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Introduce NODE_AWARE partitioning group type
For Kubernetes based environments, user might want to store their backups at another Kubernetes node. They can easily decide which pod will be runing on which node via defining labels or node-selector. To satisfy these kind of specific requirements, NODE_AWARE partition group type is introduced. Newly created NodeAwareMemberGroupFactory class is just simplified version of ZoneAwareMemberGroupFactory.
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59 changes: 59 additions & 0 deletions
59
...c/main/java/com/hazelcast/internal/partition/membergroup/NodeAwareMemberGroupFactory.java
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/* | ||
* Copyright (c) 2008-2020, Hazelcast, Inc. All Rights Reserved. | ||
* | ||
* 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. | ||
*/ | ||
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package com.hazelcast.internal.partition.membergroup; | ||
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import com.hazelcast.cluster.Member; | ||
import com.hazelcast.spi.discovery.DiscoveryStrategy; | ||
import com.hazelcast.spi.partitiongroup.MemberGroup; | ||
import com.hazelcast.spi.partitiongroup.PartitionGroupMetaData; | ||
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import java.util.Collection; | ||
import java.util.HashSet; | ||
import java.util.Map; | ||
import java.util.Set; | ||
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import static com.hazelcast.internal.util.MapUtil.createHashMap; | ||
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/** | ||
* NodeAwareMemberGroupFactory is responsible for MemberGroups | ||
* creation according to name of the node metadata. For container orchestration | ||
* tools like Kubernetes and Docker Swarm, node is the term used to refer | ||
* machine that containers/pods run on. A node may be a virtual or physical machine. | ||
* Node name metadata provided by | ||
* {@link DiscoveryStrategy#discoverLocalMetadata()} | ||
*/ | ||
public class NodeAwareMemberGroupFactory extends BackupSafeMemberGroupFactory implements MemberGroupFactory { | ||
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@Override | ||
protected Set<MemberGroup> createInternalMemberGroups(Collection<? extends Member> allMembers) { | ||
Map<String, MemberGroup> groups = createHashMap(allMembers.size()); | ||
for (Member member : allMembers) { | ||
final String nodeInfo = member.getAttribute(PartitionGroupMetaData.PARTITION_GROUP_NODE); | ||
if (nodeInfo == null) { | ||
throw new IllegalArgumentException("Not enough metadata information is provided. " | ||
+ "Node name information must be provided with NODE_AWARE partition group."); | ||
} | ||
MemberGroup group = groups.get(nodeInfo); | ||
if (group == null) { | ||
group = new DefaultMemberGroup(); | ||
groups.put(nodeInfo, group); | ||
} | ||
group.addMember(member); | ||
} | ||
return new HashSet<>(groups.values()); | ||
} | ||
} |
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