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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.common.requests;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.protocol.types.Field;
import org.apache.kafka.common.protocol.types.Schema;
import org.apache.kafka.common.protocol.types.Struct;
import org.apache.kafka.common.record.RecordBatch;
import org.apache.kafka.common.utils.CollectionUtils;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import static org.apache.kafka.common.protocol.CommonFields.ERROR_CODE;
import static org.apache.kafka.common.protocol.CommonFields.LEADER_EPOCH;
import static org.apache.kafka.common.protocol.CommonFields.PARTITION_ID;
import static org.apache.kafka.common.protocol.CommonFields.THROTTLE_TIME_MS;
import static org.apache.kafka.common.protocol.CommonFields.TOPIC_NAME;
/**
* Possible error codes:
*
* - {@link Errors#TOPIC_AUTHORIZATION_FAILED} If the user does not have DESCRIBE access to a requested topic
* - {@link Errors#REPLICA_NOT_AVAILABLE} If the request is received by a broker which is not a replica
* - {@link Errors#NOT_LEADER_FOR_PARTITION} If the broker is not a leader and either the provided leader epoch
* matches the known leader epoch on the broker or is empty
* - {@link Errors#FENCED_LEADER_EPOCH} If the epoch is lower than the broker's epoch
* - {@link Errors#UNKNOWN_LEADER_EPOCH} If the epoch is larger than the broker's epoch
* - {@link Errors#UNKNOWN_TOPIC_OR_PARTITION} If the broker does not have metadata for a topic or partition
* - {@link Errors#KAFKA_STORAGE_ERROR} If the log directory for one of the requested partitions is offline
* - {@link Errors#UNKNOWN_SERVER_ERROR} For any unexpected errors
*/
public class OffsetsForLeaderEpochResponse extends AbstractResponse {
private static final Field.ComplexArray TOPICS = new Field.ComplexArray("topics",
"An array of topics for which we have leader offsets for some requested partition leader epoch");
private static final Field.ComplexArray PARTITIONS = new Field.ComplexArray("partitions",
"An array of offsets by partition");
private static final Field.Int64 END_OFFSET = new Field.Int64("end_offset", "The end offset");
private static final Field PARTITIONS_V0 = PARTITIONS.withFields(
ERROR_CODE,
PARTITION_ID,
END_OFFSET);
private static final Field TOPICS_V0 = TOPICS.withFields(
TOPIC_NAME,
PARTITIONS_V0);
private static final Schema OFFSET_FOR_LEADER_EPOCH_RESPONSE_V0 = new Schema(
TOPICS_V0);
// V1 added a per-partition leader epoch field which specifies which leader epoch the end offset belongs to
private static final Field PARTITIONS_V1 = PARTITIONS.withFields(
ERROR_CODE,
PARTITION_ID,
LEADER_EPOCH,
END_OFFSET);
private static final Field TOPICS_V1 = TOPICS.withFields(
TOPIC_NAME,
PARTITIONS_V1);
private static final Schema OFFSET_FOR_LEADER_EPOCH_RESPONSE_V1 = new Schema(
TOPICS_V1);
// V2 bumped for addition of current leader epoch to the request schema and the addition of the throttle
// time in the response
private static final Schema OFFSET_FOR_LEADER_EPOCH_RESPONSE_V2 = new Schema(
THROTTLE_TIME_MS,
TOPICS_V1);
private static final Schema OFFSET_FOR_LEADER_EPOCH_RESPONSE_V3 = OFFSET_FOR_LEADER_EPOCH_RESPONSE_V2;
public static Schema[] schemaVersions() {
return new Schema[]{OFFSET_FOR_LEADER_EPOCH_RESPONSE_V0, OFFSET_FOR_LEADER_EPOCH_RESPONSE_V1,
OFFSET_FOR_LEADER_EPOCH_RESPONSE_V2, OFFSET_FOR_LEADER_EPOCH_RESPONSE_V3};
