Example usage for org.apache.cassandra.io.sstable.metadata MetadataType STATS

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In this page you can find the example usage for org.apache.cassandra.io.sstable.metadata MetadataType STATS.

Prototype

MetadataType STATS

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Document

Metadata always keep in memory

Usage

From source file:com.wenyu.cassandra.tools.SSTableLevelToZero.java

License:Apache License

/**
 * @param args a list of sstables whose metadata we are changing
 *///from   w  w  w  .j  a  va2  s  .co  m
public static void main(String[] args) throws IOException {
    PrintStream out = System.out;
    if (args.length < 3) {
        out.println("This command should be run with Cassandra stopped!");
        out.println("Usage: sstableleveltozero <keyspace> <columnfamily> <sstablefiles_fullpath>");
        System.exit(1);
    }

    // TODO several daemon threads will run from here.
    // So we have to explicitly call System.exit.
    try {
        // load keyspace descriptions.
        DatabaseDescriptor.loadSchemas();

        String keyspaceName = args[0];
        String columnfamily = args[1];
        String sstables = args[2];

        Set<String> sstableSet = new HashSet<>();
        for (String sstable : sstables.split(",")) {
            sstable = sstable.trim();
            if (sstable.length() == 0) {
                continue;
            }
            sstableSet.add(sstable);
        }

        // 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<Descriptor, Set<Component>> sstable : cfs.directories.sstableLister().list()
                .entrySet()) {
            if (sstable.getValue().contains(Component.STATS)) {
                foundSSTable = true;
                Descriptor descriptor = sstable.getKey();

                StatsMetadata metadata = (StatsMetadata) descriptor.getMetadataSerializer()
                        .deserialize(descriptor, MetadataType.STATS);
                String path = descriptor.filenameFor(Component.DATA);
                if (metadata.sstableLevel > 0 && sstableSet.contains(path)) {
                    out.println("Changing level from " + metadata.sstableLevel + " to 0 on "
                            + descriptor.filenameFor(Component.DATA));
                    descriptor.getMetadataSerializer().mutateLevel(descriptor, 0);
                } else if (metadata.sstableLevel <= 0 && sstableSet.contains(path)) {
                    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/columnfamily?");
        }
    } catch (Throwable t) {
        JVMStabilityInspector.inspectThrowable(t);
        t.printStackTrace();
        System.exit(1);
    }
    System.exit(0);
}

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