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https://issues.apache.org/jira/browse/HDFS-12414?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16164351#comment-16164351
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SammiChen edited comment on HDFS-12414 at 9/13/17 9:03 AM:
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Thanks Huafeng and Kai for helping review the patch!
Rebase the patch
was (Author: sammi):
rebase the patch
> Ensure to use CLI command to enable/disable erasure coding policy
> -----------------------------------------------------------------
>
> Key: HDFS-12414
> URL: https://issues.apache.org/jira/browse/HDFS-12414
> Project: Hadoop HDFS
> Issue Type: Improvement
> Reporter: SammiChen
> Assignee: SammiChen
> Labels: hdfs-ec-3.0-nice-to-have
> Attachments: HDFS-12414.001.patch, HDFS-12414.002.patch,
> HDFS-12414.003.patch, HDFS-12414.004.patch
>
>
> Currently, there are two methods for user to enable/disable a erasure coding
> policy. One is through "dfs.namenode.ec.policies.enabled" property which is a
> static way to configure the enabled erasure coding policies. Another is
> through "enableErasureCodingPolicy" or "disabledErasureCodingPolicy" API
> which can enabled or disable erasure coding policy at runtime.
> When Namenode restart, there is potential state conflicts between the policy
> defined in "dfs.namenode.ec.policies.enabled" and policy saved in fsImage. To
> resolve the conflict and simplify the operation, it's better to use just one
> way and remove the old method configuring the property.
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