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SizeBasedSplitWeightProvider.java
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SizeBasedSplitWeightProvider.java
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/*
* Licensed 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 com.facebook.presto.hive.util;
import com.facebook.presto.hive.HiveSplitWeightProvider;
import com.facebook.presto.spi.SplitWeight;
import io.airlift.units.DataSize;
import static com.google.common.base.Preconditions.checkArgument;
import static java.util.Objects.requireNonNull;
public class SizeBasedSplitWeightProvider
implements HiveSplitWeightProvider
{
private final double minimumWeight;
// The configured size for being used to break files into splits,
// this size corresponds to a "standard" weight proportion of 1.0
private final double targetSplitSizeInBytes;
public SizeBasedSplitWeightProvider(double minimumWeight, DataSize targetSplitSize)
{
checkArgument(Double.isFinite(minimumWeight) && minimumWeight > 0 && minimumWeight <= 1, "minimumWeight must be > 0 and <= 1, found: %s", minimumWeight);
this.minimumWeight = minimumWeight;
long targetSizeInBytes = requireNonNull(targetSplitSize, "targetSplitSize is null").toBytes();
checkArgument(targetSizeInBytes > 0, "targetSplitSize must be > 0, found: %s", targetSplitSize);
this.targetSplitSizeInBytes = (double) targetSizeInBytes;
}
@Override
public SplitWeight weightForSplitSizeInBytes(long splitSizeInBytes)
{
// Clamp the value be between the minimum weight and 1.0 (standard weight)
return SplitWeight.fromProportion(Math.min(Math.max(splitSizeInBytes / targetSplitSizeInBytes, minimumWeight), 1.0));
}
}