Stephen O'Donnell created HDDS-4989:
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Summary: Decommission CLI should return details of nodes which fail
Key: HDDS-4989
URL: https://issues.apache.org/jira/browse/HDDS-4989
Project: Apache Ozone
Issue Type: Improvement
Components: SCM, SCM Client
Reporter: Stephen O'Donnell
Assignee: Stephen O'Donnell
With the current decommission / recommission / maintenance mode commands, you
can pass a list of hosts to perform the operation on. If any of these hosts
fail to enter the decommission / maintenance workflow, the command gives no
feedback about the error. Some of the hosts can silently fail and the only way
to know is to inspect the SCM log.
The most common way a host can fail, is if a node which is undergoing
maintenance is instructed to go to decommission and vice versa as this is a
transition which is not allowed.
This change will allow any failed nodes to feed back to the client. If the
client detects that any of the nodes have failed, details will be written to
stderr and the command exit code will be non-zero.
Note that even though the exit code is non-zero, the command may have partially
worked.
Also note that the errors which are fed back are only around transitioning the
node into the admin workflow - it is still possible for it to fail later for
other reasons which will not be fed back to the client. This is because the
client does not wait for the process to complete, but exits after confirmation
the command has been processed by scm.
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