kafka OffsetFetchResponse 源码
kafka OffsetFetchResponse 代码
文件路径：/clients/src/main/java/org/apache/kafka/common/requests/OffsetFetchResponse.java
/*
* 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 java.util.Map.Entry;
import java.util.stream.Collectors;
import org.apache.kafka.common.TopicPartition;
import org.apache.kafka.common.message.OffsetFetchResponseData;
import org.apache.kafka.common.message.OffsetFetchResponseData.OffsetFetchResponseGroup;
import org.apache.kafka.common.message.OffsetFetchResponseData.OffsetFetchResponsePartition;
import org.apache.kafka.common.message.OffsetFetchResponseData.OffsetFetchResponsePartitions;
import org.apache.kafka.common.message.OffsetFetchResponseData.OffsetFetchResponseTopic;
import org.apache.kafka.common.message.OffsetFetchResponseData.OffsetFetchResponseTopics;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.ByteBufferAccessor;
import org.apache.kafka.common.protocol.Errors;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Optional;
import static org.apache.kafka.common.record.RecordBatch.NO_PARTITION_LEADER_EPOCH;
/**
* Possible error codes:
*
* - Partition errors:
* - {@link Errors#UNKNOWN_TOPIC_OR_PARTITION}
* - {@link Errors#TOPIC_AUTHORIZATION_FAILED}
* - {@link Errors#UNSTABLE_OFFSET_COMMIT}
*
* - Group or coordinator errors:
* - {@link Errors#COORDINATOR_LOAD_IN_PROGRESS}
* - {@link Errors#COORDINATOR_NOT_AVAILABLE}
* - {@link Errors#NOT_COORDINATOR}
* - {@link Errors#GROUP_AUTHORIZATION_FAILED}
*/
public class OffsetFetchResponse extends AbstractResponse {
public static final long INVALID_OFFSET = -1L;
public static final String NO_METADATA = "";
public static final PartitionData UNKNOWN_PARTITION = new PartitionData(INVALID_OFFSET,
Optional.empty(),
NO_METADATA,
Errors.UNKNOWN_TOPIC_OR_PARTITION);
public static final PartitionData UNAUTHORIZED_PARTITION = new PartitionData(INVALID_OFFSET,
Optional.empty(),
NO_METADATA,
Errors.TOPIC_AUTHORIZATION_FAILED);
private static final List<Errors> PARTITION_ERRORS = Arrays.asList(
Errors.UNKNOWN_TOPIC_OR_PARTITION, Errors.TOPIC_AUTHORIZATION_FAILED);
private final OffsetFetchResponseData data;
private final Errors error;
private final Map<String, Errors> groupLevelErrors = new HashMap<>();
public static final class PartitionData {
public final long offset;
public final String metadata;
public final Errors error;
public final Optional<Integer> leaderEpoch;
public PartitionData(long offset,
Optional<Integer> leaderEpoch,
String metadata,
Errors error) {
this.offset = offset;
this.leaderEpoch = leaderEpoch;
this.metadata = metadata;
this.error = error;
}
public boolean hasError() {
return this.error != Errors.NONE;
}
@Override
public boolean equals(Object other) {
if (!(other instanceof PartitionData))
return false;
PartitionData otherPartition = (PartitionData) other;
return Objects.equals(this.offset, otherPartition.offset)
&& Objects.equals(this.leaderEpoch, otherPartition.leaderEpoch)
&& Objects.equals(this.metadata, otherPartition.metadata)
&& Objects.equals(this.error, otherPartition.error);
}
@Override
public String toString() {
return "PartitionData("
+ "offset=" + offset
+ ", leaderEpoch=" + leaderEpoch.orElse(NO_PARTITION_LEADER_EPOCH)
+ ", metadata=" + metadata
+ ", error='" + error.toString()
+ ")";
}
@Override
public int hashCode() {
return Objects.hash(offset, leaderEpoch, metadata, error);
}
}
public OffsetFetchResponse(OffsetFetchResponseData data) {
super(ApiKeys.OFFSET_FETCH);
this.data = data;
this.error = null;
}
/**
* Constructor without throttle time.
