praveenc7 commented on code in PR #13952:
URL: https://github.com/apache/pinot/pull/13952#discussion_r1755761361
##########
pinot-broker/src/main/java/org/apache/pinot/broker/routing/instanceselector/ReplicaGroupInstanceSelector.java:
##########
@@ -135,37 +137,30 @@ private Pair<Map<String, String>, Map<String, String>>
selectServersUsingRoundRo
}
private Pair<Map<String, String>, Map<String, String>>
selectServersUsingAdaptiveServerSelector(List<String> segments,
- int requestId, SegmentStates segmentStates, List<String> serverRankList)
{
+ int requestId, SegmentStates segmentStates, Map<String, Integer>
serverRankMap) {
Map<String, String> segmentToSelectedInstanceMap = new
HashMap<>(HashUtil.getHashMapCapacity(segments.size()));
// No need to adjust this map per total segment numbers, as optional
segments should be empty most of the time.
Map<String, String> optionalSegmentToInstanceMap = new HashMap<>();
- for (String segment : segments) {
+ segments.forEach(segment -> {
// NOTE: candidates can be null when there is no enabled instances for
the segment, or the instance selector has
// not been updated (we update all components for routing in sequence)
List<SegmentInstanceCandidate> candidates =
segmentStates.getCandidates(segment);
if (candidates == null) {
- continue;
+ return; // continue to the next iteration
}
- // Round Robin.
- int numCandidates = candidates.size();
- int instanceIdx = requestId % numCandidates;
- SegmentInstanceCandidate selectedInstance = candidates.get(instanceIdx);
- // Adaptive Server Selection
- // TODO: Support numReplicaGroupsToQuery with Adaptive Server Selection.
- if (!serverRankList.isEmpty()) {
- int minIdx = Integer.MAX_VALUE;
- for (SegmentInstanceCandidate candidate : candidates) {
- int idx = serverRankList.indexOf(candidate.getInstance());
- if (idx == -1) {
- // Let's use the round-robin approach until stats for all servers
are populated.
- selectedInstance = candidates.get(instanceIdx);
- break;
- }
- if (idx < minIdx) {
- minIdx = idx;
- selectedInstance = candidate;
- }
- }
+
+ // Round Robin selection
+ int roundRobinInstanceIdx = requestId % candidates.size();
+ SegmentInstanceCandidate selectedInstance =
candidates.get(roundRobinInstanceIdx);
+
+ // Adaptive Server Selection logic
+ if (!serverRankMap.isEmpty()) {
+ // Use instance with the best rank if all servers have stats
populated, if not use round-robin selected instance
+ selectedInstance = candidates.stream()
+ .filter(candidate ->
serverRankMap.containsKey(candidate.getInstance()))
+ .min(Comparator.comparingInt(candidate ->
+ serverRankMap.getOrDefault(candidate.getInstance(),
Integer.MAX_VALUE)))
+ .orElse(candidates.get(roundRobinInstanceIdx));
Review Comment:
Right, fixed it.
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