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https://issues.apache.org/jira/browse/HDFS-11072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15625732#comment-15625732
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Rakesh R commented on HDFS-11072:
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Thanks a lot [~andrew.wang] for the detailed explanation.
bq. It might also be nice to provide a CLI tool that prints the policies on the
parent directories of a path.
This is really an interesting thought. I hope your idea is that, users can
easily find the difference in EC policies between the given path and its parent
directory path. If I take the above example, for the given {{/A/B/R}} path, say
R has "replicated" EC policy and its parent {{/A/B}} has "rs-default" policy.
bq. Hopefully the above example clarified this, but basically if we want a
subdir of a directory with an EC policy (e.g. /A/B/R) to create replicated
files, we need to set a policy that's not the default "inherit from parent"
policy.
Yes, its a good case. I understand the need of "replicated" EC policy. I hope
this can be done via separate task and there is no jira raised for this. I'm
happy to start thinking about the implementation, shall I raise a jira for this?
> 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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