* @param error Potential coordinator or group level error code (for api version 2 and later)
* @param responseData Fetched offset information grouped by topic-partition
*/
public OffsetFetchResponse(Errors error, Map<TopicPartition, PartitionData> responseData) {
this(DEFAULT_THROTTLE_TIME, error, responseData);
}
/**
* Constructor with throttle time for version 0 to 7
* @param throttleTimeMs The time in milliseconds that this response was throttled
* @param error Potential coordinator or group level error code (for api version 2 and later)
* @param responseData Fetched offset information grouped by topic-partition
*/
public OffsetFetchResponse(int throttleTimeMs, Errors error, Map<TopicPartition, PartitionData> responseData) {
super(ApiKeys.OFFSET_FETCH);
Map<String, OffsetFetchResponseTopic> offsetFetchResponseTopicMap = new HashMap<>();
for (Map.Entry<TopicPartition, PartitionData> entry : responseData.entrySet()) {
String topicName = entry.getKey().topic();
OffsetFetchResponseTopic topic = offsetFetchResponseTopicMap.getOrDefault(
topicName, new OffsetFetchResponseTopic().setName(topicName));
PartitionData partitionData = entry.getValue();
topic.partitions().add(new OffsetFetchResponsePartition()
.setPartitionIndex(entry.getKey().partition())
.setErrorCode(partitionData.error.code())
.setCommittedOffset(partitionData.offset)
.setCommittedLeaderEpoch(
partitionData.leaderEpoch.orElse(NO_PARTITION_LEADER_EPOCH))
.setMetadata(partitionData.metadata)
);
offsetFetchResponseTopicMap.put(topicName, topic);
}
this.data = new OffsetFetchResponseData()
.setTopics(new ArrayList<>(offsetFetchResponseTopicMap.values()))
.setErrorCode(error.code())
.setThrottleTimeMs(throttleTimeMs);
this.error = error;
}
/**
* Constructor with throttle time for version 8 and above.
* @param throttleTimeMs The time in milliseconds that this response was throttled
* @param errors Potential coordinator or group level error code
* @param responseData Fetched offset information grouped by topic-partition and by group
*/
public OffsetFetchResponse(int throttleTimeMs,
Map<String, Errors> errors,
Map<String, Map<TopicPartition, PartitionData>> responseData) {
super(ApiKeys.OFFSET_FETCH);
List<OffsetFetchResponseGroup> groupList = new ArrayList<>();
for (Entry<String, Map<TopicPartition, PartitionData>> entry : responseData.entrySet()) {
String groupName = entry.getKey();
Map<TopicPartition, PartitionData> partitionDataMap = entry.getValue();
Map<String, OffsetFetchResponseTopics> offsetFetchResponseTopicsMap = new HashMap<>();
for (Entry<TopicPartition, PartitionData> partitionEntry : partitionDataMap.entrySet()) {
String topicName = partitionEntry.getKey().topic();
OffsetFetchResponseTopics topic =
offsetFetchResponseTopicsMap.getOrDefault(topicName,
new OffsetFetchResponseTopics().setName(topicName));
PartitionData partitionData = partitionEntry.getValue();
topic.partitions().add(new OffsetFetchResponsePartitions()
.setPartitionIndex(partitionEntry.getKey().partition())
.setErrorCode(partitionData.error.code())
.setCommittedOffset(partitionData.offset)
.setCommittedLeaderEpoch(
partitionData.leaderEpoch.orElse(NO_PARTITION_LEADER_EPOCH))
.setMetadata(partitionData.metadata));
offsetFetchResponseTopicsMap.put(topicName, topic);
}
groupList.add(new OffsetFetchResponseGroup()
.setGroupId(groupName)
.setTopics(new ArrayList<>(offsetFetchResponseTopicsMap.values()))
.setErrorCode(errors.get(groupName).code()));
groupLevelErrors.put(groupName, errors.get(groupName));
}
this.data = new OffsetFetchResponseData()
.setGroups(groupList)
.setThrottleTimeMs(throttleTimeMs);
this.error = null;
}
public OffsetFetchResponse(OffsetFetchResponseData data, short version) {
super(ApiKeys.OFFSET_FETCH);
this.data = data;
// for version 2 and later use the top-level error code (in ERROR_CODE_KEY_NAME) from the response.
// for older versions there is no top-level error in the response and all errors are partition errors,
// so if there is a group or coordinator error at the partition level use that as the top-level error.
// this way clients can depend on the top-level error regardless of the offset fetch version.
