jordanly commented on a change in pull request #37: Staggered (Variable batch) Updates URL: https://github.com/apache/aurora/pull/37#discussion_r221013032
########## File path: src/main/java/org/apache/aurora/scheduler/updater/strategy/VariableBatchStrategy.java ########## @@ -0,0 +1,152 @@ +/** + * 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. + */ +package org.apache.aurora.scheduler.updater.strategy; + +import java.util.List; +import java.util.Objects; +import java.util.Optional; +import java.util.Set; +import java.util.stream.Collectors; + +import com.google.common.base.Preconditions; +import com.google.common.collect.ImmutableList; +import com.google.common.collect.ImmutableSet; +import com.google.common.collect.Ordering; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** + * A strategy that limits the number of instances selected by the subclass using variable steps. + * + * @param <T> Instance type. + */ +public class VariableBatchStrategy<T extends Comparable<T>> implements UpdateStrategy<T> { + private final Ordering<T> ordering; + protected final ImmutableList<Integer> maxActiveGroups; + private final boolean rollingForward; + private Optional<Integer> totalModInstanceCount; + + private static final Logger LOG = LoggerFactory.getLogger(VariableBatchStrategy.class); + + /** + * Creates a variable active-limited strategy that applies an upper bound to all results. + * + * @param maxActiveGroups List of Maximum group sizes. Each group size represents a step. + * {@link #getNextGroup(Set, Set)}. + */ + public VariableBatchStrategy(Ordering<T> ordering, + List<Integer> maxActiveGroups, + boolean rollingForward) { + + this.ordering = Objects.requireNonNull(ordering); + this.rollingForward = rollingForward; + + maxActiveGroups.forEach(x -> Preconditions.checkArgument(x > 0)); + + this.maxActiveGroups = ImmutableList.copyOf(maxActiveGroups); + this.totalModInstanceCount = Optional.empty(); + } + + // Determine how far we're into the update based upon how many instances are waiting + // to be modified. + private int determineCurGroupSize(int remaining) { + + // Calculate which groupIndex we are in by finding out how many instances we have left to update + int modified = totalModInstanceCount.get() - remaining; + + int lastGroupSize = maxActiveGroups.get(maxActiveGroups.size() - 1); + + LOG.debug("Variable Batch Update progress: {} instances have been modified, " + + "{} instances remain unmodified, and {} overall instances to be modified.", + modified, + remaining, + totalModInstanceCount.get()); + + if (rollingForward) { + Review comment: nit: remove extra newline ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
