CASSANDRA-20177 use Apache Datasketches for cardinality computation #3767
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,82 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.cassandra.io.sstable.metadata; | ||
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| import java.io.IOException; | ||
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| import org.apache.datasketches.hll.HllSketch; | ||
| import org.apache.datasketches.hll.Union; | ||
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| public class DefaultCardinality implements ICardinality<HllSketch> | ||
| { | ||
| private static final int DEFAULT_LG_MAX_K = 13; | ||
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| private final HllSketch hllSketch; | ||
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| public DefaultCardinality() | ||
| { | ||
| this(new HllSketch(HllSketch.DEFAULT_LG_K)); | ||
| } | ||
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| public DefaultCardinality(HllSketch hllSketch) | ||
| { | ||
| this.hllSketch = hllSketch; | ||
| } | ||
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| @Override | ||
| public void offerHashed(long hashed) | ||
| { | ||
| hllSketch.update(hashed); | ||
| } | ||
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| @Override | ||
| public long cardinality() | ||
| { | ||
| return (long) hllSketch.getEstimate(); | ||
| } | ||
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| @Override | ||
| public int sizeof() | ||
| { | ||
| return hllSketch.toUpdatableByteArray().length; | ||
| } | ||
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| @Override | ||
| public byte[] getBytes() throws IOException | ||
| { | ||
| return hllSketch.toUpdatableByteArray(); | ||
| } | ||
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| @Override | ||
| public HllSketch getCardinality() | ||
| { | ||
| return hllSketch; | ||
| } | ||
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| @Override | ||
| public ICardinality<HllSketch> merge(HllSketch cardinality) throws CardinalityMergeException | ||
| { | ||
| Union union = new Union(DEFAULT_LG_MAX_K); | ||
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| union.update(hllSketch); | ||
| union.update(cardinality); | ||
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| return new DefaultCardinality(union.getResult()); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
|
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| package org.apache.cassandra.io.sstable.metadata; | ||
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| import java.io.IOException; | ||
|
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| public interface ICardinality<T> | ||
| { | ||
| void offerHashed(long hashed); | ||
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| long cardinality(); | ||
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| int sizeof(); | ||
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| byte[] getBytes() throws IOException; | ||
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| ICardinality<T> merge(T cardinality) throws CardinalityMergeException; | ||
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| T getCardinality(); | ||
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| class CardinalityMergeException extends Exception | ||
| { | ||
| public CardinalityMergeException(Throwable cause) | ||
| { | ||
| super(cause); | ||
| } | ||
| } | ||
| } |
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This is still used, just refactored (see the code above), this would happen when not all SSTables are on same format.