// we return the error differently starting with version 8, so we will only populate the
// error field if we are between version 2 and 7. if we are in version 8 or greater, then
// we will populate the map of group id to error codes.
if (version < 8) {
this.error = version >= 2 ? Errors.forCode(data.errorCode()) : topLevelError(data);
} else {
for (OffsetFetchResponseGroup group : data.groups()) {
this.groupLevelErrors.put(group.groupId(), Errors.forCode(group.errorCode()));
}
this.error = null;
}
}
private static Errors topLevelError(OffsetFetchResponseData data) {
for (OffsetFetchResponseTopic topic : data.topics()) {
for (OffsetFetchResponsePartition partition : topic.partitions()) {
Errors partitionError = Errors.forCode(partition.errorCode());
if (partitionError != Errors.NONE && !PARTITION_ERRORS.contains(partitionError)) {
return partitionError;
}
}
}
return Errors.NONE;
}
@Override
public int throttleTimeMs() {
return data.throttleTimeMs();
}
@Override
public void maybeSetThrottleTimeMs(int throttleTimeMs) {
data.setThrottleTimeMs(throttleTimeMs);
}
public boolean hasError() {
return error != Errors.NONE;
}
public boolean groupHasError(String groupId) {
Errors error = groupLevelErrors.get(groupId);
if (error == null) {
return this.error != null && this.error != Errors.NONE;
}
return error != Errors.NONE;
}
public Errors error() {
return error;
}
public Errors groupLevelError(String groupId) {
if (error != null) {
return error;
}
return groupLevelErrors.get(groupId);
}
@Override
public Map<Errors, Integer> errorCounts() {
Map<Errors, Integer> counts = new HashMap<>();
if (!groupLevelErrors.isEmpty()) {
// built response with v8 or above
for (Map.Entry<String, Errors> entry : groupLevelErrors.entrySet()) {
updateErrorCounts(counts, entry.getValue());
}
for (OffsetFetchResponseGroup group : data.groups()) {
group.topics().forEach(topic ->
topic.partitions().forEach(partition ->
updateErrorCounts(counts, Errors.forCode(partition.errorCode()))));
}
} else {
// built response with v0-v7
updateErrorCounts(counts, error);
data.topics().forEach(topic ->
topic.partitions().forEach(partition ->
updateErrorCounts(counts, Errors.forCode(partition.errorCode()))));
}
return counts;
}
// package-private for testing purposes
Map<TopicPartition, PartitionData> responseDataV0ToV7() {
Map<TopicPartition, PartitionData> responseData = new HashMap<>();
for (OffsetFetchResponseTopic topic : data.topics()) {
for (OffsetFetchResponsePartition partition : topic.partitions()) {
responseData.put(new TopicPartition(topic.name(), partition.partitionIndex()),
new PartitionData(partition.committedOffset(),
RequestUtils.getLeaderEpoch(partition.committedLeaderEpoch()),
partition.metadata(),
Errors.forCode(partition.errorCode()))
);
}
}
return responseData;
}
private Map<TopicPartition, PartitionData> buildResponseData(String groupId) {
Map<TopicPartition, PartitionData> responseData = new HashMap<>();
OffsetFetchResponseGroup group = data
.groups()
.stream()
.filter(g -> g.groupId().equals(groupId))
.collect(Collectors.toList())
.get(0);
for (OffsetFetchResponseTopics topic : group.topics()) {
for (OffsetFetchResponsePartitions partition : topic.partitions()) {
responseData.put(new TopicPartition(topic.name(), partition.partitionIndex()),
new PartitionData(partition.committedOffset(),
RequestUtils.getLeaderEpoch(partition.committedLeaderEpoch()),
partition.metadata(),
Errors.forCode(partition.errorCode()))
);
}
}
return responseData;
}
public Map<TopicPartition, PartitionData> partitionDataMap(String groupId) {
if (groupLevelErrors.isEmpty()) {
return responseDataV0ToV7();
}
return buildResponseData(groupId);
}
public static OffsetFetchResponse parse(ByteBuffer buffer, short version) {
return new OffsetFetchResponse(new OffsetFetchResponseData(new ByteBufferAccessor(buffer), version), version);
}
@Override
public OffsetFetchResponseData data() {
return data;
}
@Override
public boolean shouldClientThrottle(short version) {
return version >= 4;
}
}
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