dongjoon-hyun opened a new pull request, #866:
URL: https://github.com/apache/spark-kubernetes-operator/pull/866

   ### What changes were proposed in this pull request?
   
   This PR aims to stop `ClusterUnknownStateStep` from appending a new `Failed` 
state to a `SparkCluster` that is already `Failed`. For such a cluster, it now 
completes the reconciliation without persisting any status and without 
requeueing.
   
   The existing `SchedulingFailure -> Failed` transition is unchanged.
   
   ### Why are the changes needed?
   
   Currently, a failed `SparkCluster` falls into an infinite status-write loop.
   
   - `ClusterTerminatedStep` stops the reconciliation only for 
`ResourceReleased`, which is never set for a cluster. So a `SchedulingFailure` 
or `Failed` cluster always reaches `ClusterUnknownStateStep`.
   - `ClusterUnknownStateStep` always appends a new `Failed` state, persists 
it, and returns `completeAndImmediateRequeue()`.
   - Each appended state has a new history key and a new timestamp, so 
`StatusRecorder` never skips the write as unchanged, and every reconciliation 
issues a `/status` PUT.
   
   As a result, any `ClusterInitStep` failure (for example, a transient 
429/5xx/timeout on server-side apply, or a Kueue spec conflict) makes the 
cluster loop at the JOSDK rate limit (about 20 status PUTs per minute), 
emitting `Failed` events. `stateTransitionHistory` grows without bound until 
the object approaches the etcd size limit. The only recovery is to delete the 
CR.
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes, this fixes a bug. A failed `SparkCluster` no longer keeps growing 
`status.stateTransitionHistory` or emitting repeated `Failed` status updates.
   
   ### How was this patch tested?
   
   Pass the CIs with the newly added test case.
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   Generated-by: Claude Opus 5.5


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