diff options
Diffstat (limited to 'hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/RandomContainerDeletionChoosingPolicy.java')
-rw-r--r-- | hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/RandomContainerDeletionChoosingPolicy.java | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/RandomContainerDeletionChoosingPolicy.java b/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/RandomContainerDeletionChoosingPolicy.java new file mode 100644 index 0000000000..3e267d2b37 --- /dev/null +++ b/hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/impl/RandomContainerDeletionChoosingPolicy.java @@ -0,0 +1,70 @@ +/** + * 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.hdfs.DFSUtil; +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.LinkedList; +import java.util.List; +import java.util.Map; + +/** + * Randomly choosing containers for block deletion. + */ +public class RandomContainerDeletionChoosingPolicy + implements ContainerDeletionChoosingPolicy { + private static final Logger LOG = + LoggerFactory.getLogger(RandomContainerDeletionChoosingPolicy.class); + + @Override + public List<ContainerData> chooseContainerForBlockDeletion(int count, + Map<String, ContainerStatus> candidateContainers) + throws StorageContainerException { + Preconditions.checkNotNull(candidateContainers, + "Internal assertion: candidate containers cannot be null"); + + int currentCount = 0; + List<ContainerData> result = new LinkedList<>(); + ContainerStatus[] values = new ContainerStatus[candidateContainers.size()]; + // to get a shuffle list + for (ContainerStatus entry : DFSUtil.shuffle( + candidateContainers.values().toArray(values))) { + if (currentCount < count) { + result.add(entry.getContainer()); + currentCount++; + + LOG.debug("Select container {} for block deletion, " + + "pending deletion blocks num: {}.", + entry.getContainer().getContainerName(), + entry.getNumPendingDeletionBlocks()); + } else { + break; + } + } + + return result; + } +} |