/**
* 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.drill.exec.planner.physical.visitor;
import org.apache.drill.exec.ExecConstants;
import org.apache.drill.exec.planner.cost.DrillCostBase;
import org.apache.drill.exec.planner.physical.Prel;
import org.apache.drill.exec.server.options.OptionManager;
import org.eigenbase.rel.metadata.RelMetadataQuery;
public class MemoryEstimationVisitor extends BasePrelVisitor<Double, Void, RuntimeException> {
static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(MemoryEstimationVisitor.class);
public static boolean enoughMemory(Prel prel, OptionManager options, int numDrillbits) {
long allottedMemory = options.getOption(ExecConstants.MAX_QUERY_MEMORY_PER_NODE_KEY).num_val * numDrillbits;
long estimatedMemory = (long) Math.ceil(prel.accept(new MemoryEstimationVisitor(), null) / (1024.0 * 1024.0));
estimatedMemory += options.getOption(ExecConstants.NON_BLOCKING_OPERATORS_MEMORY_KEY).num_val * numDrillbits;
if (estimatedMemory > allottedMemory) {
logger.debug("Estimated memory (" + estimatedMemory + ") exceeds maximum allowed (" + allottedMemory + ")");
} else {
logger.debug("Estimated memory (" + estimatedMemory + ") within maximum allowed (" + allottedMemory + ")");
}
return estimatedMemory <= allottedMemory;
}
public static Double estimateMemory(Prel prel) {
return prel.accept(new MemoryEstimationVisitor(), null);
}
public MemoryEstimationVisitor() {
}
@Override
public Double visitPrel(Prel prel, Void value) throws RuntimeException {
return ((DrillCostBase) RelMetadataQuery.getCumulativeCost(prel)).getMemory();
// return findCost(prel);
}
private double findCost(Prel prel) {
DrillCostBase cost = (DrillCostBase) RelMetadataQuery.getNonCumulativeCost(prel);
double memory = cost.getMemory();
for (Prel child : prel) {
memory += findCost(child);
}
return memory;
}
}