snleee commented on code in PR #9774:
URL: https://github.com/apache/pinot/pull/9774#discussion_r1018655342
##########
pinot-controller/src/main/java/org/apache/pinot/controller/helix/core/assignment/segment/BaseSegmentAssignment.java:
##########
@@ -126,6 +127,15 @@ protected Pair<List<Map<String, Map<String, String>>>,
Map<String, Map<String, S
_logger.info("Rebalancing tier: {} for table: {} with bootstrap: {},
instance partitions: {}", tierName,
_tableNameWithType, bootstrap, tierInstancePartitions);
+
+ // Set the default assignment strategy in case if it not set already
+ // Assuming all tiers use the same assignment strategy
+ if (segmentAssignmentStrategy == null) {
Review Comment:
Given that `segmentAssignmentStrategy` is not annotated as `@Nullable`, we
can assume that `segmentAssignmentStrategy` will never be `null` in the
perspective of `BaseSegmentAssignment`. IMO, we should handle this null issue
in the caller of this function, which is `RealtimeSegmentAssignment`.
In `RealtimeSegmentAssignment`, we correctly handle for `OFFLINE/COMPLETED`;
however, I think that the current code can pass `null` for `rebalanceTiers()`
function.
We should update the following part `RealtimeSegmentAssignment:L193`:
```
SegmentAssignmentStrategy segmentAssignmentStrategy = null;
if (completedInstancePartitions != null) {
// Gets Segment assignment strategy for instance partitions
segmentAssignmentStrategy = SegmentAssignmentStrategyFactory
.getSegmentAssignmentStrategy(_helixManager, _tableConfig,
InstancePartitionsType.COMPLETED.toString(),
completedInstancePartitions);
}
```
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