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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.
/*
* 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.cassandra.index.sai.disk.v1.vector;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import javax.annotation.concurrent.NotThreadSafe;
import io.github.jbellis.jvector.util.RamUsageEstimator;
import org.apache.cassandra.db.marshal.VectorType;
import org.apache.cassandra.io.util.SequentialWriter;
@NotThreadSafe
public class CompactionVectorValues implements RamAwareVectorValues
{
private final int dimension;
private final ArrayList values = new ArrayList<>();
private final VectorType type;
public CompactionVectorValues(VectorType type)
{
this.dimension = type.dimension;
this.type = type;
}
@Override
public int size()
{
return values.size();
}
@Override
public int dimension()
{
return dimension;
}
@Override
public float[] vectorValue(int i)
{
return type.composeAsFloat(values.get(i));
}
/** return approximate bytes used by the new vector */
public long add(int ordinal, ByteBuffer value)
{
if (ordinal != values.size())
throw new IllegalArgumentException(String.format("CVV requires vectors to be added in ordinal order (%d given, expected %d)",
ordinal, values.size()));
values.add(value);
return RamEstimation.concurrentHashMapRamUsed(1) + oneVectorBytesUsed();
}
@Override
public CompactionVectorValues copy()
{
return this;
}
public long write(SequentialWriter writer) throws IOException
{
writer.writeInt(size());
writer.writeInt(dimension());
for (var i = 0; i < size(); i++) {
var bb = values.get(i);
assert bb != null : "null vector at index " + i + " of " + size();
writer.write(bb);
}
return writer.position();
}
@Override
public boolean isValueShared()
{
return false;
}
private long oneVectorBytesUsed()
{
return RamUsageEstimator.NUM_BYTES_OBJECT_REF;
}
}