org.apache.kafka.common.requests.MetadataResponse Maven / Gradle / Ivy
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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.Cluster;
import org.apache.kafka.common.Node;
import org.apache.kafka.common.PartitionInfo;
import org.apache.kafka.common.protocol.ApiKeys;
import org.apache.kafka.common.protocol.Errors;
import org.apache.kafka.common.protocol.ProtoUtils;
import org.apache.kafka.common.protocol.types.Struct;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class MetadataResponse extends AbstractRequestResponse {
private static final short CURRENT_VERSION = ProtoUtils.latestVersion(ApiKeys.METADATA.id);
private static final String BROKERS_KEY_NAME = "brokers";
private static final String TOPIC_METADATA_KEY_NAME = "topic_metadata";
// broker level field names
private static final String NODE_ID_KEY_NAME = "node_id";
private static final String HOST_KEY_NAME = "host";
private static final String PORT_KEY_NAME = "port";
private static final String RACK_KEY_NAME = "rack";
private static final String CONTROLLER_ID_KEY_NAME = "controller_id";
public static final int NO_CONTROLLER_ID = -1;
// topic level field names
private static final String TOPIC_ERROR_CODE_KEY_NAME = "topic_error_code";
/**
* Possible error codes:
*
* UnknownTopic (3)
* LeaderNotAvailable (5)
* InvalidTopic (17)
* TopicAuthorizationFailed (29)
*/
private static final String TOPIC_KEY_NAME = "topic";
private static final String IS_INTERNAL_KEY_NAME = "is_internal";
private static final String PARTITION_METADATA_KEY_NAME = "partition_metadata";
// partition level field names
private static final String PARTITION_ERROR_CODE_KEY_NAME = "partition_error_code";
/**
* Possible error codes:
*
* LeaderNotAvailable (5)
* ReplicaNotAvailable (9)
*/
private static final String PARTITION_KEY_NAME = "partition_id";
private static final String LEADER_KEY_NAME = "leader";
private static final String REPLICAS_KEY_NAME = "replicas";
private static final String ISR_KEY_NAME = "isr";
private final Collection brokers;
private final Node controller;
private final List topicMetadata;
/**
* Constructor for the latest version
*/
public MetadataResponse(List brokers, int controllerId, List topicMetadata) {
this(brokers, controllerId, topicMetadata, CURRENT_VERSION);
}
/**
* Constructor for a specific version
*/
public MetadataResponse(List brokers, int controllerId, List topicMetadata, int version) {
super(new Struct(ProtoUtils.responseSchema(ApiKeys.METADATA.id, version)));
this.brokers = brokers;
this.controller = getControllerNode(controllerId, brokers);
this.topicMetadata = topicMetadata;
List brokerArray = new ArrayList<>();
for (Node node : brokers) {
Struct broker = struct.instance(BROKERS_KEY_NAME);
broker.set(NODE_ID_KEY_NAME, node.id());
broker.set(HOST_KEY_NAME, node.host());
broker.set(PORT_KEY_NAME, node.port());
// This field only exists in v1+
if (broker.hasField(RACK_KEY_NAME))
broker.set(RACK_KEY_NAME, node.rack());
brokerArray.add(broker);
}
struct.set(BROKERS_KEY_NAME, brokerArray.toArray());
// This field only exists in v1+
if (struct.hasField(CONTROLLER_ID_KEY_NAME))
struct.set(CONTROLLER_ID_KEY_NAME, controllerId);
List topicMetadataArray = new ArrayList<>(topicMetadata.size());
for (TopicMetadata metadata : topicMetadata) {
Struct topicData = struct.instance(TOPIC_METADATA_KEY_NAME);
topicData.set(TOPIC_KEY_NAME, metadata.topic);
topicData.set(TOPIC_ERROR_CODE_KEY_NAME, metadata.error.code());
// This field only exists in v1+
if (topicData.hasField(IS_INTERNAL_KEY_NAME))
