/**
* 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.hadoop.hive.llap.daemon.impl;
import java.util.Set;
/**
* Task scheduler interface
*/
public interface Scheduler<T> {
enum SubmissionState {
ACCEPTED, // request accepted
REJECTED, // request rejected as wait queue is full
EVICTED_OTHER; // request accepted but evicted other low priority task
}
/**
* Schedule the task or throw RejectedExecutionException if queues are full
* @param t - task to schedule
* @return SubmissionState
*/
SubmissionState schedule(T t);
/**
* Attempt to kill the fragment with the specified fragmentId
* @param fragmentId
*/
void killFragment(String fragmentId);
Set<String> getExecutorsStatus();
int getNumActive();
QueryIdentifier findQueryByFragment(String fragmentId);
}