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https://issues.apache.org/jira/browse/HDFS-11623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15961289#comment-15961289
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Andrew Wang commented on HDFS-11623:
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Thanks for reviewing Wei-chiu! New patch to simplify the array as noted, and
also to hopefully get a working precommit. Not sure why the build failed like
that, it builds for me locally.
Enabled policies work as you describe. The idea is that admins can restrict the
set of policies used by the cluster. It doesn't affect already written files
since they should still be readable. It doesn't affect already set policies to
reduce user surprise, though we chould reconsider this and instead treat it
similarly to min-replication. Thoughts?
Agree that ECPManager looks quite simple now, but it'll be fleshed by the
pluggable policy work at HDFS-7337. Kai sketched out the new responsibilities
above.
> Move system erasure coding policies into hadoop-hdfs-client
> -----------------------------------------------------------
>
> Key: HDFS-11623
> URL: https://issues.apache.org/jira/browse/HDFS-11623
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: erasure-coding
> Affects Versions: 3.0.0-alpha2
> Reporter: Andrew Wang
> Assignee: Andrew Wang
> Attachments: HDFS-11623.001.patch, HDFS-11623.002.patch,
> HDFS-11623.003.patch, HDFS-11623.004.patch, HDFS-11623.005.patch
>
>
> This is a precursor to HDFS-11565. We need to move the set of system defined
> EC policies out of the NameNode's ECPolicyManager into the hdfs-client module
> so it can be referenced by the client.
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