topicData.set(IS_INTERNAL_KEY_NAME, metadata.isInternal());
List partitionMetadataArray = new ArrayList<>(metadata.partitionMetadata.size());
for (PartitionMetadata partitionMetadata : metadata.partitionMetadata()) {
Struct partitionData = topicData.instance(PARTITION_METADATA_KEY_NAME);
partitionData.set(PARTITION_ERROR_CODE_KEY_NAME, partitionMetadata.error.code());
partitionData.set(PARTITION_KEY_NAME, partitionMetadata.partition);
partitionData.set(LEADER_KEY_NAME, partitionMetadata.leader.id());
ArrayList replicas = new ArrayList<>(partitionMetadata.replicas.size());
for (Node node : partitionMetadata.replicas)
replicas.add(node.id());
partitionData.set(REPLICAS_KEY_NAME, replicas.toArray());
ArrayList isr = new ArrayList<>(partitionMetadata.isr.size());
for (Node node : partitionMetadata.isr)
isr.add(node.id());
partitionData.set(ISR_KEY_NAME, isr.toArray());
partitionMetadataArray.add(partitionData);
}
topicData.set(PARTITION_METADATA_KEY_NAME, partitionMetadataArray.toArray());
topicMetadataArray.add(topicData);
}
struct.set(TOPIC_METADATA_KEY_NAME, topicMetadataArray.toArray());
}
public MetadataResponse(Struct struct) {
super(struct);
Map brokers = new HashMap<>();
Object[] brokerStructs = (Object[]) struct.get(BROKERS_KEY_NAME);
for (int i = 0; i < brokerStructs.length; i++) {
Struct broker = (Struct) brokerStructs[i];
int nodeId = broker.getInt(NODE_ID_KEY_NAME);
String host = broker.getString(HOST_KEY_NAME);
int port = broker.getInt(PORT_KEY_NAME);
// This field only exists in v1+
// When we can't know if a rack exists in a v0 response we default to null
String rack = broker.hasField(RACK_KEY_NAME) ? broker.getString(RACK_KEY_NAME) : null;
brokers.put(nodeId, new Node(nodeId, host, port, rack));
}
// This field only exists in v1+
// When we can't know the controller id in a v0 response we default to NO_CONTROLLER_ID
int controllerId = NO_CONTROLLER_ID;
if (struct.hasField(CONTROLLER_ID_KEY_NAME))
controllerId = struct.getInt(CONTROLLER_ID_KEY_NAME);
List topicMetadata = new ArrayList<>();
Object[] topicInfos = (Object[]) struct.get(TOPIC_METADATA_KEY_NAME);
for (int i = 0; i < topicInfos.length; i++) {
Struct topicInfo = (Struct) topicInfos[i];
Errors topicError = Errors.forCode(topicInfo.getShort(TOPIC_ERROR_CODE_KEY_NAME));
String topic = topicInfo.getString(TOPIC_KEY_NAME);
// This field only exists in v1+
// When we can't know if a topic is internal or not in a v0 response we default to false
boolean isInternal = topicInfo.hasField(IS_INTERNAL_KEY_NAME) ? topicInfo.getBoolean(IS_INTERNAL_KEY_NAME) : false;
List partitionMetadata = new ArrayList<>();
Object[] partitionInfos = (Object[]) topicInfo.get(PARTITION_METADATA_KEY_NAME);
for (int j = 0; j < partitionInfos.length; j++) {
Struct partitionInfo = (Struct) partitionInfos[j];
Errors partitionError = Errors.forCode(partitionInfo.getShort(PARTITION_ERROR_CODE_KEY_NAME));
int partition = partitionInfo.getInt(PARTITION_KEY_NAME);
int leader = partitionInfo.getInt(LEADER_KEY_NAME);
Node leaderNode = leader == -1 ? null : brokers.get(leader);
Object[] replicas = (Object[]) partitionInfo.get(REPLICAS_KEY_NAME);
List replicaNodes = new ArrayList<>(replicas.length);
for (Object replicaNodeId : replicas)
if (brokers.containsKey(replicaNodeId))
replicaNodes.add(brokers.get(replicaNodeId));
else
replicaNodes.add(new Node((int) replicaNodeId, "", -1));
Object[] isr = (Object[]) partitionInfo.get(ISR_KEY_NAME);
List isrNodes = new ArrayList<>(isr.length);
for (Object isrNode : isr)
if (brokers.containsKey(isrNode))
