* 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.

*/

    private static final Logger logger = LoggerFactory.getLogger(DatabaseDescriptor.class);

    /**

     * Tokens are serialized in a Gossip VersionedValue String.  VV are restricted to 64KB

     * when we send them over the wire, which works out to about 1700 tokens.

     */

    private static final int MAX_NUM_TOKENS = 1536;

    private static IEndpointSnitch snitch;

    private static InetAddress listenAddress; // leave null so we can fall through to getLocalHost

    private static InetAddress broadcastAddress;

    private static InetAddress rpcAddress;

    private static InetAddress broadcastRpcAddress;

    private static SeedProvider seedProvider;

    private static IInternodeAuthenticator internodeAuthenticator;

    /* Hashing strategy Random or OPHF */

    private static IPartitioner partitioner;

    private static String paritionerName;

    private static Config.DiskAccessMode indexAccessMode;

    private static Config conf;

    private static SSTableFormat.Type sstable_format = SSTableFormat.Type.BIG;

    private static IAuthenticator authenticator = new AllowAllAuthenticator();

    private static IAuthorizer authorizer = new AllowAllAuthorizer();

    private static IRequestScheduler requestScheduler;

    private static RequestSchedulerId requestSchedulerId;

    private static RequestSchedulerOptions requestSchedulerOptions;

    private static long keyCacheSizeInMB;

    private static long counterCacheSizeInMB;

    private static IAllocator memoryAllocator;

    private static long indexSummaryCapacityInMB;

    private static String localDC;

    private static Comparator<InetAddress> localComparator;

    static

    {

        try

        {

            applyConfig(loadConfig());

        }

        catch (Exception e)

        {

            JVMStabilityInspector.inspectThrowable(e);

            throw new ExceptionInInitializerError(e.getMessage() + "\nFatal configuration error; unable to start. See log for stacktrace.");

        }

    }

    @VisibleForTesting

    public static Config loadConfig() throws ConfigurationException

    {

        String loaderClass = System.getProperty("cassandra.config.loader");

        ConfigurationLoader loader = loaderClass == null

                                   ? new YamlConfigurationLoader()

                                   : FBUtilities.<ConfigurationLoader>construct(loaderClass, "configuration loading");

        return loader.loadConfig();

    }

    private static void applyConfig(Config config) throws ConfigurationException

    {

        conf = config;

        if (conf.commitlog_sync == null)

        {

            throw new ConfigurationException("Missing required directive CommitLogSync");

        }

        if (conf.commitlog_sync == Config.CommitLogSync.batch)

        {

            if (conf.commitlog_sync_batch_window_in_ms == null)

            {

                throw new ConfigurationException("Missing value for commitlog_sync_batch_window_in_ms: Double expected.");

            }

            else if (conf.commitlog_sync_period_in_ms != null)

            {

                throw new ConfigurationException("Batch sync specified, but commitlog_sync_period_in_ms found. Only specify commitlog_sync_batch_window_in_ms when using batch sync");

            }

            logger.debug("Syncing log with a batch window of {}", conf.commitlog_sync_batch_window_in_ms);

        }

        else

        {

            if (conf.commitlog_sync_period_in_ms == null)

            {

                throw new ConfigurationException("Missing value for commitlog_sync_period_in_ms: Integer expected");

            }

            else if (conf.commitlog_sync_batch_window_in_ms != null)

            {

                throw new ConfigurationException("commitlog_sync_period_in_ms specified, but commitlog_sync_batch_window_in_ms found.  Only specify commitlog_sync_period_in_ms when using periodic sync.");

            }

            logger.debug("Syncing log with a period of {}", conf.commitlog_sync_period_in_ms);

        }

        if (conf.commitlog_total_space_in_mb == null)

            conf.commitlog_total_space_in_mb = hasLargeAddressSpace() ? 8192 : 32;

        if (FBUtilities.isUnix())

        {

            /* evaluate the DiskAccessMode Config directive, which also affects indexAccessMode selection */

            if (conf.disk_access_mode == Config.DiskAccessMode.auto)

