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UnusedTableRemover.java
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UnusedTableRemover.java
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/*
* Copyright (c) 2022 nosqlbench
*
* 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 io.nosqlbench.cqlgen.transformers;
import io.nosqlbench.cqlgen.api.CGModelTransformer;
import io.nosqlbench.cqlgen.api.CGTransformerConfigurable;
import io.nosqlbench.cqlgen.core.CGWorkloadExporter;
import io.nosqlbench.cqlgen.model.CqlModel;
import io.nosqlbench.cqlgen.model.CqlTable;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import java.util.List;
import java.util.Map;
public class UnusedTableRemover implements CGModelTransformer, CGTransformerConfigurable {
private final static Logger logger = LogManager.getLogger(CGWorkloadExporter.APPNAME+"/unused-table-remover");
private double minimumThreshold = 0.0001;
private String name;
@Override
public CqlModel apply(CqlModel model) {
if (!model.hasStats()) {
logger.warn("Unused table remover is not active since there are no stats provided.");
return model;
}
List<CqlTable> tableDefs = model.getTableDefs();
for (CqlTable table : tableDefs) {
String weightedOpsSpec = table.getTableAttributes().getAttribute("weighted_ops");
double weightedOps = Double.parseDouble(weightedOpsSpec);
if (weightedOps < minimumThreshold) {
logger.info(() -> String.format(
"removing table " + table.getKeyspace().getName() + "." + table.getName() + " with minimum weighted_ops of %1.5f under %1.5f",
weightedOps, minimumThreshold)
);
table.getKeyspace().removeTable(table);
}
}
return model;
}
@Override
public void setName(String name) {
this.name = name;
}
@Override
public void accept(Object cfgObj) {
if (cfgObj instanceof Map stringMap) {
Object fractionalThresholdSpec = stringMap.get("percentage_threshold");
if (fractionalThresholdSpec != null) {
this.minimumThreshold = Double.parseDouble(fractionalThresholdSpec.toString());
}
} else {
throw new RuntimeException("unused table remover requires a Map for its config value.");
}
}
@Override
public String getName() {
return this.name;
}
}