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/**
* 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.ozone.container.common.impl;
import com.google.common.base.Preconditions;
import org.apache.hadoop.hdds.scm.container.common.helpers
.StorageContainerException;
import org.apache.hadoop.ozone.container.common.helpers.ContainerData;
import org.apache.hadoop.ozone.container.common.interfaces
.ContainerDeletionChoosingPolicy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
/**
* TopN Ordered choosing policy that choosing containers based on pending
* deletion blocks' number.
*/
public class TopNOrderedContainerDeletionChoosingPolicy
implements ContainerDeletionChoosingPolicy {
private static final Logger LOG =
LoggerFactory.getLogger(TopNOrderedContainerDeletionChoosingPolicy.class);
/** customized comparator used to compare differentiate container status. **/
private static final Comparator<ContainerStatus> CONTAINER_STATUS_COMPARATOR
= new Comparator<ContainerStatus>() {
@Override
public int compare(ContainerStatus c1, ContainerStatus c2) {
return Integer.compare(c2.getNumPendingDeletionBlocks(),
c1.getNumPendingDeletionBlocks());
}
};
@Override
public List<ContainerData> chooseContainerForBlockDeletion(int count,
Map<String, ContainerStatus> candidateContainers)
throws StorageContainerException {
Preconditions.checkNotNull(candidateContainers,
"Internal assertion: candidate containers cannot be null");
List<ContainerData> result = new LinkedList<>();
List<ContainerStatus> orderedList = new LinkedList<>();
orderedList.addAll(candidateContainers.values());
Collections.sort(orderedList, CONTAINER_STATUS_COMPARATOR);
// get top N list ordered by pending deletion blocks' number
int currentCount = 0;
for (ContainerStatus entry : orderedList) {
if (currentCount < count) {
if (entry.getNumPendingDeletionBlocks() > 0) {
result.add(entry.getContainer());
currentCount++;
LOG.debug(
"Select container {} for block deletion, "
+ "pending deletion blocks num: {}.",
entry.getContainer().getContainerName(),
entry.getNumPendingDeletionBlocks());
} else {
LOG.debug("Stop looking for next container, there is no"
+ " pending deletion block contained in remaining containers.");
break;
}
} else {
break;
}
}
return result;
}
}
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