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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.kafka.clients.admin.internals;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.errors.InvalidTopicException;
import org.apache.kafka.common.errors.TopicAuthorizationException;
import org.apache.kafka.common.message.MetadataRequestData;
import org.apache.kafka.common.message.MetadataResponseData;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.requests.AbstractResponse;
import org.apache.kafka.common.requests.MetadataRequest;
import org.apache.kafka.common.requests.MetadataResponse;
import org.apache.kafka.common.utils.LogContext;
import org.slf4j.Logger;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.function.Function;
/**
* Base driver implementation for APIs which target partition leaders.
*/
public class PartitionLeaderStrategy implements AdminApiLookupStrategy {
private static final ApiRequestScope SINGLE_REQUEST_SCOPE = new ApiRequestScope() {
};
private final Logger log;
public PartitionLeaderStrategy(LogContext logContext) {
this.log = logContext.logger(PartitionLeaderStrategy.class);
}
@Override
public ApiRequestScope lookupScope(TopicPartition key) {
// Metadata requests can group topic partitions arbitrarily, so they can all share
// the same request context
return SINGLE_REQUEST_SCOPE;
}
@Override
public MetadataRequest.Builder buildRequest(Set partitions) {
MetadataRequestData request = new MetadataRequestData();
request.setAllowAutoTopicCreation(false);
partitions.stream().map(TopicPartition::topic).distinct().forEach(topic ->
request.topics().add(new MetadataRequestData.MetadataRequestTopic().setName(topic))
);
return new MetadataRequest.Builder(request);
}
private void handleTopicError(
String topic,
Errors topicError,
Set requestPartitions,
Map failed
) {
switch (topicError) {
case UNKNOWN_TOPIC_OR_PARTITION:
case LEADER_NOT_AVAILABLE:
case BROKER_NOT_AVAILABLE:
log.debug("Metadata request for topic {} returned topic-level error {}. Will retry",
topic, topicError);
break;
case TOPIC_AUTHORIZATION_FAILED:
log.error("Received authorization failure for topic {} in `Metadata` response", topic,
topicError.exception());
failAllPartitionsForTopic(topic, requestPartitions, failed, tp -> new TopicAuthorizationException(
"Failed to fetch metadata for partition " + tp + " due to topic authorization failure",
Collections.singleton(topic)));
break;
case INVALID_TOPIC_EXCEPTION:
log.error("Received invalid topic error for topic {} in `Metadata` response", topic,
topicError.exception());
failAllPartitionsForTopic(topic, requestPartitions, failed, tp -> new InvalidTopicException(
"Failed to fetch metadata for partition " + tp + " due to invalid topic `" + topic + "`",
Collections.singleton(topic)));
break;
default:
log.error("Received unexpected error for topic {} in `Metadata` response", topic,
topicError.exception());
failAllPartitionsForTopic(topic, requestPartitions, failed, tp -> topicError.exception(
"Failed to fetch metadata for partition " + tp + " due to unexpected error for topic `" + topic + "`"));
}
}
private void failAllPartitionsForTopic(
String topic,
Set partitions,
Map failed,
Function exceptionGenerator
) {
partitions.stream().filter(tp -> tp.topic().equals(topic)).forEach(tp -> {
failed.put(tp, exceptionGenerator.apply(tp));
});
}
private void handlePartitionError(
TopicPartition topicPartition,
Errors partitionError,
Map failed
) {
switch (partitionError) {
case NOT_LEADER_OR_FOLLOWER:
case REPLICA_NOT_AVAILABLE:
case LEADER_NOT_AVAILABLE:
case BROKER_NOT_AVAILABLE:
case KAFKA_STORAGE_ERROR:
log.debug("Metadata request for partition {} returned partition-level error {}. Will retry",
topicPartition, partitionError);
break;
default:
log.error("Received unexpected error for partition {} in `Metadata` response",
topicPartition, partitionError.exception());
failed.put(topicPartition, partitionError.exception(
"Unexpected error during metadata lookup for " + topicPartition));
}
}
@Override
public LookupResult handleResponse(
Set requestPartitions,
AbstractResponse abstractResponse
) {
MetadataResponse response = (MetadataResponse) abstractResponse;
Map failed = new HashMap<>();
Map mapped = new HashMap<>();
for (MetadataResponseData.MetadataResponseTopic topicMetadata : response.data().topics()) {
String topic = topicMetadata.name();
Errors topicError = Errors.forCode(topicMetadata.errorCode());
if (topicError != Errors.NONE) {
handleTopicError(topic, topicError, requestPartitions, failed);
continue;
}
for (MetadataResponseData.MetadataResponsePartition partitionMetadata : topicMetadata.partitions()) {
TopicPartition topicPartition = new TopicPartition(topic, partitionMetadata.partitionIndex());
Errors partitionError = Errors.forCode(partitionMetadata.errorCode());
if (!requestPartitions.contains(topicPartition)) {
// The `Metadata` response always returns all partitions for requested
// topics, so we have to filter any that we are not interested in.
continue;
}
if (partitionError != Errors.NONE) {
handlePartitionError(topicPartition, partitionError, failed);
continue;
}
int leaderId = partitionMetadata.leaderId();
if (leaderId >= 0) {
mapped.put(topicPartition, leaderId);
} else {
log.debug("Metadata request for {} returned no error, but the leader is unknown. Will retry",
topicPartition);
}
}
}
return new LookupResult<>(failed, mapped);
}
}
