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https://issues.apache.org/jira/browse/HDFS-11072?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15614029#comment-15614029
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SammiChen commented on HDFS-11072:
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Hi [~andrew.wang], thanks for fire this JIRA, I'd like to work on it. Here is
what I'am understanding. Correct me if I do't follow your thoughts.
Assume we create a directory A, set EC policy EC1 on A. then we create a sub
directory B under A. When B is created, it will inherit EC policy EC1 from A,
and save it as its own meta data. Later when directory A's EC policy EC1 is
unset or changed to EC2, that would not impact directory B. Directory B will
always has EC policy EC1 unless user explicitly change it. With this behavior,
we'are going to support the interleaved EC policy directory and 3x replication
directory.
> 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
> 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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