            {

                conf.disk_access_mode = hasLargeAddressSpace() ? Config.DiskAccessMode.mmap : Config.DiskAccessMode.standard;

                indexAccessMode = conf.disk_access_mode;

                logger.info("DiskAccessMode 'auto' determined to be {}, indexAccessMode is {}", conf.disk_access_mode, indexAccessMode);

            }

            else if (conf.disk_access_mode == Config.DiskAccessMode.mmap_index_only)

            {

                conf.disk_access_mode = Config.DiskAccessMode.standard;

                indexAccessMode = Config.DiskAccessMode.mmap;

                logger.info("DiskAccessMode is {}, indexAccessMode is {}", conf.disk_access_mode, indexAccessMode);

            }

            else

            {

                indexAccessMode = conf.disk_access_mode;

                logger.info("DiskAccessMode is {}, indexAccessMode is {}", conf.disk_access_mode, indexAccessMode);

            }

        }

        // Always force standard mode access on Windows - CASSANDRA-6993. Windows won't allow deletion of hard-links to files that

        // are memory-mapped which causes trouble with snapshots.

        else

        {

            conf.disk_access_mode = Config.DiskAccessMode.standard;

            indexAccessMode = conf.disk_access_mode;

            logger.info("Non-unix environment detected.  DiskAccessMode set to {}, indexAccessMode {}", conf.disk_access_mode, indexAccessMode);

        }

        /* Authentication and authorization backend, implementing IAuthenticator and IAuthorizer */

        if (conf.authenticator != null)

            authenticator = FBUtilities.newAuthenticator(conf.authenticator);

        if (conf.authorizer != null)

            authorizer = FBUtilities.newAuthorizer(conf.authorizer);

        if (authenticator instanceof AllowAllAuthenticator && !(authorizer instanceof AllowAllAuthorizer))

            throw new ConfigurationException("AllowAllAuthenticator can't be used with " +  conf.authorizer);

        if (conf.internode_authenticator != null)

            internodeAuthenticator = FBUtilities.construct(conf.internode_authenticator, "internode_authenticator");

        else

            internodeAuthenticator = new AllowAllInternodeAuthenticator();

        authenticator.validateConfiguration();

        authorizer.validateConfiguration();

        internodeAuthenticator.validateConfiguration();

        /* Hashing strategy */

        if (conf.partitioner == null)

        {

            throw new ConfigurationException("Missing directive: partitioner");

        }

        try

        {

            partitioner = FBUtilities.newPartitioner(System.getProperty("cassandra.partitioner", conf.partitioner));

        }

        catch (Exception e)

        {

            throw new ConfigurationException("Invalid partitioner class " + conf.partitioner);

        }

        paritionerName = partitioner.getClass().getCanonicalName();

        if (conf.max_hint_window_in_ms == null)

        {

            throw new ConfigurationException("max_hint_window_in_ms cannot be set to null");

        }

        /* phi convict threshold for FailureDetector */

        if (conf.phi_convict_threshold < 5 || conf.phi_convict_threshold > 16)

        {

            throw new ConfigurationException("phi_convict_threshold must be between 5 and 16");

        }

        /* Thread per pool */

        if (conf.concurrent_reads != null && conf.concurrent_reads < 2)

        {

            throw new ConfigurationException("concurrent_reads must be at least 2");

        }

        if (conf.concurrent_writes != null && conf.concurrent_writes < 2)

        {

            throw new ConfigurationException("concurrent_writes must be at least 2");

        }

        if (conf.concurrent_counter_writes != null && conf.concurrent_counter_writes < 2)

            throw new ConfigurationException("concurrent_counter_writes must be at least 2");

        if (conf.concurrent_replicates != null)

            logger.warn("concurrent_replicates has been deprecated and should be removed from cassandra.yaml");

        if (conf.file_cache_size_in_mb == null)

            conf.file_cache_size_in_mb = Math.min(512, (int) (Runtime.getRuntime().maxMemory() / (4 * 1048576)));

        if (conf.memtable_offheap_space_in_mb == null)

            conf.memtable_offheap_space_in_mb = (int) (Runtime.getRuntime().maxMemory() / (4 * 1048576));

        if (conf.memtable_offheap_space_in_mb < 0)

            throw new ConfigurationException("memtable_offheap_space_in_mb must be positive");

