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Fix NPE in canCompleteSwap when path doesn't exist #3162

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Fix NPE in canCompleteSwap when path doesn't exist #3162

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4 changes: 4 additions & 0 deletions helix-core/src/main/java/org/apache/helix/manager/zk/ZKHelixAdmin.java
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Original file line number Diff line number Diff line change
Expand Up @@ -552,6 +552,10 @@ private boolean canCompleteSwap(String clusterName, String swapOutInstanceName,
List<String> swapOutResources = baseAccessor.getChildNames(
PropertyPathBuilder.instanceCurrentState(clusterName, swapOutInstanceName,
swapOutLastActiveSession), 0);
if (swapOutResources == null) {
// No current states found for the swap-out instance, swap is complete
return true;
}
for (String swapOutResource : swapOutResources) {
// Get the topState and secondTopStates for the stateModelDef used by the resource.
IdealState idealState = accessor.getProperty(keyBuilder.idealStates(swapOutResource));
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