jacek-lewandowski commented on code in PR #2807: URL: https://github.com/apache/cassandra/pull/2807#discussion_r1364080764
########## src/java/org/apache/cassandra/tcm/ClusterMetadata.java: ########## @@ -0,0 +1,986 @@ +/* + * 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.cassandra.tcm; + +import java.io.IOException; +import java.nio.ByteBuffer; +import java.util.ArrayList; +import java.util.Collection; +import java.util.HashMap; +import java.util.HashSet; +import java.util.List; +import java.util.Map; +import java.util.Objects; +import java.util.Set; + +import com.google.common.annotations.VisibleForTesting; +import com.google.common.collect.ImmutableMap; +import com.google.common.collect.ImmutableSet; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import org.apache.cassandra.config.CassandraRelevantProperties; +import org.apache.cassandra.config.DatabaseDescriptor; +import org.apache.cassandra.db.TypeSizes; +import org.apache.cassandra.dht.IPartitioner; +import org.apache.cassandra.dht.Range; +import org.apache.cassandra.dht.Token; +import org.apache.cassandra.io.util.DataInputBuffer; +import org.apache.cassandra.io.util.DataInputPlus; +import org.apache.cassandra.io.util.DataOutputBuffer; +import org.apache.cassandra.io.util.DataOutputPlus; +import org.apache.cassandra.locator.EndpointsForToken; +import org.apache.cassandra.locator.InetAddressAndPort; +import org.apache.cassandra.locator.Replica; +import org.apache.cassandra.schema.DistributedSchema; +import org.apache.cassandra.schema.KeyspaceMetadata; +import org.apache.cassandra.schema.Keyspaces; +import org.apache.cassandra.schema.ReplicationParams; +import org.apache.cassandra.tcm.extensions.ExtensionKey; +import org.apache.cassandra.tcm.extensions.ExtensionValue; +import org.apache.cassandra.tcm.listeners.MetadataSnapshotListener; +import org.apache.cassandra.tcm.log.LocalLog; +import org.apache.cassandra.tcm.membership.Directory; +import org.apache.cassandra.tcm.membership.Location; +import org.apache.cassandra.tcm.membership.NodeAddresses; +import org.apache.cassandra.tcm.membership.NodeId; +import org.apache.cassandra.tcm.membership.NodeState; +import org.apache.cassandra.tcm.membership.NodeVersion; +import org.apache.cassandra.tcm.ownership.DataPlacement; +import org.apache.cassandra.tcm.ownership.DataPlacements; +import org.apache.cassandra.tcm.ownership.PrimaryRangeComparator; +import org.apache.cassandra.tcm.ownership.PlacementForRange; +import org.apache.cassandra.tcm.ownership.TokenMap; +import org.apache.cassandra.tcm.ownership.VersionedEndpoints; +import org.apache.cassandra.tcm.sequences.BootstrapAndJoin; +import org.apache.cassandra.tcm.sequences.InProgressSequences; +import org.apache.cassandra.tcm.sequences.LockedRanges; +import org.apache.cassandra.tcm.serialization.MetadataSerializer; +import org.apache.cassandra.tcm.serialization.VerboseMetadataSerializer; +import org.apache.cassandra.tcm.serialization.Version; +import org.apache.cassandra.utils.FBUtilities; +import org.apache.cassandra.utils.Pair; +import org.apache.cassandra.utils.vint.VIntCoding; + +import static org.apache.cassandra.config.CassandraRelevantProperties.LINE_SEPARATOR; +import static org.apache.cassandra.db.TypeSizes.sizeof; + +/** + * Represents all transactional metadata of the cluster. It is versioned, immutable and serializable. + * CMS guarantees that all the nodes in the cluster see the same cluster metadata for the given epoch. + * When the metadata gets updated by a node, the new version must be associated with the new epoch. + * + * Epochs are groupped into periods. The number of epoch that can fit into a period is defined by + * {@link DatabaseDescriptor#getMetadataSnapshotFrequency()}. When a period is completed, its number is incremented by + * {@link LocalLog#snapshotListener()}, and then, a snapshot is created by the {@link MetadataSnapshotListener}. + * Both are triggered by the {@link LocalLog#processPendingInternal()} method, which processes the log entries. + * + * @see MetadataSnapshots for more information about cluster metadata snapshots + */ +public class ClusterMetadata +{ + public static final Serializer serializer = new Serializer(); + + public final Epoch epoch; + public final long period; + public final boolean lastInPeriod; + public final IPartitioner partitioner; // Set during (initial) construction and not modifiable via Transformer Review Comment: so is it there just for validation that all nodes has the same partitioner? -- 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. 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