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https://issues.apache.org/jira/browse/HDFS-11314?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15898546#comment-15898546
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Kai Zheng commented on HDFS-11314:
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I agree it's much safer to have admin configure and ensure the valid policies.
The list should only affect the choices that users would choose for other
files/folders, and incur no impact for existing erasure coded files/folders.
Thanks [~andrew.wang] for the great work!
One question and minor, noticed pretty many changes like follows and wondered
why. If we would allow user defined policies in future, due to whatever
considerations like new codec, new option even for existing codec and etc., I
guess the more general {{getPolicyByPolicyID}} name would be better.
{code}
- return ErasureCodingPolicyManager.getPolicyByPolicyID(
+ return ErasureCodingPolicyManager.getSystemPolicyByID(
{code}
> Enforce set of enabled EC policies on the NameNode
> --------------------------------------------------
>
> Key: HDFS-11314
> URL: https://issues.apache.org/jira/browse/HDFS-11314
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha1
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Priority: Blocker
> Labels: hdfs-ec-3.0-must-do
> Attachments: HDFS-11314.001.patch, HDFS-11314.002.patch,
> HDFS-11314.003.patch, HDFS-11314.004.patch
>
>
> Filing based on discussion in HDFS-8095. A user might specify a policy that
> is not appropriate for the cluster, e.g. a RS (10,4) policy when the cluster
> only has 10 nodes. The NN should only allow the client to choose from a
> pre-approved list determined by the cluster administrator.
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