        // for the moment, we default to twice as much on-heap space as off-heap, as heap overhead is very large

        if (conf.memtable_heap_space_in_mb == null)

            conf.memtable_heap_space_in_mb = (int) (Runtime.getRuntime().maxMemory() / (4 * 1048576));

        if (conf.memtable_heap_space_in_mb <= 0)

            throw new ConfigurationException("memtable_heap_space_in_mb must be positive");

        logger.info("Global memtable on-heap threshold is enabled at {}MB", conf.memtable_heap_space_in_mb);

        if (conf.memtable_offheap_space_in_mb == 0)

            logger.info("Global memtable off-heap threshold is disabled, HeapAllocator will be used instead");

        else

            logger.info("Global memtable off-heap threshold is enabled at {}MB", conf.memtable_offheap_space_in_mb);

        /* Local IP, hostname or interface to bind services to */

        if (conf.listen_address != null && conf.listen_interface != null)

        {

            throw new ConfigurationException("Set listen_address OR listen_interface, not both");

        }

        else if (conf.listen_address != null)

        {

            try

            {

                listenAddress = InetAddress.getByName(conf.listen_address);

            }

            catch (UnknownHostException e)

            {

                throw new ConfigurationException("Unknown listen_address '" + conf.listen_address + "'");

            }

            if (listenAddress.isAnyLocalAddress())

                throw new ConfigurationException("listen_address cannot be a wildcard address (" + conf.listen_address + ")!");

        }

        else if (conf.listen_interface != null)

        {

            try

            {

                Enumeration<InetAddress> addrs = NetworkInterface.getByName(conf.listen_interface).getInetAddresses();

                listenAddress = addrs.nextElement();

                if (addrs.hasMoreElements())

                    throw new ConfigurationException("Interface " + conf.listen_interface +" can't have more than one address");

            }

            catch (SocketException e)

            {

                throw new ConfigurationException("Unknown network interface in listen_interface " + conf.listen_interface);

            }

        }

        /* Gossip Address to broadcast */

        if (conf.broadcast_address != null)

        {

            try

            {

                broadcastAddress = InetAddress.getByName(conf.broadcast_address);

            }

            catch (UnknownHostException e)

            {

                throw new ConfigurationException("Unknown broadcast_address '" + conf.broadcast_address + "'");

            }

            if (broadcastAddress.isAnyLocalAddress())

                throw new ConfigurationException("broadcast_address cannot be a wildcard address (" + conf.broadcast_address + ")!");

        }

        /* Local IP, hostname or interface to bind RPC server to */

        if (conf.rpc_address != null && conf.rpc_interface != null)

        {

            throw new ConfigurationException("Set rpc_address OR rpc_interface, not both");

        }

        else if (conf.rpc_address != null)

        {

            try

            {

                rpcAddress = InetAddress.getByName(conf.rpc_address);

            }

            catch (UnknownHostException e)

            {

                throw new ConfigurationException("Unknown host in rpc_address " + conf.rpc_address);

            }

        }

        else if (conf.rpc_interface != null)

        {

            try

            {

                Enumeration<InetAddress> addrs = NetworkInterface.getByName(conf.rpc_interface).getInetAddresses();

                rpcAddress = addrs.nextElement();

                if (addrs.hasMoreElements())

                    throw new ConfigurationException("Interface " + conf.rpc_interface +" can't have more than one address");

            }

            catch (SocketException e)

            {

                throw new ConfigurationException("Unknown network interface in rpc_interface " + conf.rpc_interface);

            }

        }

        else

        {

            rpcAddress = FBUtilities.getLocalAddress();

        }

        /* RPC address to broadcast */

        if (conf.broadcast_rpc_address != null)

        {

            try

            {

                broadcastRpcAddress = InetAddress.getByName(conf.broadcast_rpc_address);

            }

            catch (UnknownHostException e)

            {

                throw new ConfigurationException("Unknown broadcast_rpc_address '" + conf.broadcast_rpc_address + "'");

            }

            if (broadcastRpcAddress.isAnyLocalAddress())

                throw new ConfigurationException("broadcast_rpc_address cannot be a wildcard address (" + conf.broadcast_rpc_address + ")!");

        }

        else

        {

            if (rpcAddress.isAnyLocalAddress())

                throw new ConfigurationException("If rpc_address is set to a wildcard address (" + conf.rpc_address + "), then " +

