kafka RemotePartitionDeleteState 源码
kafka RemotePartitionDeleteState 代码
文件路径:/storage/api/src/main/java/org/apache/kafka/server/log/remote/storage/RemotePartitionDeleteState.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.server.log.remote.storage;
import org.apache.kafka.common.annotation.InterfaceStability;
import java.util.Arrays;
import java.util.Collections;
import java.util.Map;
import java.util.Objects;
import java.util.function.Function;
import java.util.stream.Collectors;
/**
* This enum indicates the deletion state of the remote topic partition. This will be based on the action executed on this
* partition by the remote log service implementation.
* State transitions are mentioned below. Self transition is treated as valid. This allows updating with the
* same state in case of retries and failover.
* <p>
* <PRE>
* +-------------------------+
* |DELETE_PARTITION_MARKED |
* +-----------+-------------+
* |
* |
* +-----------v--------------+
* |DELETE_PARTITION_STARTED |
* +-----------+--------------+
* |
* |
* +-----------v--------------+
* |DELETE_PARTITION_FINISHED |
* +--------------------------+
* </PRE>
* </P>
*/
@InterfaceStability.Evolving
public enum RemotePartitionDeleteState {
/**
* This is used when a topic/partition is marked for delete by the controller.
* That means, all its remote log segments are eligible for deletion so that remote partition removers can
* start deleting them.
*/
DELETE_PARTITION_MARKED((byte) 0),
/**
* This state indicates that the partition deletion is started but not yet finished.
*/
DELETE_PARTITION_STARTED((byte) 1),
/**
* This state indicates that the partition is deleted successfully.
*/
DELETE_PARTITION_FINISHED((byte) 2);
private static final Map<Byte, RemotePartitionDeleteState> STATE_TYPES = Collections.unmodifiableMap(
Arrays.stream(values()).collect(Collectors.toMap(RemotePartitionDeleteState::id, Function.identity())));
private final byte id;
RemotePartitionDeleteState(byte id) {
this.id = id;
}
public byte id() {
return id;
}
public static RemotePartitionDeleteState forId(byte id) {
return STATE_TYPES.get(id);
}
public static boolean isValidTransition(RemotePartitionDeleteState srcState,
RemotePartitionDeleteState targetState) {
Objects.requireNonNull(targetState, "targetState can not be null");
if (srcState == null) {
// If the source state is null, check the target state as the initial state viz DELETE_PARTITION_MARKED.
// This ensures simplicity here as we don't have to define one more type to represent the state 'null' like
// DELETE_PARTITION_NOT_MARKED, have the null check by the caller and pass that state.
return targetState == DELETE_PARTITION_MARKED;
} else if (srcState == targetState) {
// Self transition is treated as valid. This is to maintain the idempotency for the state in case of retries
// or failover.
return true;
} else if (srcState == DELETE_PARTITION_MARKED) {
return targetState == DELETE_PARTITION_STARTED;
} else if (srcState == DELETE_PARTITION_STARTED) {
return targetState == DELETE_PARTITION_FINISHED;
} else {
return false;
}
}
}
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