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From "SammiChen (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7859) Erasure Coding: Persist erasure coding policies in NameNode
Date Wed, 30 Aug 2017 08:34:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16146892#comment-16146892
] 

SammiChen commented on HDFS-7859:
---------------------------------

[~eddyxu] mentioned upgrade and downgrade, it's a good question. Not only user defined ec
policy, but also built-in ec policy will face this issue. The major problem is if a codec
is no longer supported after upgrade or downgrade,  how to handle these type of ec policies
in the new cluster, also how to handle the files/directories which used these no long supported
files?  I tend to keep these ec policies in {{ErasureCodingPolicyManager}}, while mark it
as obsolete, and also load these files/directories into the namespace so that user can go
through the tree structures(read file cannot be supported). I will do some experiment to see
if it works. 
Any other suggestions are welcome. [~andrew.wang], [~drankye], [~eddyxu]

> 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: SammiChen
>         Attachments: HDFS-7859.001.patch, HDFS-7859.002.patch, HDFS-7859.004.patch, HDFS-7859.005.patch,
HDFS-7859.006.patch, HDFS-7859.007.patch, HDFS-7859.008.patch, HDFS-7859.009.patch, HDFS-7859.010.patch,
HDFS-7859.011.patch, HDFS-7859-HDFS-7285.002.patch, HDFS-7859-HDFS-7285.002.patch, HDFS-7859-HDFS-7285.003.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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