spark MergedBlockMeta 源码
spark MergedBlockMeta 代码
文件路径：/common/network-shuffle/src/main/java/org/apache/spark/network/shuffle/MergedBlockMeta.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.shuffle;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import com.google.common.base.Preconditions;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import org.roaringbitmap.RoaringBitmap;
import org.apache.spark.network.buffer.ManagedBuffer;
import org.apache.spark.network.protocol.Encoders;
/**
* Contains meta information for a merged block. Currently this information constitutes:
* 1. Number of chunks in a merged shuffle block.
* 2. Bitmaps for each chunk in the merged block. A chunk bitmap contains all the mapIds that were
* merged to that merged block chunk.
*
* @since 3.1.0
*/
public class MergedBlockMeta {
private final int numChunks;
private final ManagedBuffer chunksBitmapBuffer;
public MergedBlockMeta(int numChunks, ManagedBuffer chunksBitmapBuffer) {
this.numChunks = numChunks;
this.chunksBitmapBuffer = Preconditions.checkNotNull(chunksBitmapBuffer);
}
public int getNumChunks() {
return numChunks;
}
public ManagedBuffer getChunksBitmapBuffer() {
return chunksBitmapBuffer;
}
public RoaringBitmap[] readChunkBitmaps() throws IOException {
ByteBuf buf = Unpooled.wrappedBuffer(chunksBitmapBuffer.nioByteBuffer());
List<RoaringBitmap> bitmaps = new ArrayList<>();
while(buf.isReadable()) {
bitmaps.add(Encoders.Bitmaps.decode(buf));
}
assert (bitmaps.size() == numChunks);
return bitmaps.toArray(new RoaringBitmap[0]);
}
}
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