CalvinConfluent commented on code in PR #14612:
URL: https://github.com/apache/kafka/pull/14612#discussion_r1448300548
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core/src/main/scala/kafka/server/metadata/KRaftMetadataCache.scala:
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@@ -189,6 +255,86 @@ class KRaftMetadataCache(val brokerId: Int) extends
MetadataCache with Logging w
}
}
+ /**
+ * Get the topic metadata for the given topics.
+ *
+ * The quota is used to limit the number of partitions to return. The
NextTopicPartition field points to the first
+ * partition can't be returned due the limit.
+ * If a topic can't return any partition due to quota limit reached, this
topic will not be included in the response.
+ *
+ * Note, the topics should be sorted in alphabetical order. The topics in
the DescribeTopicPartitionsResponseData
+ * will also be sorted in alphabetical order.
+ *
+ * @param topics The set of topics and their
corresponding first partition id to fetch.
+ * @param listenerName The listener name.
+ * @param firstTopicPartitionStartIndex The start partition index for the
first topic
+ * @param maximumNumberOfPartitions The max number of partitions to
return.
+ */
+ def getTopicMetadataForDescribeTopicResponse(
+ topics: Seq[String],
+ listenerName: ListenerName,
+ firstTopicPartitionStartIndex: Int,
+ maximumNumberOfPartitions: Int
+ ): DescribeTopicPartitionsResponseData = {
+ val image = _currentImage
+ var remaining = maximumNumberOfPartitions
+ var startIndex = firstTopicPartitionStartIndex
+ val result = new DescribeTopicPartitionsResponseData()
+ topics.foreach { topicName =>
+ if (remaining > 0) {
+ val partitionResponse =
getPartitionMetadataForDescribeTopicResponse(image, topicName, listenerName)
+ partitionResponse.map( partitions => {
+ val upperIndex = startIndex + remaining
+ val response = new DescribeTopicPartitionsResponseTopic()
+ .setErrorCode(Errors.NONE.code)
+ .setName(topicName)
+
.setTopicId(Option(image.topics().getTopic(topicName).id()).getOrElse(Uuid.ZERO_UUID))
+ .setIsInternal(Topic.isInternal(topicName))
+ .setPartitions(partitions.filter(partition => {
+ partition.partitionIndex() >= startIndex &&
partition.partitionIndex() < upperIndex
+ }).asJava)
+ remaining -= response.partitions().size()
+ result.topics().add(response)
+
+ if (upperIndex < partitions.size) {
+ result.setNextCursor(new Cursor()
+ .setTopicName(topicName)
+ .setPartitionIndex(upperIndex)
+ )
+ remaining = -1
+ }
+ })
+
+ // start index only applies to the first topic. Reset it here.
+ startIndex = 0
+
+ if (!partitionResponse.isDefined) {
+ val error = try {
+ Topic.validate(topicName)
+ Errors.UNKNOWN_TOPIC_OR_PARTITION
Review Comment:
Yes, the cursor topic can be deleted.
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