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https://issues.apache.org/jira/browse/HDDS-10461?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17910068#comment-17910068
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István Fajth commented on HDDS-10461:
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May we close this one if everything is impemented here?
cc: [~tejaskriya09]
> Try to fail early when taking a Datanode offline isn't possible because of
> insufficient number of Datanodes in the cluster
> --------------------------------------------------------------------------------------------------------------------------
>
> Key: HDDS-10461
> URL: https://issues.apache.org/jira/browse/HDDS-10461
> Project: Apache Ozone
> Issue Type: Epic
> Components: SCM
> Reporter: Siddhant Sangwan
> Assignee: Tejaskriya Madhan
> Priority: Major
>
> Many users test out Ozone in small clusters of 15 Datanodes or less. If a 15
> DN cluster has some EC 10-4 containers, for example, then it's not possible
> to decommission more than 1 Datanode, because EC 10-4 requires at least 14
> Datanodes. If someone tries to decommission two Datanodes, the
> decommissioning process is designed such that it will keep looping and
> checking every 30 seconds whether it's possible to take the two DNs offline.
> It will never fail, even though it's clearly not possible to take the
> Datanodes offline.
> This epic aims to implement a basic algorithm that will calculate whether
> it's possible to take the requested number of Datanodes offline. The
> expectation is that a decommission or maintenance request should return an
> error without looping continuously if the cluster doesn't have the sufficient
> number of Datanodes. While this isn't a problem in large, typical clusters,
> it'll certainly make the user experience better for POC style small clusters.
> Splitting this into separate tasks for decommission, maintenance, and
> integration testing.
>
> Attaching a design doc -
> [https://docs.google.com/document/d/1DPbvS__I1iIwYtjXVH4zYjrMCPeAIguo4evH-dS5dhA/edit?usp=sharing.]
> Reviews and suggestions are welcome!
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