spark ShuffleSortDataFormat 源码
spark ShuffleSortDataFormat 代码
文件路径：/core/src/main/java/org/apache/spark/shuffle/sort/ShuffleSortDataFormat.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.shuffle.sort;
import org.apache.spark.unsafe.Platform;
import org.apache.spark.unsafe.array.LongArray;
import org.apache.spark.util.collection.SortDataFormat;
final class ShuffleSortDataFormat extends SortDataFormat<PackedRecordPointer, LongArray> {
private final LongArray buffer;
ShuffleSortDataFormat(LongArray buffer) {
this.buffer = buffer;
}
@Override
public PackedRecordPointer getKey(LongArray data, int pos) {
// Since we re-use keys, this method shouldn't be called.
throw new UnsupportedOperationException();
}
@Override
public PackedRecordPointer newKey() {
return new PackedRecordPointer();
}
@Override
public PackedRecordPointer getKey(LongArray data, int pos, PackedRecordPointer reuse) {
reuse.set(data.get(pos));
return reuse;
}
@Override
public void swap(LongArray data, int pos0, int pos1) {
final long temp = data.get(pos0);
data.set(pos0, data.get(pos1));
data.set(pos1, temp);
}
@Override
public void copyElement(LongArray src, int srcPos, LongArray dst, int dstPos) {
dst.set(dstPos, src.get(srcPos));
}
@Override
public void copyRange(LongArray src, int srcPos, LongArray dst, int dstPos, int length) {
Platform.copyMemory(
src.getBaseObject(),
src.getBaseOffset() + srcPos * 8L,
dst.getBaseObject(),
dst.getBaseOffset() + dstPos * 8L,
length * 8L
);
}
@Override
public LongArray allocate(int length) {
assert (length <= buffer.size()) :
"the buffer is smaller than required: " + buffer.size() + " < " + length;
return buffer;
}
}
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