updated the patch. About your comments, I have fixed 1, 2, 5, 6, 7. About 3 and 4,
I think the current method name and usage may be more suitable, because {{addErasureCodingPolicy}}
always does not need lock the {{FSDirectory}}, which is similar to the {{addCacheDirective}}.

> 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, HDFS-7859.006.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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