meatballspaghetti commented on code in PR #5451: URL: https://github.com/apache/accumulo/pull/5451#discussion_r2056559063
########## core/src/main/java/org/apache/accumulo/core/util/tables/TableMapping.java: ########## @@ -0,0 +1,190 @@ +/* + * 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 + * + * https://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.accumulo.core.util.tables; + +import static java.util.Collections.emptySortedMap; +import static java.util.Objects.requireNonNull; +import static org.apache.accumulo.core.clientImpl.NamespaceMapping.deserializeMap; +import static org.apache.accumulo.core.clientImpl.NamespaceMapping.serializeMap; + +import java.util.Map; +import java.util.SortedMap; + +import org.apache.accumulo.core.Constants; +import org.apache.accumulo.core.clientImpl.AcceptableThriftTableOperationException; +import org.apache.accumulo.core.clientImpl.ClientContext; +import org.apache.accumulo.core.clientImpl.Namespace; +import org.apache.accumulo.core.clientImpl.thrift.TableOperation; +import org.apache.accumulo.core.clientImpl.thrift.TableOperationExceptionType; +import org.apache.accumulo.core.data.NamespaceId; +import org.apache.accumulo.core.data.TableId; +import org.apache.accumulo.core.metadata.AccumuloTable; +import org.apache.accumulo.core.zookeeper.ZcStat; +import org.apache.accumulo.core.zookeeper.ZooCache; +import org.apache.zookeeper.KeeperException; + +import com.google.common.base.MoreObjects; +import com.google.common.collect.ImmutableSortedMap; + +public class TableMapping { + + private final ClientContext context; + private final NamespaceId namespaceId; + private final String mappingPath; + private volatile SortedMap<TableId,String> currentTableMap = emptySortedMap(); + private volatile SortedMap<String,TableId> currentTableReverseMap = emptySortedMap(); + private volatile long lastMzxid; + + public TableMapping(ClientContext context, NamespaceId namespaceId) { + this.context = requireNonNull(context); + this.namespaceId = requireNonNull(namespaceId); + this.mappingPath = getZTableMapPath(namespaceId); + } + + public void put(TableId tableId, String tableName, TableOperation operation) + throws InterruptedException, KeeperException, AcceptableThriftTableOperationException { + requireNonNull(tableId); + var rawTableName = TableNameUtil.qualify(requireNonNull(tableName)).getSecond(); + requireNonNull(operation); + if (isBuiltInZKTable(tableId)) { + throw new AssertionError("Putting built-in tables in map should not be possible after init"); + } + context.getZooSession().asReaderWriter().mutateExisting(mappingPath, data -> { + var tables = deserializeMap(data); + final String currentName = tables.get(tableId.canonical()); + if (rawTableName.equals(currentName)) { + return null; // mapping already exists; operation is idempotent, so no change needed + } + if (currentName != null) { + throw new AcceptableThriftTableOperationException(tableId.canonical(), null, operation, + TableOperationExceptionType.EXISTS, "Table Id already exists"); + } + if (tables.containsValue(rawTableName)) { + throw new AcceptableThriftTableOperationException(tableId.canonical(), tableName, operation, + TableOperationExceptionType.EXISTS, "Table name already exists"); + } + tables.put(tableId.canonical(), rawTableName); + return serializeMap(tables); + }); + } + + public void remove(final TableId tableId) + throws InterruptedException, KeeperException, AcceptableThriftTableOperationException { + requireNonNull(tableId); + if (isBuiltInZKTable(tableId)) { + throw new AssertionError("Removing built-in tables in map should not be possible"); + } + context.getZooSession().asReaderWriter().mutateExisting(mappingPath, data -> { + var tables = deserializeMap(data); + if (!tables.containsKey(tableId.canonical())) { + throw new AcceptableThriftTableOperationException(null, tableId.canonical(), + TableOperation.DELETE, TableOperationExceptionType.NOTFOUND, + "Table already removed while processing"); + } + tables.remove(tableId.canonical()); + return serializeMap(tables); + }); + } + + public void rename(final TableId tableId, final String oldName, final String newName) + throws InterruptedException, KeeperException, AcceptableThriftTableOperationException { + requireNonNull(tableId); + var rawOldName = TableNameUtil.qualify(requireNonNull(oldName)).getSecond(); + var rawNewName = TableNameUtil.qualify(requireNonNull(newName)).getSecond(); + if (isBuiltInZKTable(tableId)) { + throw new AssertionError("Renaming built-in tables in map should not be possible"); + } + context.getZooSession().asReaderWriter().mutateExisting(mappingPath, data -> { + var tables = deserializeMap(data); + final String currentName = tables.get(tableId.canonical()); + if (rawNewName.equals(currentName)) { + return null; // assume in this case the operation is running again, so we are done + } + if (!rawOldName.equals(currentName)) { + throw new AcceptableThriftTableOperationException(null, oldName, TableOperation.RENAME, + TableOperationExceptionType.NOTFOUND, "Name changed while processing"); + } + if (tables.containsValue(rawNewName)) { + throw new AcceptableThriftTableOperationException(null, newName, TableOperation.RENAME, + TableOperationExceptionType.EXISTS, "Table name already exists"); + } + tables.put(tableId.canonical(), rawNewName); + return serializeMap(tables); + }); + } + + private synchronized void update() { + final ZooCache zc = context.getZooCache(); + final ZcStat stat = new ZcStat(); + + byte[] data = zc.get(mappingPath, stat); + if (stat.getMzxid() > lastMzxid) { + if (data == null) { + throw new IllegalStateException(mappingPath + " node should not be null"); + } + Map<String,String> idToName = deserializeMap(data); + if (namespaceId.equals(Namespace.ACCUMULO.id())) { + for (TableId tid : AccumuloTable.allTableIds()) { + if (!idToName.containsKey(tid.canonical())) { + throw new IllegalStateException("Built-in tables are not present in map"); + } + } + } + var converted = ImmutableSortedMap.<TableId,String>naturalOrder(); + var convertedReverse = ImmutableSortedMap.<String,TableId>naturalOrder(); + idToName.forEach((idString, name) -> { + var id = TableId.of(idString); + converted.put(id, name); + convertedReverse.put(name, id); + }); + currentTableMap = converted.build(); + currentTableReverseMap = convertedReverse.build(); + + lastMzxid = stat.getMzxid(); + } else if (data == null) { // If namespace happens to be deleted + currentTableMap = emptySortedMap(); + currentTableReverseMap = emptySortedMap(); + } + } + + public static String getZTableMapPath(NamespaceId namespaceId) { + return Constants.ZNAMESPACES + "/" + namespaceId + Constants.ZTABLES; + } + + private static boolean isBuiltInZKTable(TableId tableId) { + return AccumuloTable.allTableIds().contains(tableId); + } Review Comment: Fixed to check the namespaceid rather than the tableids. -- This is an automated message from the Apache Git Service. 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