sanpwc commented on code in PR #2041: URL: https://github.com/apache/ignite-3/pull/2041#discussion_r1189820241
########## modules/distribution-zones/src/main/java/org/apache/ignite/internal/distributionzones/rebalance/DistributionZoneRebalanceEngine.java: ########## @@ -0,0 +1,286 @@ +/* + * 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.ignite.internal.distributionzones.rebalance; + +import static java.util.concurrent.CompletableFuture.allOf; +import static java.util.concurrent.CompletableFuture.completedFuture; +import static java.util.concurrent.CompletableFuture.failedFuture; +import static org.apache.ignite.internal.distributionzones.DistributionZonesUtil.dataNodes; +import static org.apache.ignite.internal.distributionzones.DistributionZonesUtil.extractZoneId; +import static org.apache.ignite.internal.distributionzones.DistributionZonesUtil.getZoneById; +import static org.apache.ignite.internal.distributionzones.DistributionZonesUtil.zoneDataNodesKey; +import static org.apache.ignite.internal.distributionzones.rebalance.RebalanceUtil.updatePendingAssignmentsKeys; +import static org.apache.ignite.lang.ErrorGroups.Common.NODE_STOPPING_ERR; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.Set; +import java.util.UUID; +import java.util.concurrent.CompletableFuture; +import java.util.concurrent.atomic.AtomicBoolean; +import org.apache.ignite.configuration.NamedConfigurationTree; +import org.apache.ignite.configuration.notifications.ConfigurationNotificationEvent; +import org.apache.ignite.internal.affinity.Assignment; +import org.apache.ignite.internal.distributionzones.DistributionZoneManager; +import org.apache.ignite.internal.distributionzones.configuration.DistributionZoneConfiguration; +import org.apache.ignite.internal.distributionzones.configuration.DistributionZoneView; +import org.apache.ignite.internal.distributionzones.configuration.DistributionZonesConfiguration; +import org.apache.ignite.internal.logger.IgniteLogger; +import org.apache.ignite.internal.logger.Loggers; +import org.apache.ignite.internal.metastorage.MetaStorageManager; +import org.apache.ignite.internal.metastorage.WatchEvent; +import org.apache.ignite.internal.metastorage.WatchListener; +import org.apache.ignite.internal.schema.configuration.ExtendedTableConfiguration; +import org.apache.ignite.internal.schema.configuration.TableChange; +import org.apache.ignite.internal.schema.configuration.TableConfiguration; +import org.apache.ignite.internal.schema.configuration.TableView; +import org.apache.ignite.internal.schema.configuration.TablesConfiguration; +import org.apache.ignite.internal.util.ByteUtils; +import org.apache.ignite.internal.util.IgniteSpinBusyLock; +import org.apache.ignite.lang.IgniteException; +import org.apache.ignite.lang.NodeStoppingException; + +/** + * Zone rebalance manager. + */ +public class DistributionZoneRebalanceEngine { + /** The logger. */ + private static final IgniteLogger LOG = Loggers.forClass(DistributionZoneRebalanceEngine.class); + + /** Prevents double stopping of the component. */ + private final AtomicBoolean stopGuard; + + /** Busy lock to stop synchronously. */ + private final IgniteSpinBusyLock busyLock; + + /** Distribution zone configuration. */ + private final DistributionZonesConfiguration zonesConfiguration; + + /** Tables configuration. */ + private final TablesConfiguration tablesConfiguration; + + /** Meta Storage manager. */ + private final MetaStorageManager metaStorageManager; + + /** Distribution zones manager. */ + private final DistributionZoneManager distributionZoneManager; + + /** Meta storage listener for data nodes changes. */ + private final WatchListener dataNodesListener; + + /** + * The constructor. + * + * @param stopGuard Prevents double stopping of the component. + * @param busyLock Busy lock to stop synchronously. + * @param zonesConfiguration Distribution zone configuration. + * @param tablesConfiguration Tables configuration. + * @param metaStorageManager Meta