io.trino.memory.TotalReservationLowMemoryKiller Maven / Gradle / Ivy
/*
* 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.trino.memory;
import io.trino.spi.QueryId;
import java.util.List;
import java.util.Optional;
public class TotalReservationLowMemoryKiller
implements LowMemoryKiller
{
@Override
public Optional chooseTargetToKill(List runningQueries, List nodes)
{
Optional biggestQuery = Optional.empty();
long maxMemory = 0;
for (RunningQueryInfo query : runningQueries) {
long bytesUsed = query.getMemoryReservation();
if (bytesUsed > maxMemory) {
biggestQuery = Optional.of(query.getQueryId());
maxMemory = bytesUsed;
}
}
return biggestQuery.map(KillTarget::wholeQuery);
}
}