/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* 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.linkedin.pinot.core.query.scheduler;
import com.google.common.base.Preconditions;
import com.google.common.util.concurrent.ListenableFuture;
import com.linkedin.pinot.common.metrics.ServerQueryPhase;
import com.linkedin.pinot.common.query.QueryExecutor;
import com.linkedin.pinot.common.query.ServerQueryRequest;
import com.linkedin.pinot.common.utils.DataTable;
import java.util.concurrent.Callable;
import javax.annotation.Nonnull;
import org.apache.commons.configuration.Configuration;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* First Come First Served(FCFS) query scheduler.
* The FCFS policy applies across all tables.
* This is similar to the existing query scheduling logic.
*/
public class FCFSQueryScheduler extends QueryScheduler {
private static Logger LOGGER = LoggerFactory.getLogger(FCFSQueryScheduler.class);
public FCFSQueryScheduler(@Nonnull Configuration schedulerConfig, @Nonnull QueryExecutor queryExecutor) {
super(schedulerConfig, queryExecutor);
Preconditions.checkNotNull(queryExecutor);
}
@Override
public ListenableFuture<DataTable> submit(final ServerQueryRequest queryRequest) {
Preconditions.checkNotNull(queryRequest);
queryRequest.getTimerContext().startNewPhaseTimer(ServerQueryPhase.SCHEDULER_WAIT);
ListenableFuture<DataTable> queryResultFuture = queryRunners.submit(new Callable<DataTable>() {
@Override
public DataTable call() {
return queryExecutor.processQuery(queryRequest, queryWorkers);
}
});
return queryResultFuture;
}
}