AndrewJSchofield commented on code in PR #19917:
URL: https://github.com/apache/kafka/pull/19917#discussion_r2135851674
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/AbstractMembershipManager.java:
##########
@@ -1135,7 +1134,9 @@ CompletableFuture<Void>
revokePartitions(Set<TopicPartition> partitionsToRevoke)
// Ensure the set of partitions to revoke are still assigned
Set<TopicPartition> revokedPartitions = new
HashSet<>(partitionsToRevoke);
revokedPartitions.retainAll(subscriptions.assignedPartitions());
- log.info("Revoking previously assigned partitions {}",
revokedPartitions.stream().map(TopicPartition::toString).collect(Collectors.joining(",
")));
+
+ if (log.isInfoEnabled())
+ log.info("Revoking previously assigned partitions {}",
Utils.sortedTopicPartitions(revokedPartitions));
Review Comment:
This is actually sorting the list of partitions whereas it previously was
not. That seems accidental in a PR that is trying to reduce CPU usage.
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/Utils.java:
##########
@@ -20,12 +20,41 @@
import org.apache.kafka.common.TopicPartition;
import java.io.Serializable;
+import java.util.Collection;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
+import java.util.SortedSet;
+import java.util.TreeSet;
public final class Utils {
+ public static String sortedTopicPartitions(Collection<TopicPartition>
partitions) {
+ SortedSet<TopicPartition> sortedPartitions;
+
+ if (partitions instanceof SortedSet) {
+ sortedPartitions = (SortedSet<TopicPartition>) partitions;
+ } else {
+ sortedPartitions = new TreeSet<>(new TopicPartitionComparator());
+ sortedPartitions.addAll(partitions);
+ }
+
+ return join(sortedPartitions);
+ }
+
+ private static String join(SortedSet<?> elements) {
+ StringBuilder b = new StringBuilder();
Review Comment:
If you constructed an implementation of `Iterator` which executed
`Object.toString()` on its elements, you could then use `String.join` directly.
I wonder what you think about using the Java library to do the string
concatenation.
##########
clients/src/main/java/org/apache/kafka/clients/consumer/internals/TopicMetadataRequestManager.java:
##########
@@ -84,16 +84,21 @@ public TopicMetadataRequestManager(final LogContext
context, final Time time, fi
@Override
public NetworkClientDelegate.PollResult poll(final long currentTimeMs) {
// Prune any requests which have timed out
- List<TopicMetadataRequestState> expiredRequests =
inflightRequests.stream()
- .filter(TimedRequestState::isExpired)
- .collect(Collectors.toList());
+ List<TopicMetadataRequestState> expiredRequests = new ArrayList<>();
+
+ for (TopicMetadataRequestState requestState : inflightRequests) {
+ if (requestState.isExpired())
+ expiredRequests.add(requestState);
+ }
+
expiredRequests.forEach(TopicMetadataRequestState::expire);
Review Comment:
Couldn't you just not build `expiredRequests` and call
`requestState.expire()` at L91?
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