himanshukandwal opened a new issue, #2781:
URL: https://github.com/apache/helix/issues/2781
### Describe the bug
We are observing a NPE when we are trying to add a wa
```
org.apache.helix.HelixRebalanceException: Failed to compute for delayed
rebalance overwrites in cluster
ZnRecord=CLUSTER_TestWagedClusterExpansionWithAddingResourcesBeforeInstances,
{DELAY_REBALANCE_ENABLED=true, DELAY_REBALANCE_TIME=3000000,
FAULT_ZONE_TYPE=zone, PERSIST_BEST_POSSIBLE_ASSIGNMENT=true,
TOPOLOGY=/zone/instance,
TOPOLOGY_AWARE_ENABLED=true}{REBALANCE_PREFERENCE={EVENNESS=0,
LESS_MOVEMENT=10}}{}, Stat=Stat {_version=4, _creationTime=1710804015571,
_modifiedTime=1710804047240, _ephemeralOwner=0} Failure Type:
INVALID_CLUSTER_STATUS
at
org.apache.helix.controller.rebalancer.waged.WagedRebalancer.handleDelayedRebalanceMinActiveReplica(WagedRebalancer.java:428)
~[classes/:?]
at
org.apache.helix.controller.rebalancer.waged.WagedRebalancer.emergencyRebalance(WagedRebalancer.java:501)
~[classes/:?]
at
org.apache.helix.controller.rebalancer.waged.WagedRebalancer.computeBestPossibleAssignment(WagedRebalancer.java:339)
~[classes/:?]
at
org.apache.helix.controller.rebalancer.waged.WagedRebalancer.computeBestPossibleStates(WagedRebalancer.java:316)
~[classes/:?]
at
org.apache.helix.controller.rebalancer.waged.WagedRebalancer.computeNewIdealStates(WagedRebalancer.java:248)
[classes/:?]
at
org.apache.helix.controller.stages.BestPossibleStateCalcStage.computeResourceBestPossibleStateWithWagedRebalancer(BestPossibleStateCalcStage.java:406)
[classes/:?]
at
org.apache.helix.controller.stages.BestPossibleStateCalcStage.compute(BestPossibleStateCalcStage.java:258)
[classes/:?]
at
org.apache.helix.controller.stages.BestPossibleStateCalcStage.process(BestPossibleStateCalcStage.java:91)
[classes/:?]
at
org.apache.helix.controller.pipeline.Pipeline.handle(Pipeline.java:75)
[classes/:?]
at
org.apache.helix.controller.GenericHelixController.handleEvent(GenericHelixController.java:903)
[classes/:?]
at
org.apache.helix.controller.GenericHelixController$ClusterEventProcessor.run(GenericHelixController.java:1554)
[classes/:?]
Caused by: java.lang.NullPointerException
at
org.apache.helix.controller.rebalancer.util.DelayedRebalanceUtil.findToBeAssignedReplicasForMinActiveReplica(DelayedRebalanceUtil.java:335)
~[classes/:?]
at
org.apache.helix.controller.rebalancer.waged.model.ClusterModelProvider.generateClusterModel(ClusterModelProvider.java:257)
~[classes/:?]
at
org.apache.helix.controller.rebalancer.waged.model.ClusterModelProvider.generateClusterModelForDelayedRebalanceOverwrites(ClusterModelProvider.java:82)
~[classes/:?]
at
org.apache.helix.controller.rebalancer.waged.WagedRebalancer.handleDelayedRebalanceMinActiveReplica(WagedRebalancer.java:415)
~[classes/:?]
... 10 more
```
### To Reproduce
1. Create a WAGED resource with no instances belonging to the resource tag
2. Set # partitions as 0
3. Trigger Cluster rebalance
### Expected behavior
A clear and concise description of what you expected to happen.
### Additional context
Add any other context about the problem here.
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