dracarys09 commented on code in PR #4581: URL: https://github.com/apache/cassandra/pull/4581#discussion_r2809342054
########## src/java/org/apache/cassandra/tools/TCMDump.java: ########## @@ -0,0 +1,539 @@ +/* + * 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.tools; + +import java.io.IOException; +import java.nio.file.FileVisitResult; +import java.nio.file.Files; +import java.nio.file.Path; +import java.nio.file.SimpleFileVisitor; +import java.nio.file.attribute.BasicFileAttributes; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import com.google.common.annotations.VisibleForTesting; +import com.google.common.collect.ImmutableList; + +import org.apache.cassandra.config.DatabaseDescriptor; +import org.apache.cassandra.db.ColumnFamilyStore; +import org.apache.cassandra.db.Keyspace; +import org.apache.cassandra.db.SystemKeyspace; +import org.apache.cassandra.io.util.FileOutputStreamPlus; +import org.apache.cassandra.schema.DistributedMetadataLogKeyspace; +import org.apache.cassandra.schema.Keyspaces; +import org.apache.cassandra.schema.Schema; +import org.apache.cassandra.schema.SchemaConstants; +import org.apache.cassandra.tcm.ClusterMetadata; +import org.apache.cassandra.tcm.ClusterMetadataService; +import org.apache.cassandra.tcm.Epoch; +import org.apache.cassandra.tcm.MetadataSnapshots; +import org.apache.cassandra.tcm.log.Entry; +import org.apache.cassandra.tcm.log.LogReader; +import org.apache.cassandra.tcm.log.LogState; +import org.apache.cassandra.tcm.log.SystemKeyspaceStorage; +import org.apache.cassandra.tcm.membership.NodeVersion; +import org.apache.cassandra.tcm.serialization.VerboseMetadataSerializer; + +import picocli.CommandLine; +import picocli.CommandLine.Command; +import picocli.CommandLine.Option; + +import static com.google.common.base.Throwables.getStackTraceAsString; + +/** + * Standalone tool to dump Transactional Cluster Metadata (TCM) from local SSTables. + * <p> + * This is an emergency recovery tool for debugging when a Cassandra instance cannot + * start due to TCM issues. It reads the local_metadata_log and metadata_snapshots + * tables from the system keyspace to reconstruct and display the cluster metadata state. + * <p> + * Usage: + * <pre> + * # Binary dump (default) + * tcmdump dump --data-dir /path/to/data + * + * # toString output for debugging + * tcmdump dump --data-dir /path/to/data --to-string + * + * # Dump log entries + * tcmdump dump --data-dir /path/to/data --dump-log --from-epoch 1 --to-epoch 50 + * + * # Dump distributed log (CMS nodes) + * tcmdump dump --data-dir /path/to/data --dump-distributed-log + * </pre> + */ +@Command(name = "tcmdump", +mixinStandardHelpOptions = true, +description = "Dump Transactional Cluster Metadata from local SSTables", +subcommands = { TCMDump.DumpMetadata.class }) +public class TCMDump implements Runnable +{ + private static final Output output = Output.CONSOLE; + + public static void main(String... args) + { + Util.initDatabaseDescriptor(); + + CommandLine cli = new CommandLine(TCMDump.class).setExecutionExceptionHandler((ex, cmd, parseResult) -> { + err(ex); + return 2; + }); + int status = cli.execute(args); + System.exit(status); + } + + protected static void err(Throwable e) + { + output.err.println("error: " + e.getMessage()); + output.err.println("-- StackTrace --"); + output.err.println(getStackTraceAsString(e)); + } + + @Override + public void run() + { + CommandLine.usage(this, output.out); + } + + @Command(name = "dump", description = "Dump cluster metadata from SSTables") Review Comment: Done -- 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] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
