Examples of org.apache.cassandra.io.sstable.Descriptor

org.apache.cassandra.io.sstable.Descriptor
A SSTable is described by the keyspace and column family it contains data for, a generation (where higher generations contain more recent data) and an alphabetic version string. A descriptor can be marked as temporary, which influences generated filenames.

        List<String> files = readLockfile(lockfile);
        for (String file : files)
        {
            try
            {
                Descriptor desc = Descriptor.fromFilename(file, true);
                SSTable.delete(desc, SSTable.componentsFor(desc));
            }
            catch (Exception e)
            {
                logger.warn("failed to delete a potentially stale sstable {}", file);

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        rm.add(new QueryPath("Indexed1", null, ByteBufferUtil.bytes("birthdate")), ByteBufferUtil.bytes(1L), 0);
        rm.apply();
        ColumnFamilyStore cfs = Table.open("Keyspace6").getColumnFamilyStore("Indexed1");
        cfs.forceBlockingFlush();
        ColumnFamilyStore indexedCfs = cfs.indexManager.getIndexForColumn(cfs.indexManager.getIndexedColumns().iterator().next()).getIndexCfs();
        Descriptor desc = indexedCfs.getSSTables().iterator().next().descriptor;


        // drop the index
        CFMetaData meta = cfs.metadata.clone();
        ColumnDefinition cdOld = meta.getColumn_metadata().values().iterator().next();
        ColumnDefinition cdNew = new ColumnDefinition(cdOld.name, cdOld.getValidator(), null, null, null, null);
        meta.columnMetadata(Collections.singletonMap(cdOld.name, cdNew));
        MigrationManager.announceColumnFamilyUpdate(meta);


        // check
        assert cfs.indexManager.getIndexedColumns().isEmpty();
        SSTableDeletingTask.waitForDeletions();
        assert !new File(desc.filenameFor(Component.DATA)).exists();
    }

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    {
        ColumnFamilyStore cfs = insertKey1Key2();


        for (int version = 1; version <= 2; ++version)
        {
            Descriptor existing = new Descriptor(cfs.directories.getDirectoryForNewSSTables(1), "Keyspace2", "Standard1", version, false);
            Descriptor desc = new Descriptor(Directories.getBackupsDirectory(existing), "Keyspace2", "Standard1", version, false);
            for (Component c : new Component[]{ Component.DATA, Component.PRIMARY_INDEX, Component.FILTER, Component.STATS })
                assertTrue("can not find backedup file:" + desc.filenameFor(c), new File(desc.filenameFor(c)).exists());
        }
    }

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        Directories directories = Directories.create(table.name, columnFamily);
        Directories.SSTableLister lister = directories.sstableLister().includeBackups(true);
        List<Integer> generations = new ArrayList<Integer>();
        for (Map.Entry<Descriptor, Set<Component>> entry : lister.list().entrySet())
        {
            Descriptor desc = entry.getKey();
            generations.add(desc.generation);
            if (!desc.isCompatible())
                throw new RuntimeException(String.format("Can't open incompatible SSTable! Current version %s, found file: %s", Descriptor.CURRENT_VERSION, desc));
        }
        Collections.sort(generations);
        int value = (generations.size() > 0) ? (generations.get(generations.size() - 1)) : 0;

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        logger.debug("Removing compacted SSTable files from {} (see http://wiki.apache.org/cassandra/MemtableSSTable)", columnFamily);


        Directories directories = Directories.create(table, columnFamily);
        for (Map.Entry<Descriptor,Set<Component>> sstableFiles : directories.sstableLister().list().entrySet())
        {
            Descriptor desc = sstableFiles.getKey();
            Set<Component> components = sstableFiles.getValue();


            if (components.contains(Component.COMPACTED_MARKER) || desc.temporary)
            {
                try
                {
                    SSTable.delete(desc, components);
                }
                catch (IOException e)
                {
                    throw new IOError(e);
                }
                continue;
            }


