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/*
 * 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.PrintStream;
import java.util.Map;
import java.util.Set;

import org.apache.cassandra.config.Schema;
import org.apache.cassandra.db.ColumnFamilyStore;
import org.apache.cassandra.db.Directories;
import org.apache.cassandra.db.Keyspace;
import org.apache.cassandra.io.sstable.Component;
import org.apache.cassandra.io.sstable.Descriptor;
import org.apache.cassandra.io.sstable.metadata.MetadataType;
import org.apache.cassandra.io.sstable.metadata.StatsMetadata;
import org.apache.cassandra.utils.JVMStabilityInspector;

/**
 * Reset level to 0 on a given set of sstables
 */
public class SSTableLevelResetter
{
    /**
     * @param args a list of sstables whose metadata we are changing
     */
    public static void main(String[] args)
    {
        PrintStream out = System.out;
        if (args.length == 0)
        {
            out.println("This command should be run with Cassandra stopped!");
            out.println("Usage: sstablelevelreset  ");
            System.exit(1);
        }

        if (!args[0].equals("--really-reset") || args.length != 3)
        {
            out.println("This command should be run with Cassandra stopped, otherwise you will get very strange behavior");
            out.println("Verify that Cassandra is not running and then execute the command like this:");
            out.println("Usage: sstablelevelreset --really-reset  
"); System.exit(1); } Util.initDatabaseDescriptor(); // TODO several daemon threads will run from here. // So we have to explicitly call System.exit. try { // load keyspace descriptions. Schema.instance.loadFromDisk(false); String keyspaceName = args[1]; String columnfamily = args[2]; // validate columnfamily if (Schema.instance.getCFMetaData(keyspaceName, columnfamily) == null) { System.err.println("ColumnFamily not found: " + keyspaceName + "/" + columnfamily); System.exit(1); } Keyspace keyspace = Keyspace.openWithoutSSTables(keyspaceName); ColumnFamilyStore cfs = keyspace.getColumnFamilyStore(columnfamily); boolean foundSSTable = false; for (Map.Entry> sstable : cfs.getDirectories().sstableLister(Directories.OnTxnErr.THROW).list().entrySet()) { if (sstable.getValue().contains(Component.STATS)) { foundSSTable = true; Descriptor descriptor = sstable.getKey(); StatsMetadata metadata = (StatsMetadata) descriptor.getMetadataSerializer().deserialize(descriptor, MetadataType.STATS); if (metadata.sstableLevel > 0) { out.println("Changing level from " + metadata.sstableLevel + " to 0 on " + descriptor.filenameFor(Component.DATA)); descriptor.getMetadataSerializer().mutateLevel(descriptor, 0); } else { out.println("Skipped " + descriptor.filenameFor(Component.DATA) + " since it is already on level 0"); } } } if (!foundSSTable) { out.println("Found no sstables, did you give the correct keyspace/table?"); } } catch (Throwable t) { JVMStabilityInspector.inspectThrowable(t); t.printStackTrace(); System.exit(1); } System.exit(0); } }