luhuichun updated HDFS-11975:
    Attachment: HDFS-11975-010.patch

thx [~Sammi] for review comments, updated

> Provide a system-default EC policy
> ----------------------------------
>                 Key: HDFS-11975
>                 URL: https://issues.apache.org/jira/browse/HDFS-11975
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha3
>            Reporter: Lei (Eddy) Xu
>            Assignee: luhuichun
>         Attachments: HDFS-11975-001.patch, HDFS-11975-002.patch, 
> HDFS-11975-003.patch, HDFS-11975-004.patch, HDFS-11975-005.patch, 
> HDFS-11975-006.patch, HDFS-11975-007.patch, HDFS-11975-008.patch, 
> HDFS-11975-009.patch, HDFS-11975-010.patch
> From the usability point of view, it'd be nice to be able to specify a 
> system-wide EC policy, i.e., in {{hdfs-site.xml}}. For most of users / admin 
> / downstream projects, it is not necessary to know the tradeoffs of the EC 
> policy, considering that it requires the knowledge of EC, the actual physical 
> topology of the clusters, and many other factors (i.e., network, cluster size 
> and etc).

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