Andrew Wang created HDFS-11428:
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Summary: 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
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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