dsmiley commented on code in PR #1926: URL: https://github.com/apache/solr/pull/1926#discussion_r1331009854
########## solr/core/src/java/org/apache/solr/cluster/maintenance/InactiveShardRemover.java: ########## @@ -0,0 +1,251 @@ +/* + * 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.solr.cluster.maintenance; + +import com.google.common.annotations.VisibleForTesting; +import java.io.IOException; +import java.lang.invoke.MethodHandles; +import java.util.Collection; +import java.util.HashSet; +import java.util.concurrent.Executors; +import java.util.concurrent.ScheduledExecutorService; +import java.util.concurrent.TimeUnit; +import java.util.stream.Collectors; +import org.apache.solr.api.ConfigurablePlugin; +import org.apache.solr.client.solrj.request.CollectionAdminRequest; +import org.apache.solr.client.solrj.response.CollectionAdminResponse; +import org.apache.solr.client.solrj.response.RequestStatusState; +import org.apache.solr.cloud.ClusterSingleton; +import org.apache.solr.common.cloud.ClusterState; +import org.apache.solr.common.cloud.DocCollection; +import org.apache.solr.common.cloud.Slice; +import org.apache.solr.common.cloud.ZkStateReader; +import org.apache.solr.common.util.SolrNamedThreadFactory; +import org.apache.solr.core.CoreContainer; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +/** This Cluster Singleton can be configured to periodically find and remove inactive Shards */ +public class InactiveShardRemover + implements ClusterSingleton, ConfigurablePlugin<InactiveShardRemoverConfig> { + + private static final Logger log = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass()); + + public static final String PLUGIN_NAME = ".inactive-shard-remover"; + + static class DeleteActor { + + private final CoreContainer coreContainer; + + DeleteActor(final CoreContainer coreContainer) { + this.coreContainer = coreContainer; + } + + void delete(final Slice slice, final String asyncId) throws IOException { + CollectionAdminRequest.DeleteShard deleteRequest = + CollectionAdminRequest.deleteShard(slice.getCollection(), slice.getName()); + deleteRequest.setAsyncId(asyncId); + coreContainer.getZkController().getSolrCloudManager().request(deleteRequest); + } + } + + private State state = State.STOPPED; + + private final CoreContainer coreContainer; + + private final DeleteActor deleteActor; + + private ScheduledExecutorService executor; + + private long scheduleIntervalSeconds; + + private long ttlSeconds; + + private int maxDeletesPerCycle; + + /** Constructor invoked via Reflection */ + public InactiveShardRemover(final CoreContainer cc) { + this(cc, new DeleteActor(cc)); + } + + @VisibleForTesting + InactiveShardRemover(final CoreContainer cc, final DeleteActor actor) { + this.coreContainer = cc; + this.deleteActor = actor; + } + + @Override + public void configure(final InactiveShardRemoverConfig cfg) { + this.scheduleIntervalSeconds = cfg.scheduleIntervalSeconds; + this.maxDeletesPerCycle = cfg.maxDeletesPerCycle; + this.ttlSeconds = cfg.ttlSeconds; + } + + @Override + public String getName() { + return PLUGIN_NAME; + } + + @Override + public State getState() { + return state; + } + + @Override + public void start() throws Exception { + state = State.STARTING; + executor = Executors.newScheduledThreadPool(1, new SolrNamedThreadFactory(PLUGIN_NAME)); + executor.scheduleAtFixedRate( + this::deleteInactiveSlices, + scheduleIntervalSeconds, + scheduleIntervalSeconds, + TimeUnit.SECONDS); + state = State.RUNNING; + } + + @Override + public void stop() { + if (state == State.RUNNING) { + state = State.STOPPING; + executor.shutdownNow(); + try { + if (!executor.awaitTermination(10, TimeUnit.SECONDS)) { + log.warn( + "Executor pool did not terminate within the specified timeout: {} {}", + 10, + TimeUnit.SECONDS); + } + } catch (InterruptedException e) { + log.warn("Failed to shut down the executor pool", e); + Thread.currentThread().interrupt(); + } + } + state = State.STOPPED; + } + + @VisibleForTesting + void deleteInactiveSlices() { + final ClusterState clusterState = coreContainer.getZkController().getClusterState(); + Collection<Slice> inactiveSlices = new HashSet<>(); + clusterState + .getCollectionsMap() + .forEach((k, v) -> inactiveSlices.addAll(collectInactiveSlices(v))); + + if (log.isInfoEnabled()) { + log.info( + "Found {} inactive Shards to delete, {} will be deleted", + inactiveSlices.size(), + Math.max(inactiveSlices.size(), maxDeletesPerCycle)); + } + + inactiveSlices.stream().limit(maxDeletesPerCycle).forEach(this::deleteShard); + } + + private Collection<Slice> collectInactiveSlices(final DocCollection docCollection) { + final Collection<Slice> slices = new HashSet<>(docCollection.getSlices()); + slices.removeAll(docCollection.getActiveSlices()); + return slices.stream().filter(this::isExpired).collect(Collectors.toList()); + } + + private void deleteShard(final Slice s) { + final String asyncId = s.getCollection() + ";" + s.getName() + ";DELETESHARD"; Review Comment: Since no process / user is waiting for the response, I think it's simpler to just call it synchronously. -- This is an automated message from the Apache Git Service. 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