isrNodes.add(brokers.get(isrNode));
else
isrNodes.add(new Node((int) isrNode, "", -1));
partitionMetadata.add(new PartitionMetadata(partitionError, partition, leaderNode, replicaNodes, isrNodes));
}
topicMetadata.add(new TopicMetadata(topicError, topic, isInternal, partitionMetadata));
}
this.brokers = brokers.values();
this.controller = getControllerNode(controllerId, brokers.values());
this.topicMetadata = topicMetadata;
}
private Node getControllerNode(int controllerId, Collection brokers) {
for (Node broker : brokers) {
if (broker.id() == controllerId)
return broker;
}
return null;
}
/**
* Get a map of the topics which had metadata errors
* @return the map
*/
public Map errors() {
Map errors = new HashMap<>();
for (TopicMetadata metadata : topicMetadata) {
if (metadata.error != Errors.NONE)
errors.put(metadata.topic(), metadata.error);
}
return errors;
}
/**
* Get a snapshot of the cluster metadata from this response
* @return the cluster snapshot
*/
public Cluster cluster() {
Set unauthorizedTopics = new HashSet<>();
List partitions = new ArrayList<>();
for (TopicMetadata metadata : topicMetadata) {
if (metadata.error == Errors.NONE) {
for (PartitionMetadata partitionMetadata : metadata.partitionMetadata)
partitions.add(new PartitionInfo(
metadata.topic,
partitionMetadata.partition,
partitionMetadata.leader,
partitionMetadata.replicas.toArray(new Node[0]),
partitionMetadata.isr.toArray(new Node[0])));
} else if (metadata.error == Errors.TOPIC_AUTHORIZATION_FAILED) {
unauthorizedTopics.add(metadata.topic);
}
}
return new Cluster(this.brokers, partitions, unauthorizedTopics);
}
/**
* Get all brokers returned in metadata response
* @return the brokers
*/
public Collection brokers() {
return brokers;
}
/**
* Get all topic metadata returned in the metadata response
* @return the topicMetadata
*/
public Collection topicMetadata() {
return topicMetadata;
}
/**
* The controller node returned in metadata response
* @return the controller node or null if it doesn't exist
*/
public Node controller() {
return controller;
}
public static MetadataResponse parse(ByteBuffer buffer) {
return parse(buffer, CURRENT_VERSION);
}
public static MetadataResponse parse(ByteBuffer buffer, int version) {
return new MetadataResponse(ProtoUtils.responseSchema(ApiKeys.METADATA.id, version).read(buffer));
}
public static class TopicMetadata {
private final Errors error;
private final String topic;
private final boolean isInternal;
private final List partitionMetadata;
public TopicMetadata(Errors error,
String topic,
boolean isInternal,
List partitionMetadata) {
this.error = error;
this.topic = topic;
this.isInternal = isInternal;
this.partitionMetadata = partitionMetadata;
}
public Errors error() {
return error;
}
public String topic() {
return topic;
}
public boolean isInternal() {
return isInternal;
}
public List partitionMetadata() {
return partitionMetadata;
}
}
public static class PartitionMetadata {
private final Errors error;
private final int partition;
private final Node leader;
private final List replicas;
private final List isr;
public PartitionMetadata(Errors error,
int partition,
Node leader,
List replicas,
List isr) {
this.error = error;
this.partition = partition;
this.leader = leader;
this.replicas = replicas;
this.isr = isr;
}
public Errors error() {
return error;
}
public int partition() {
return partition;
}
public Node leader() {
return leader;
}
public List replicas() {
return replicas;
}
public List isr() {
return isr;
}
}
}
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