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https://issues.apache.org/jira/browse/HDFS-11428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrew Wang updated HDFS-11428:
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Status: Patch Available (was: Open)
> Change setErasureCodingPolicy to take a required string EC policy name
> ----------------------------------------------------------------------
>
> Key: HDFS-11428
> URL: https://issues.apache.org/jira/browse/HDFS-11428
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha1
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Labels: hdfs-ec-3.0-must-do
> Attachments: HDFS-11428.001.patch, HDFS-11428.002.patch
>
>
> The current {{setErasureCodingPolicy}} API takes an optional {{ECPolicy}}.
> This makes calling the API harder for clients, since they need to turn a
> specified name into a policy, and the set of available EC policies is only
> available on the NN.
> You can see this awkwardness in the current EC cli set command: it first
> fetches the list of EC policies, looks for the one specified by the user,
> then calls set. This means we need to issue two RPCs for every set
> (inefficient), and we need to do validation on the NN side anyway (extraneous
> work).
> Since we're phasing out the system default EC policy, it also makes sense to
> make the policy a required parameter.
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