                                                 "you must set broadcast_rpc_address to a value other than " + conf.rpc_address);

            broadcastRpcAddress = rpcAddress;

        }

        if (conf.thrift_framed_transport_size_in_mb <= 0)

            throw new ConfigurationException("thrift_framed_transport_size_in_mb must be positive");

        if (conf.native_transport_max_frame_size_in_mb <= 0)

            throw new ConfigurationException("native_transport_max_frame_size_in_mb must be positive");

        // fail early instead of OOMing (see CASSANDRA-8116)

        if (ThriftServer.HSHA.equals(conf.rpc_server_type) && conf.rpc_max_threads == Integer.MAX_VALUE)

            throw new ConfigurationException("The hsha rpc_server_type is not compatible with an rpc_max_threads " +

                                             "setting of 'unlimited'.  Please see the comments in cassandra.yaml " +

                                             "for rpc_server_type and rpc_max_threads.");

        /* end point snitch */

        if (conf.endpoint_snitch == null)

        {

            throw new ConfigurationException("Missing endpoint_snitch directive");

        }

        snitch = createEndpointSnitch(conf.endpoint_snitch);

        EndpointSnitchInfo.create();

        localDC = snitch.getDatacenter(FBUtilities.getBroadcastAddress());

        localComparator = new Comparator<InetAddress>()

        {

            public int compare(InetAddress endpoint1, InetAddress endpoint2)

            {

                boolean local1 = localDC.equals(snitch.getDatacenter(endpoint1));

                boolean local2 = localDC.equals(snitch.getDatacenter(endpoint2));

                if (local1 && !local2)

                    return -1;

                if (local2 && !local1)

                    return 1;

                return 0;

            }

        };

        /* Request Scheduler setup */

        requestSchedulerOptions = conf.request_scheduler_options;

        if (conf.request_scheduler != null)

        {

            try

            {

                if (requestSchedulerOptions == null)

                {

                    requestSchedulerOptions = new RequestSchedulerOptions();

                }

                Class<?> cls = Class.forName(conf.request_scheduler);

                requestScheduler = (IRequestScheduler) cls.getConstructor(RequestSchedulerOptions.class).newInstance(requestSchedulerOptions);

            }

            catch (ClassNotFoundException e)

            {

                throw new ConfigurationException("Invalid Request Scheduler class " + conf.request_scheduler);

            }

            catch (Exception e)

            {

                throw new ConfigurationException("Unable to instantiate request scheduler", e);

            }

        }

        else

        {

            requestScheduler = new NoScheduler();

        }

        if (conf.request_scheduler_id == RequestSchedulerId.keyspace)

        {

            requestSchedulerId = conf.request_scheduler_id;

        }

        else

        {

            // Default to Keyspace

            requestSchedulerId = RequestSchedulerId.keyspace;

        }

        // if data dirs, commitlog dir, or saved caches dir are set in cassandra.yaml, use that.  Otherwise,

        // use -Dcassandra.storagedir (set in cassandra-env.sh) as the parent dir for data/, commitlog/, and saved_caches/

        if (conf.commitlog_directory == null)

        {

            conf.commitlog_directory = System.getProperty("cassandra.storagedir", null);

            if (conf.commitlog_directory == null)

                throw new ConfigurationException("commitlog_directory is missing and -Dcassandra.storagedir is not set");

            conf.commitlog_directory += File.separator + "commitlog";

        }

        if (conf.saved_caches_directory == null)

        {

            conf.saved_caches_directory = System.getProperty("cassandra.storagedir", null);

            if (conf.saved_caches_directory == null)

                throw new ConfigurationException("saved_caches_directory is missing and -Dcassandra.storagedir is not set");

            conf.saved_caches_directory += File.separator + "saved_caches";

        }

        if (conf.data_file_directories == null)

        {

            String defaultDataDir = System.getProperty("cassandra.storagedir", null);

            if (defaultDataDir == null)

                throw new ConfigurationException("data_file_directories is not missing and -Dcassandra.storagedir is not set");

            conf.data_file_directories = new String[]{ defaultDataDir + File.separator + "data" };

