dajac commented on a change in pull request #11331:
URL: https://github.com/apache/kafka/pull/11331#discussion_r743041695
##########
File path:
clients/src/main/java/org/apache/kafka/clients/FetchSessionHandler.java
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@@ -285,52 +268,57 @@ public FetchRequestData build() {
if (nextMetadata.isFull()) {
if (log.isDebugEnabled()) {
log.debug("Built full fetch {} for node {} with {}.",
- nextMetadata, node,
partitionsToLogString(next.keySet()));
+ nextMetadata, node,
topicPartitionsToLogString(next.keySet()));
}
sessionPartitions = next;
next = null;
+ Map<TopicPartition, PartitionData> toSend =
+ Collections.unmodifiableMap(new
LinkedHashMap<>(sessionPartitions));
// Only add topic IDs to the session if we are using topic IDs.
if (canUseTopicIds) {
- sessionTopicIds = topicIds;
- sessionTopicNames = new HashMap<>(topicIds.size());
- topicIds.forEach((name, id) -> sessionTopicNames.put(id,
name));
+ Map<Uuid, Set<String>> newTopicNames =
sessionPartitions.entrySet().stream().collect(Collectors.groupingByConcurrent(entry
-> entry.getValue().topicId,
+ Collectors.mapping(entry ->
entry.getKey().topic(), Collectors.toSet())));
Review comment:
I think that the grouping is slower because it has to allocate another
Map, Sets for each Uuid, etc.
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