Siddhant Sangwan created HDDS-10461:
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Summary: Try to fail early when taking a Datanode offline isn't
possible because 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
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.
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