        }

        /* data file and commit log directories. they get created later, when they're needed. */

        for (String datadir : conf.data_file_directories)

        {

            if (datadir.equals(conf.commitlog_directory))

                throw new ConfigurationException("commitlog_directory must not be the same as any data_file_directories");

            if (datadir.equals(conf.saved_caches_directory))

                throw new ConfigurationException("saved_caches_directory must not be the same as any data_file_directories");

        }

        if (conf.commitlog_directory.equals(conf.saved_caches_directory))

            throw new ConfigurationException("saved_caches_directory must not be the same as the commitlog_directory");

        if (conf.memtable_flush_writers == null)

            conf.memtable_flush_writers = Math.min(8, Math.max(2, Math.min(FBUtilities.getAvailableProcessors(), conf.data_file_directories.length)));

        if (conf.memtable_flush_writers < 1)

            throw new ConfigurationException("memtable_flush_writers must be at least 1");

        if (conf.memtable_cleanup_threshold == null)

            conf.memtable_cleanup_threshold = (float) (1.0 / (1 + conf.memtable_flush_writers));

        if (conf.memtable_cleanup_threshold < 0.01f)

            throw new ConfigurationException("memtable_cleanup_threshold must be >= 0.01");

        if (conf.memtable_cleanup_threshold > 0.99f)

            throw new ConfigurationException("memtable_cleanup_threshold must be <= 0.99");

        if (conf.memtable_cleanup_threshold < 0.1f)

            logger.warn("memtable_cleanup_threshold is set very low, which may cause performance degradation");

        if (conf.concurrent_compactors == null)

            conf.concurrent_compactors = Math.min(8, Math.max(2, Math.min(FBUtilities.getAvailableProcessors(), conf.data_file_directories.length)));

        if (conf.concurrent_compactors <= 0)

            throw new ConfigurationException("concurrent_compactors should be strictly greater than 0");

        if (conf.initial_token != null)

            for (String token : tokensFromString(conf.initial_token))

                partitioner.getTokenFactory().validate(token);

        if (conf.num_tokens == null)

          conf.num_tokens = 1;

        else if (conf.num_tokens > MAX_NUM_TOKENS)

            throw new ConfigurationException(String.format("A maximum number of %d tokens per node is supported", MAX_NUM_TOKENS));

        try

        {

            // if key_cache_size_in_mb option was set to "auto" then size of the cache should be "min(5% of Heap (in MB), 100MB)

            keyCacheSizeInMB = (conf.key_cache_size_in_mb == null)

                ? Math.min(Math.max(1, (int) (Runtime.getRuntime().totalMemory() * 0.05 / 1024 / 1024)), 100)

                : conf.key_cache_size_in_mb;

            if (keyCacheSizeInMB < 0)

                throw new NumberFormatException(); // to escape duplicating error message

        }

        catch (NumberFormatException e)

        {

            throw new ConfigurationException("key_cache_size_in_mb option was set incorrectly to '"

                    + conf.key_cache_size_in_mb + "', supported values are <integer> >= 0.");

        }

        try

        {

            // if counter_cache_size_in_mb option was set to "auto" then size of the cache should be "min(2.5% of Heap (in MB), 50MB)

            counterCacheSizeInMB = (conf.counter_cache_size_in_mb == null)

                    ? Math.min(Math.max(1, (int) (Runtime.getRuntime().totalMemory() * 0.025 / 1024 / 1024)), 50)

                    : conf.counter_cache_size_in_mb;

            if (counterCacheSizeInMB < 0)

                throw new NumberFormatException(); // to escape duplicating error message

        }

        catch (NumberFormatException e)

        {

            throw new ConfigurationException("counter_cache_size_in_mb option was set incorrectly to '"

                    + conf.counter_cache_size_in_mb + "', supported values are <integer> >= 0.");

        }

        // if set to empty/"auto" then use 5% of Heap size

        indexSummaryCapacityInMB = (conf.index_summary_capacity_in_mb == null)

            ? Math.max(1, (int) (Runtime.getRuntime().totalMemory() * 0.05 / 1024 / 1024))

            : conf.index_summary_capacity_in_mb;

        if (indexSummaryCapacityInMB < 0)

            throw new ConfigurationException("index_summary_capacity_in_mb option was set incorrectly to '"

