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Brandon Williams edited comment on CASSANDRA-18555 at 6/14/23 2:18 PM:
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bq. I do not see any dtest which would test failed decommission
I found [this
one|https://github.com/apache/cassandra-dtest/blob/trunk/topology_test.py#L212].
Maybe we don't need to go whole hog here and gossip a new state, I'm not sure
the utility of being able to observe a failed decom globally outweighs the
cost. I almost feel like adding the nodetool command was the simplest
solution, but not wanting to proliferate nodetool commands is valid.
was (Author: brandon.williams):
bq. I do not see any dtest which would test failed decommission
I found [this
one|https://github.com/apache/cassandra-dtest/blob/trunk/topology_test.py#L212].
Maybe we don't need to go whole hog here and gossip a new state, I'm not sure
the utility of being able to observe a failed decom globally outweighs the
cost. I almost feel like adding the nodetool command was the simplest
solution, but not wanting to proliferation nodetool commands is valid.
> A new nodetool/JMX command that tells whether node's decommission failed or
> not
> -------------------------------------------------------------------------------
>
> Key: CASSANDRA-18555
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18555
> Project: Cassandra
> Issue Type: Task
> Components: Observability/JMX
> Reporter: Jaydeepkumar Chovatia
> Assignee: Jaydeepkumar Chovatia
> Priority: Normal
> Time Spent: 3h 40m
> Remaining Estimate: 0h
>
> Currently, when a node is being decommissioned and if any failure happens,
> then an exception is thrown back to the caller.
> But Cassandra's decommission takes considerable time ranging from minutes to
> hours to days. There are various scenarios in that the caller may need to
> probe the status again:
> * The caller times out
> * It is not possible to keep the caller hanging for such a long time
> And If the caller does not know what happened internally, then it cannot
> retry, etc., leading to other issues.
> So, in this ticket, I am going to add a new nodetool/JMX command that can be
> invoked by the caller anytime, and it will return the correct status.
> It might look like a smaller change, but when we need to operate Cassandra at
> scale in a large-scale fleet, then this becomes a bottleneck and require
> constant operator intervention.
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