dengziming commented on a change in pull request #9769:
URL: https://github.com/apache/kafka/pull/9769#discussion_r567718317
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File path: core/src/main/scala/kafka/server/KafkaApis.scala
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@@ -1191,8 +1192,35 @@ class KafkaApis(val requestChannel: RequestChannel,
val metadataRequest = request.body[MetadataRequest]
val requestVersion = request.header.apiVersion
+ // Check if topicId is presented firstly.
+ val topicIds = metadataRequest.topicIds.asScala.toSet.filterNot(_ ==
Uuid.ZERO_UUID)
+ val useTopicId = topicIds.nonEmpty
+
+ val (supportedVersionTopicIds, unsupportedVersionTopicIds) = if
(config.interBrokerProtocolVersion >= KAFKA_2_8_IV1)
+ (topicIds, Set.empty[Uuid])
+ else
+ (Set.empty[Uuid], topicIds)
+
+ val unsupportedVersionTopicMetadata = if
(unsupportedVersionTopicIds.isEmpty)
+ Seq.empty[MetadataResponseTopic]
+ else
+ unsupportedVersionTopicIds.map(topicId =>
+ metadataResponseTopic(Errors.UNSUPPORTED_VERSION, null, topicId,
false, util.Collections.emptyList())).toSeq
+
+ // Only get topicIds and topicNames when supporting topicId
+ val unknownTopicIds =
supportedVersionTopicIds.filter(metadataCache.getTopicName(_).isEmpty)
+ val knownTopicNames =
supportedVersionTopicIds.flatMap(metadataCache.getTopicName)
+
+ val unknownTopicIdsTopicMetadata = if (unknownTopicIds.isEmpty)
+ Seq.empty[MetadataResponseTopic]
+ else
+ unknownTopicIds.map(topicId =>
+ metadataResponseTopic(Errors.UNKNOWN_TOPIC_ID, null, topicId, false,
util.Collections.emptyList())).toSeq
+
val topics = if (metadataRequest.isAllTopics)
metadataCache.getAllTopics()
+ else if (useTopicId)
Review comment:
According to KIP-516, we just ignore topic name if a none zero topic id
is provided.
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