                    + conf.index_summary_capacity_in_mb + "', it should be a non-negative integer.");

        memoryAllocator = FBUtilities.newOffHeapAllocator(conf.memory_allocator);

        if(conf.encryption_options != null)

        {

            logger.warn("Please rename encryption_options as server_encryption_options in the yaml");

            //operate under the assumption that server_encryption_options is not set in yaml rather than both

            conf.server_encryption_options = conf.encryption_options;

        }

        // hardcoded system keyspace

        Schema.instance.load(SystemKeyspace.definition());

        // load the seeds for node contact points

        if (conf.seed_provider == null)

        {

            throw new ConfigurationException("seeds configuration is missing; a minimum of one seed is required.");

        }

        try

        {

            Class<?> seedProviderClass = Class.forName(conf.seed_provider.class_name);

            seedProvider = (SeedProvider)seedProviderClass.getConstructor(Map.class).newInstance(conf.seed_provider.parameters);

        }

        // there are about 5 checked exceptions that could be thrown here.

        catch (Exception e)

        {

            throw new ConfigurationException(e.getMessage() + "\nFatal configuration error; unable to start server.  See log for stacktrace.");

        }

        if (seedProvider.getSeeds().size() == 0)

            throw new ConfigurationException("The seed provider lists no seeds.");

        if (conf.batch_size_fail_threshold_in_kb == null)

        {

            conf.batch_size_fail_threshold_in_kb = conf.batch_size_warn_threshold_in_kb * 10;

        }

    }

    private static IEndpointSnitch createEndpointSnitch(String snitchClassName) throws ConfigurationException

    {

        if (!snitchClassName.contains("."))

            snitchClassName = "org.apache.cassandra.locator." + snitchClassName;

        IEndpointSnitch snitch = FBUtilities.construct(snitchClassName, "snitch");

        return conf.dynamic_snitch ? new DynamicEndpointSnitch(snitch) : snitch;

    }

    /** load keyspace (keyspace) definitions, but do not initialize the keyspace instances. */

    public static void loadSchemas()

    {

        ColumnFamilyStore schemaCFS = SystemKeyspace.schemaCFS(SystemKeyspace.SCHEMA_KEYSPACES_TABLE);

        // if keyspace with definitions is empty try loading the old way

        if (schemaCFS.estimateKeys() == 0)

        {

            logger.info("Couldn't detect any schema definitions in local storage.");

            // peek around the data directories to see if anything is there.

            if (hasExistingNoSystemTables())

                logger.info("Found keyspace data in data directories. Consider using cqlsh to define your schema.");

            else

                logger.info("To create keyspaces and column families, see 'help create' in cqlsh.");

        }

        else

        {

            Schema.instance.load(DefsTables.loadFromKeyspace());

        }

        Schema.instance.updateVersion();

    }

    private static boolean hasExistingNoSystemTables()

    {

        for (String dataDir : getAllDataFileLocations())

        {

            File dataPath = new File(dataDir);

            if (dataPath.exists() && dataPath.isDirectory())

            {

                // see if there are other directories present.

                int dirCount = dataPath.listFiles(new FileFilter()

                {

                    public boolean accept(File pathname)

                    {

                        return pathname.isDirectory() && !pathname.getName().equals(SystemKeyspace.NAME);

                    }

                }).length;

                if (dirCount > 0)

                    return true;

            }

        }

        return false;

    }

    public static IAuthenticator getAuthenticator()

    {

        return authenticator;

    }

    public static IAuthorizer getAuthorizer()

    {

        return authorizer;

    }

    public static int getPermissionsValidity()

    {

        return conf.permissions_validity_in_ms;

    }

    public static void setPermissionsValidity(int timeout)

    {

        conf.permissions_validity_in_ms = timeout;

    }

    public static int getThriftFramedTransportSize()

    {

        return conf.thrift_framed_transport_size_in_mb * 1024 * 1024;

    }

    /**

     * Creates all storage-related directories.