            File dataFile = new File(desc.filenameFor(Component.DATA));
            if (components.contains(Component.DATA) && dataFile.length() > 0)
                // everything appears to be in order... moving on.
                continue;


            // missing the DATA file! all components are orphaned
            logger.warn("Removing orphans for {}: {}", desc, components);
            for (Component component : components)
            {
                try
                {
                    FileUtils.deleteWithConfirm(desc.filenameFor(component));
                }
                catch (IOException e)
                {
                    throw new IOError(e);
                }

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        Set<SSTableReader> newSSTables = new HashSet<SSTableReader>();


        Directories.SSTableLister lister = directories.sstableLister().skipCompacted(true).skipTemporary(true);
        for (Map.Entry<Descriptor, Set<Component>> entry : lister.list().entrySet())
        {
            Descriptor descriptor = entry.getKey();


            if (currentDescriptors.contains(descriptor))
                continue; // old (initialized) SSTable found, skipping
            if (descriptor.temporary) // in the process of being written
                continue;


            if (!descriptor.isCompatible())
                throw new RuntimeException(String.format("Can't open incompatible SSTable! Current version %s, found file: %s",
                                                         Descriptor.CURRENT_VERSION,
                                                         descriptor));


            Descriptor newDescriptor = new Descriptor(descriptor.version,
                                                      descriptor.directory,
                                                      descriptor.ksname,
                                                      descriptor.cfname,
                                                      fileIndexGenerator.incrementAndGet(),
                                                      false);

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        return getTempSSTablePath(location, version);
    }


    public String getTempSSTablePath(File directory, String version)
    {
        Descriptor desc = new Descriptor(version,
                                         directory,
                                         table.name,
                                         columnFamily,
                                         fileIndexGenerator.incrementAndGet(),
                                         true);
        return desc.filenameFor(Component.DATA);
    }

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    /** Translates remote files to local files by creating a local sstable per remote sstable. */
    public static PendingFile getContextMapping(PendingFile remote) throws IOException
    {
        /* Create a local sstable for each remote sstable */
        Descriptor remotedesc = remote.desc;
        if (!remotedesc.isStreamCompatible())
            throw new UnsupportedOperationException(String.format("SSTable %s is not compatible with current version %s",
                                                                  remote.getFilename(), Descriptor.CURRENT_VERSION));


        // new local sstable
        Table table = Table.open(remotedesc.ksname);
        ColumnFamilyStore cfStore = table.getColumnFamilyStore(remotedesc.cfname);
        Descriptor localdesc = Descriptor.fromFilename(cfStore.getFlushPath(remote.size, remote.desc.version));


        return new PendingFile(localdesc, remote);
    }

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    private static List<PendingFile> createPendingFiles(Iterable<SSTableReader> sstables, Collection<Range<Token>> ranges, OperationType type)
    {
        List<PendingFile> pending = new ArrayList<PendingFile>();
        for (SSTableReader sstable : sstables)
        {
            Descriptor desc = sstable.descriptor;
            List<Pair<Long,Long>> sections = sstable.getPositionsForRanges(ranges);
            if (sections.isEmpty())
            {
                // A reference was acquired on the sstable and we won't stream it
                sstable.releaseReference();

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        Directories directories = Directories.create(table.name, columnFamily);
        Directories.SSTableLister lister = directories.sstableLister().includeBackups(true);
        List<Integer> generations = new ArrayList<Integer>();
        for (Map.Entry<Descriptor, Set<Component>> entry : lister.list().entrySet())
        {
            Descriptor desc = entry.getKey();
            generations.add(desc.generation);
            if (!desc.isCompatible())
                throw new RuntimeException(String.format("Can't open incompatible SSTable! Current version %s, found file: %s", Descriptor.Version.CURRENT, desc));
        }
        Collections.sort(generations);
        int value = (generations.size() > 0) ? (generations.get(generations.size() - 1)) : 0;

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