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https://issues.apache.org/jira/browse/HDFS-14061?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16734313#comment-16734313
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Kitti Nanasi commented on HDFS-14061:
-------------------------------------
Patch 001 contains:
* A warning is shown if the cluster topology verify fails for all enabled
policies, when enabling a policy.
* Policy setting fails if the cluster topology verification fails for the
policy
There could be one concern with the second one, if we want to set RS(6,3)
policy, the verify will only succeed if there are at least 9 data nodes which
may be a bit strict. Should we allow setting the policy with less data nodes
than 9? I would like to hear some opinions about that.
> Check if the cluster topology supports the EC policy before setting, enabling
> or adding it
> ------------------------------------------------------------------------------------------
>
> Key: HDFS-14061
> URL: https://issues.apache.org/jira/browse/HDFS-14061
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: erasure-coding, hdfs
> Affects Versions: 3.1.1
> Reporter: Kitti Nanasi
> Assignee: Kitti Nanasi
> Priority: Major
> Attachments: HDFS-14061.001.patch
>
>
> HDFS-12946 introduces a command for verifying if there are enough racks and
> datanodes for the enabled erasure coding policies.
> This verification could be executed for the erasure coding policy before
> enabling, setting or adding it and a warning message could be written if the
> verify fails, or the policy setting could be even failed in this case.
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