     */

    public static void createAllDirectories()

    {

        try

        {

            if (conf.data_file_directories.length == 0)

                throw new ConfigurationException("At least one DataFileDirectory must be specified");

            for (String dataFileDirectory : conf.data_file_directories)

            {

                FileUtils.createDirectory(dataFileDirectory);

            }

            if (conf.commitlog_directory == null)

                throw new ConfigurationException("commitlog_directory must be specified");

            FileUtils.createDirectory(conf.commitlog_directory);

            if (conf.saved_caches_directory == null)

                throw new ConfigurationException("saved_caches_directory must be specified");

            FileUtils.createDirectory(conf.saved_caches_directory);

        }

        catch (ConfigurationException e)

        {

            throw new IllegalArgumentException("Bad configuration; unable to start server: "+e.getMessage());

        }

        catch (FSWriteError e)

        {

            throw new IllegalStateException(e.getCause().getMessage() + "; unable to start server");

        }

    }

    public static IPartitioner getPartitioner()

    {

        return partitioner;

    }

    public static String getPartitionerName()

    {

        return paritionerName;

    }

    /* For tests ONLY, don't use otherwise or all hell will break loose */

    public static void setPartitioner(IPartitioner newPartitioner)

    {

        partitioner = newPartitioner;

    }

    public static IEndpointSnitch getEndpointSnitch()

    {

        return snitch;

    }

    public static void setEndpointSnitch(IEndpointSnitch eps)

    {

        snitch = eps;

    }

    public static IRequestScheduler getRequestScheduler()

    {

        return requestScheduler;

    }

    public static RequestSchedulerOptions getRequestSchedulerOptions()

    {

        return requestSchedulerOptions;

    }

    public static RequestSchedulerId getRequestSchedulerId()

    {

        return requestSchedulerId;

    }

    public static int getColumnIndexSize()

    {

        return conf.column_index_size_in_kb * 1024;

    }

    public static int getBatchSizeWarnThreshold()

    {

        return conf.batch_size_warn_threshold_in_kb * 1024;

    }

    public static long getBatchSizeFailThreshold()

    {

        return conf.batch_size_fail_threshold_in_kb * 1024L;

    }

    public static int getBatchSizeFailThresholdInKB()

    {

        return conf.batch_size_fail_threshold_in_kb;

    }

    public static void setBatchSizeFailThresholdInKB(int threshold)

    {

        conf.batch_size_fail_threshold_in_kb = threshold;

    }

    public static Collection<String> getInitialTokens()

    {

        return tokensFromString(System.getProperty("cassandra.initial_token", conf.initial_token));

    }

    public static Collection<String> tokensFromString(String tokenString)

    {

        List<String> tokens = new ArrayList<String>();

        if (tokenString != null)

            for (String token : tokenString.split(","))

                tokens.add(token.replaceAll("^\\s+", "").replaceAll("\\s+$", ""));

        return tokens;

    }

    public static Integer getNumTokens()

    {

        return conf.num_tokens;

    }

    public static InetAddress getReplaceAddress()

    {

        try

        {

            if (System.getProperty("cassandra.replace_address", null) != null)

                return InetAddress.getByName(System.getProperty("cassandra.replace_address", null));

            else if (System.getProperty("cassandra.replace_address_first_boot", null) != null)

                return InetAddress.getByName(System.getProperty("cassandra.replace_address_first_boot", null));

            return null;

        }

        catch (UnknownHostException e)

        {

            return null;

        }

    }

    public static Collection<String> getReplaceTokens()

    {

        return tokensFromString(System.getProperty("cassandra.replace_token", null));

    }

    public static UUID getReplaceNode()

    {

        try

        {

            return UUID.fromString(System.getProperty("cassandra.replace_node", null));

        } catch (NullPointerException e)

        {

            return null;

        }

    }

    public static boolean isReplacing()

    {

        if (System.getProperty("cassandra.replace_address_first_boot", null) != null && SystemKeyspace.bootstrapComplete())

        {

            logger.info("Replace address on first boot requested; this node is already bootstrapped");

            return false;

        }

        return getReplaceAddress() != null;

    }

    public static String getClusterName()

    {

        return conf.cluster_name;

    }

    public static int getMaxStreamingRetries()

    {

        return conf.max_streaming_retries;

    }

    public static int getStoragePort()

    {

        return Integer.parseInt(System.getProperty("cassandra.storage_port", conf.storage_port.toString()));

