kafka DescribeReplicaLogDirsResult 源码
kafka DescribeReplicaLogDirsResult 代码
文件路径:/clients/src/main/java/org/apache/kafka/clients/admin/DescribeReplicaLogDirsResult.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.clients.admin;
import org.apache.kafka.common.KafkaFuture;
import org.apache.kafka.common.TopicPartitionReplica;
import org.apache.kafka.common.annotation.InterfaceStability;
import org.apache.kafka.common.requests.DescribeLogDirsResponse;
import java.util.HashMap;
import java.util.Map;
import java.util.Collection;
import java.util.concurrent.ExecutionException;
/**
* The result of {@link Admin#describeReplicaLogDirs(Collection)}.
*
* The API of this class is evolving, see {@link Admin} for details.
*/
@InterfaceStability.Evolving
public class DescribeReplicaLogDirsResult {
private final Map<TopicPartitionReplica, KafkaFuture<ReplicaLogDirInfo>> futures;
DescribeReplicaLogDirsResult(Map<TopicPartitionReplica, KafkaFuture<ReplicaLogDirInfo>> futures) {
this.futures = futures;
}
/**
* Return a map from replica to future which can be used to check the log directory information of individual replicas
*/
public Map<TopicPartitionReplica, KafkaFuture<ReplicaLogDirInfo>> values() {
return futures;
}
/**
* Return a future which succeeds if log directory information of all replicas are available
*/
public KafkaFuture<Map<TopicPartitionReplica, ReplicaLogDirInfo>> all() {
return KafkaFuture.allOf(futures.values().toArray(new KafkaFuture[0])).
thenApply(new KafkaFuture.BaseFunction<Void, Map<TopicPartitionReplica, ReplicaLogDirInfo>>() {
@Override
public Map<TopicPartitionReplica, ReplicaLogDirInfo> apply(Void v) {
Map<TopicPartitionReplica, ReplicaLogDirInfo> replicaLogDirInfos = new HashMap<>();
for (Map.Entry<TopicPartitionReplica, KafkaFuture<ReplicaLogDirInfo>> entry : futures.entrySet()) {
try {
replicaLogDirInfos.put(entry.getKey(), entry.getValue().get());
} catch (InterruptedException | ExecutionException e) {
// This should be unreachable, because allOf ensured that all the futures completed successfully.
throw new RuntimeException(e);
}
}
return replicaLogDirInfos;
}
});
}
static public class ReplicaLogDirInfo {
// The current log directory of the replica of this partition on the given broker.
// Null if no replica is not found for this partition on the given broker.
private final String currentReplicaLogDir;
// Defined as max(HW of partition - LEO of the replica, 0).
private final long currentReplicaOffsetLag;
// The future log directory of the replica of this partition on the given broker.
// Null if the replica of this partition is not being moved to another log directory on the given broker.
private final String futureReplicaLogDir;
// The LEO of the replica - LEO of the future log of this replica in the destination log directory.
// -1 if either there is not replica for this partition or the replica of this partition is not being moved to another log directory on the given broker.
private final long futureReplicaOffsetLag;
ReplicaLogDirInfo() {
this(null, DescribeLogDirsResponse.INVALID_OFFSET_LAG, null, DescribeLogDirsResponse.INVALID_OFFSET_LAG);
}
ReplicaLogDirInfo(String currentReplicaLogDir,
long currentReplicaOffsetLag,
String futureReplicaLogDir,
long futureReplicaOffsetLag) {
this.currentReplicaLogDir = currentReplicaLogDir;
this.currentReplicaOffsetLag = currentReplicaOffsetLag;
this.futureReplicaLogDir = futureReplicaLogDir;
this.futureReplicaOffsetLag = futureReplicaOffsetLag;
}
public String getCurrentReplicaLogDir() {
return currentReplicaLogDir;
}
public long getCurrentReplicaOffsetLag() {
return currentReplicaOffsetLag;
}
public String getFutureReplicaLogDir() {
return futureReplicaLogDir;
}
public long getFutureReplicaOffsetLag() {
return futureReplicaOffsetLag;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
if (futureReplicaLogDir != null) {
builder.append("(currentReplicaLogDir=")
.append(currentReplicaLogDir)
.append(", futureReplicaLogDir=")
.append(futureReplicaLogDir)
.append(", futureReplicaOffsetLag=")
.append(futureReplicaOffsetLag)
.append(")");
} else {
builder.append("ReplicaLogDirInfo(currentReplicaLogDir=").append(currentReplicaLogDir).append(")");
}
return builder.toString();
}
}
}
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