Storage manager. + * @param distributionZoneManager Distribution zones manager. + */ + public DistributionZoneRebalanceEngine( + AtomicBoolean stopGuard, + IgniteSpinBusyLock busyLock, + DistributionZonesConfiguration zonesConfiguration, + TablesConfiguration tablesConfiguration, + MetaStorageManager metaStorageManager, + DistributionZoneManager distributionZoneManager + ) { + this.stopGuard = stopGuard; + this.busyLock = busyLock; + this.zonesConfiguration = zonesConfiguration; + this.tablesConfiguration = tablesConfiguration; + this.metaStorageManager = metaStorageManager; + this.distributionZoneManager = distributionZoneManager; + + this.dataNodesListener = createDistributionZonesDataNodesListener(); + } + + /** + * Starts the rebalance engine by registering corresponding meta storage and configuration listeners. + */ + public void start() { + if (!busyLock.enterBusy()) { + throw new IgniteException(NODE_STOPPING_ERR, new NodeStoppingException()); + } + + try { + zonesConfiguration.distributionZones().any().replicas().listen(this::onUpdateReplicas); + + // TODO: IGNITE-18694 - Recovery for the case when zones watch listener processed event but assignments were not updated. + metaStorageManager.registerPrefixWatch(zoneDataNodesKey(), dataNodesListener); + } finally { + busyLock.leaveBusy(); + } + } + + /** + * Stops the rebalance engine by unregistering meta storage watches. + */ + public void stop() { + if (!stopGuard.compareAndSet(false, true)) { + return; + } + + busyLock.block(); + + metaStorageManager.unregisterWatch(dataNodesListener); + } + + private WatchListener createDistributionZonesDataNodesListener() { + return new WatchListener() { + @Override + public CompletableFuture<Void> onUpdate(WatchEvent evt) { + if (!busyLock.enterBusy()) { + return failedFuture(new NodeStoppingException()); + } + + try { + byte[] dataNodesBytes = evt.entryEvent().newEntry().value(); + + if (dataNodesBytes == null) { + //The zone was removed so data nodes was removed too. + return completedFuture(null); + } + + NamedConfigurationTree<TableConfiguration, TableView, TableChange> tables = tablesConfiguration.tables(); + + int zoneId = extractZoneId(evt.entryEvent().newEntry().key()); + + Set<String> dataNodes = dataNodes(ByteUtils.fromBytes(dataNodesBytes)); + + for (int i = 0; i < tables.value().size(); i++) { + TableView tableView = tables.value().get(i); + + int tableZoneId = tableView.zoneId(); + + DistributionZoneConfiguration distributionZoneConfiguration = + getZoneById(zonesConfiguration, tableZoneId); + + if (zoneId == tableZoneId) { + TableConfiguration tableCfg = tables.get(tableView.name()); + + byte[] assignmentsBytes = ((ExtendedTableConfiguration) tableCfg).assignments().value(); + + List<Set<Assignment>> tableAssignments = assignmentsBytes == null ? Collections.emptyList() : + ByteUtils.fromBytes(assignmentsBytes); + + for (int part = 0; part < distributionZoneConfiguration.partitions().value(); part++) { + UUID tableId = ((ExtendedTableConfiguration) tableCfg).id().value(); + + TablePartitionId replicaGrpId = new TablePartitionId(tableId, part); + + int replicas = distributionZoneConfiguration.replicas().value(); + + int partId = part; + + updatePendingAssignmentsKeys( + tableView.name(), + replicaGrpId, + dataNodes, + replicas, + evt.entryEvent().newEntry().revision(), + metaStorageManager, + part, + tableAssignments.isEmpty() ? Collections.emptySet() : tableAssignments.get(part) + ).exceptionally(e -> { Review Comment: Because it's harmless test related code that makes it possible to use table configuration injection in DistributionZoneRebalanceEngineTest ``` @InjectConfiguration ("mock.tables {" + "table0 = { zoneId = 1 }," + "table1 = { zoneId = 1 }," + "table2 = { zoneId = 2 }," + "table3 = { zoneId = 2 }," + "table4 = { zoneId = 2 }," + "table5 = { zoneId = 2 }}") TablesConfiguration tablesConfiguration ``` Otherwise test will fail because of null assignments. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
