spark DB 源码
spark DB 代码
文件路径：/common/network-common/src/main/java/org/apache/spark/network/shuffledb/DB.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.spark.network.shuffledb;
import java.io.Closeable;
import org.apache.spark.annotation.Private;
/**
* The local KV storage used to persist the shuffle state,
* the implementations may include LevelDB, RocksDB, etc.
*/
@Private
public interface DB extends Closeable {
/**
* Set the DB entry for "key" to "value".
*/
void put(byte[] key, byte[] value);
/**
* Get which returns a new byte array storing the value associated
* with the specified input key if any.
*/
byte[] get(byte[] key);
/**
* Delete the DB entry (if any) for "key".
*/
void delete(byte[] key);
/**
* Return an iterator over the contents of the DB.
*/
DBIterator iterator();
}
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