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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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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.nodetool;

import io.airlift.command.Arguments;
import io.airlift.command.Command;
import io.airlift.command.Option;

import java.util.ArrayList;
import java.util.List;

import org.apache.cassandra.tools.NodeProbe;
import org.apache.cassandra.tools.NodeTool.NodeToolCmd;

@Command(name = "garbagecollect", description = "Remove deleted data from one or more tables")
public class GarbageCollect extends NodeToolCmd
{
    @Arguments(usage = "[ ...]", description = "The keyspace followed by one or many tables")
    private List args = new ArrayList<>();

    @Option(title = "granularity",
        name = {"-g", "--granularity"},
        allowedValues = {"ROW", "CELL"},
        description = "Granularity of garbage removal. ROW (default) removes deleted partitions and rows, CELL also removes overwritten or deleted cells.")
    private String tombstoneOption = "ROW";

    @Option(title = "jobs",
            name = {"-j", "--jobs"},
            description = "Number of sstables to cleanup simultanously, set to 0 to use all available compaction " +
                          "threads. Defaults to 1 so that collections of newer tables can see the data is deleted " +
                          "and also remove tombstones.")
    private int jobs = 1;

    @Override
    public void execute(NodeProbe probe)
    {
        List keyspaces = parseOptionalKeyspace(args, probe);
        String[] tableNames = parseOptionalTables(args);

        for (String keyspace : keyspaces)
        {
            try
            {
                probe.garbageCollect(probe.output().out, tombstoneOption, jobs, keyspace, tableNames);
            } catch (Exception e)
            {
                throw new RuntimeException("Error occurred during garbage collection", e);
            }
        }
    }
}