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https://issues.apache.org/jira/browse/HDFS-7866?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15186073#comment-15186073
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Jing Zhao commented on HDFS-7866:
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There are already too many debates about optional and required. Maybe that's
why these two keywords are removed from protobuf 3. To me we should use
optional for all the fields in ErasureCodingPolicyProto. This change can be
done separately. But I think at least here we should use optional for the new
field.
> Erasure coding: NameNode manages multiple erasure coding policies
> -----------------------------------------------------------------
>
> Key: HDFS-7866
> URL: https://issues.apache.org/jira/browse/HDFS-7866
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Kai Zheng
> Assignee: Rui Li
> Attachments: HDFS-7866-v1.patch, HDFS-7866-v2.patch,
> HDFS-7866-v3.patch, HDFS-7866.10.patch, HDFS-7866.11.patch,
> HDFS-7866.12.patch, HDFS-7866.13.patch, HDFS-7866.4.patch, HDFS-7866.5.patch,
> HDFS-7866.6.patch, HDFS-7866.7.patch, HDFS-7866.8.patch, HDFS-7866.9.patch
>
>
> This is to extend NameNode to load, list and sync predefine EC schemas in
> authorized and controlled approach. The provided facilities will be used to
> implement DFSAdmin commands so admin can list available EC schemas, then
> could choose some of them for target EC zones.
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