}
private final int throttleTimeMs;
private final Map epochEndOffsetsByPartition;
public OffsetsForLeaderEpochResponse(Struct struct) {
this.throttleTimeMs = struct.getOrElse(THROTTLE_TIME_MS, DEFAULT_THROTTLE_TIME);
this.epochEndOffsetsByPartition = new HashMap<>();
for (Object topicAndEpocsObj : struct.get(TOPICS)) {
Struct topicAndEpochs = (Struct) topicAndEpocsObj;
String topic = topicAndEpochs.get(TOPIC_NAME);
for (Object partitionAndEpochObj : topicAndEpochs.get(PARTITIONS)) {
Struct partitionAndEpoch = (Struct) partitionAndEpochObj;
Errors error = Errors.forCode(partitionAndEpoch.get(ERROR_CODE));
int partitionId = partitionAndEpoch.get(PARTITION_ID);
TopicPartition tp = new TopicPartition(topic, partitionId);
int leaderEpoch = partitionAndEpoch.getOrElse(LEADER_EPOCH, RecordBatch.NO_PARTITION_LEADER_EPOCH);
long endOffset = partitionAndEpoch.get(END_OFFSET);
epochEndOffsetsByPartition.put(tp, new EpochEndOffset(error, leaderEpoch, endOffset));
}
}
}
public OffsetsForLeaderEpochResponse(Map epochsByTopic) {
this(DEFAULT_THROTTLE_TIME, epochsByTopic);
}
public OffsetsForLeaderEpochResponse(int throttleTimeMs, Map epochsByTopic) {
this.throttleTimeMs = throttleTimeMs;
this.epochEndOffsetsByPartition = epochsByTopic;
}
public Map responses() {
return epochEndOffsetsByPartition;
}
@Override
public Map errorCounts() {
Map errorCounts = new HashMap<>();
for (EpochEndOffset response : epochEndOffsetsByPartition.values())
updateErrorCounts(errorCounts, response.error());
return errorCounts;
}
public int throttleTimeMs() {
return throttleTimeMs;
}
public static OffsetsForLeaderEpochResponse parse(ByteBuffer buffer, short versionId) {
return new OffsetsForLeaderEpochResponse(ApiKeys.OFFSET_FOR_LEADER_EPOCH.responseSchema(versionId).read(buffer));
}
@Override
protected Struct toStruct(short version) {
Struct responseStruct = new Struct(ApiKeys.OFFSET_FOR_LEADER_EPOCH.responseSchema(version));
responseStruct.setIfExists(THROTTLE_TIME_MS, throttleTimeMs);
Map> endOffsetsByTopic = CollectionUtils.groupPartitionDataByTopic(epochEndOffsetsByPartition);
List topics = new ArrayList<>(endOffsetsByTopic.size());
for (Map.Entry> topicToPartitionEpochs : endOffsetsByTopic.entrySet()) {
Struct topicStruct = responseStruct.instance(TOPICS);
topicStruct.set(TOPIC_NAME, topicToPartitionEpochs.getKey());
Map partitionEpochs = topicToPartitionEpochs.getValue();
List partitions = new ArrayList<>();
for (Map.Entry partitionEndOffset : partitionEpochs.entrySet()) {
Struct partitionStruct = topicStruct.instance(PARTITIONS);
partitionStruct.set(ERROR_CODE, partitionEndOffset.getValue().error().code());
partitionStruct.set(PARTITION_ID, partitionEndOffset.getKey());
partitionStruct.setIfExists(LEADER_EPOCH, partitionEndOffset.getValue().leaderEpoch());
partitionStruct.set(END_OFFSET, partitionEndOffset.getValue().endOffset());
partitions.add(partitionStruct);
}
topicStruct.set(PARTITIONS, partitions.toArray());
topics.add(topicStruct);
}
responseStruct.set(TOPICS, topics.toArray());
return responseStruct;
}
@Override
public String toString() {
StringBuilder bld = new StringBuilder();
bld.append("(type=OffsetsForLeaderEpochResponse, ")
.append(", throttleTimeMs=").append(throttleTimeMs)
.append(", epochEndOffsetsByPartition=").append(epochEndOffsetsByPartition)
.append(")");
return bld.toString();
}
}
