hadoop VectoredIOContext 源码
haddop VectoredIOContext 代码
文件路径：/hadoop-tools/hadoop-aws/src/main/java/org/apache/hadoop/fs/s3a/VectoredIOContext.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.hadoop.fs.s3a;
import java.util.List;
import java.util.function.IntFunction;
/**
* Context related to vectored IO operation.
* See {@link S3AInputStream#readVectored(List, IntFunction)}.
*/
public class VectoredIOContext {
/**
* What is the smallest reasonable seek that we should group
* ranges together during vectored read operation.
*/
private int minSeekForVectorReads;
/**
* What is the largest size that we should group ranges
* together during vectored read operation.
* Setting this value 0 will disable merging of ranges.
*/
private int maxReadSizeForVectorReads;
/**
* Default no arg constructor.
*/
public VectoredIOContext() {
}
public VectoredIOContext setMinSeekForVectoredReads(int minSeek) {
this.minSeekForVectorReads = minSeek;
return this;
}
public VectoredIOContext setMaxReadSizeForVectoredReads(int maxSize) {
this.maxReadSizeForVectorReads = maxSize;
return this;
}
public VectoredIOContext build() {
return this;
}
public int getMinSeekForVectorReads() {
return minSeekForVectorReads;
}
public int getMaxReadSizeForVectorReads() {
return maxReadSizeForVectorReads;
}
@Override
public String toString() {
return "VectoredIOContext{" +
"minSeekForVectorReads=" + minSeekForVectorReads +
", maxReadSizeForVectorReads=" + maxReadSizeForVectorReads +
'}';
}
}
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