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https://issues.apache.org/jira/browse/HDFS-11072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15615004#comment-15615004
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Rakesh R commented on HDFS-11072:
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Thanks [~Sammi], [~andrew.wang] for the good work. Just few thoughts.
bq.Agree, arbitrary replication factors should be supported
>From the jira subjectline I understand that the idea is to support
>unset/change EC policy only on a directory and not on the file. Also, I think
>you are not planning to touch(ec to non-ec while unsetting policy) any of the
>existing files under this directory on performing this operation. In that
>case, do we need to care about the replication factor. IIUC, the directory
>doesn't have the replication factor. Am I missing anything?
bq. Later, if we want to change the whole directory A from EC1 to EC2, we have
to recursively go through all directories under A, change it one by one. It
sounds not very convenient.
Yes, imho, its not required to recursively go through all directories under a
directory and apply unset/change policy. Probably we could make this function
call simple and apply the changes only to the given directory. If user wants,
then let them iterate and call this function multiple times.
bq. And since EC policy on a directory is either inherited from its parent or
explicitly set by admin, we need a flag to indicate whether the policy is
inherited or not
I'm interested to know, why do we differentiate that the policy is inherited
from its parent or explicitly set by admin.
> Add ability to unset and change directory EC policy
> ---------------------------------------------------
>
> Key: HDFS-11072
> URL: https://issues.apache.org/jira/browse/HDFS-11072
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha1
> Reporter: Andrew Wang
> Assignee: SammiChen
> Labels: hdfs-ec-3.0-must-do
>
> Since the directory-level EC policy simply applies to files at create time,
> it makes sense to make it more similar to storage policies and allow changing
> and unsetting the policy.
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