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Normalized Cost Balancer (apache#3632)
* Normalized Cost Balancer * Adding documentation and renaming to use diskNormalizedCostBalancer * Remove balancer from the strings * Update docs and include random cost balancer * Fix checkstyle issues
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59 changes: 59 additions & 0 deletions
59
server/src/main/java/io/druid/server/coordinator/DiskNormalizedCostBalancerStrategy.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /* | ||
| * Licensed to Metamarkets Group Inc. (Metamarkets) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. Metamarkets 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. | ||
| */ | ||
|
|
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| package io.druid.server.coordinator; | ||
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| import com.google.common.util.concurrent.ListeningExecutorService; | ||
| import io.druid.timeline.DataSegment; | ||
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| public class DiskNormalizedCostBalancerStrategy extends CostBalancerStrategy | ||
| { | ||
| public DiskNormalizedCostBalancerStrategy(ListeningExecutorService exec) | ||
| { | ||
| super(exec); | ||
| } | ||
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| /** | ||
| * Averages the cost obtained from CostBalancerStrategy. Also the costs are weighted according to their usage ratios. | ||
| * This ensures that all the hosts will have the same % disk utilization. | ||
| */ | ||
| @Override | ||
| protected double computeCost( | ||
| final DataSegment proposalSegment, final ServerHolder server, final boolean includeCurrentServer | ||
| ) | ||
| { | ||
| double cost = super.computeCost(proposalSegment, server, includeCurrentServer); | ||
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| if(cost == Double.POSITIVE_INFINITY){ | ||
| return cost; | ||
| } | ||
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| int nSegments = 1; | ||
| if(server.getServer().getSegments().size() > 0) | ||
| { | ||
| nSegments = server.getServer().getSegments().size(); | ||
| } | ||
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| double normalizedCost = cost/nSegments; | ||
| double usageRatio = (double)server.getServer().getCurrSize()/(double)server.getServer().getMaxSize(); | ||
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| return normalizedCost*usageRatio; | ||
| } | ||
| } | ||
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30 changes: 30 additions & 0 deletions
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.../src/main/java/io/druid/server/coordinator/DiskNormalizedCostBalancerStrategyFactory.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /* | ||
| * Licensed to Metamarkets Group Inc. (Metamarkets) under one | ||
| * or more contributor license agreements. See the NOTICE file | ||
| * distributed with this work for additional information | ||
| * regarding copyright ownership. Metamarkets 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 io.druid.server.coordinator; | ||
|
|
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| import com.google.common.util.concurrent.ListeningExecutorService; | ||
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| public class DiskNormalizedCostBalancerStrategyFactory implements BalancerStrategyFactory | ||
| { | ||
| @Override | ||
| public BalancerStrategy createBalancerStrategy(ListeningExecutorService exec) | ||
| { | ||
| return new DiskNormalizedCostBalancerStrategy(exec); | ||
| } | ||
| } |
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