    }

    public static int getSSLStoragePort()

    {

        return Integer.parseInt(System.getProperty("cassandra.ssl_storage_port", conf.ssl_storage_port.toString()));

    }

    public static int getRpcPort()

    {

        return Integer.parseInt(System.getProperty("cassandra.rpc_port", conf.rpc_port.toString()));

    }

    public static int getRpcListenBacklog()

    {

        return conf.rpc_listen_backlog;

    }

    public static long getRpcTimeout()

    {

        return conf.request_timeout_in_ms;

    }

    public static void setRpcTimeout(Long timeOutInMillis)

    {

        conf.request_timeout_in_ms = timeOutInMillis;

    }

    public static long getReadRpcTimeout()

    {

        return conf.read_request_timeout_in_ms;

    }

    public static void setReadRpcTimeout(Long timeOutInMillis)

    {

        conf.read_request_timeout_in_ms = timeOutInMillis;

    }

    public static long getRangeRpcTimeout()

    {

        return conf.range_request_timeout_in_ms;

    }

    public static void setRangeRpcTimeout(Long timeOutInMillis)

    {

        conf.range_request_timeout_in_ms = timeOutInMillis;

    }

    public static long getWriteRpcTimeout()

    {

        return conf.write_request_timeout_in_ms;

    }

    public static void setWriteRpcTimeout(Long timeOutInMillis)

    {

        conf.write_request_timeout_in_ms = timeOutInMillis;

    }

    public static long getCounterWriteRpcTimeout()

    {

        return conf.counter_write_request_timeout_in_ms;

    }

    public static void setCounterWriteRpcTimeout(Long timeOutInMillis)

    {

        conf.counter_write_request_timeout_in_ms = timeOutInMillis;

    }

    public static long getCasContentionTimeout()

    {

        return conf.cas_contention_timeout_in_ms;

    }

    public static void setCasContentionTimeout(Long timeOutInMillis)

    {

        conf.cas_contention_timeout_in_ms = timeOutInMillis;

    }

    public static long getTruncateRpcTimeout()

    {

        return conf.truncate_request_timeout_in_ms;

    }

    public static void setTruncateRpcTimeout(Long timeOutInMillis)

    {

        conf.truncate_request_timeout_in_ms = timeOutInMillis;

    }

    public static boolean hasCrossNodeTimeout()

    {

        return conf.cross_node_timeout;

    }

    // not part of the Verb enum so we can change timeouts easily via JMX

    public static long getTimeout(MessagingService.Verb verb)

    {

        switch (verb)

        {

            case READ:

                return getReadRpcTimeout();

            case RANGE_SLICE:

                return getRangeRpcTimeout();

            case TRUNCATE:

                return getTruncateRpcTimeout();

            case READ_REPAIR:

            case MUTATION:

            case PAXOS_COMMIT:

            case PAXOS_PREPARE:

            case PAXOS_PROPOSE:

                return getWriteRpcTimeout();

            case COUNTER_MUTATION:

                return getCounterWriteRpcTimeout();

            default:

                return getRpcTimeout();

        }

    }

    /**

     * @return the minimum configured {read, write, range, truncate, misc} timeout

     */

    public static long getMinRpcTimeout()

    {

        return Longs.min(getRpcTimeout(),

                         getReadRpcTimeout(),

                         getRangeRpcTimeout(),

                         getWriteRpcTimeout(),

                         getCounterWriteRpcTimeout(),

                         getTruncateRpcTimeout());

    }

    public static double getPhiConvictThreshold()

    {

        return conf.phi_convict_threshold;

    }

    public static void setPhiConvictThreshold(double phiConvictThreshold)

    {

        conf.phi_convict_threshold = phiConvictThreshold;

    }

    public static int getConcurrentReaders()

    {

        return conf.concurrent_reads;

    }

    public static int getConcurrentWriters()

    {

        return conf.concurrent_writes;

    }

    public static int getConcurrentCounterWriters()

    {

        return conf.concurrent_counter_writes;

    }

    public static int getFlushWriters()

    {

            return conf.memtable_flush_writers;

    }

    public static int getConcurrentCompactors()

    {

        return conf.concurrent_compactors;

    }

    public static int getCompactionThroughputMbPerSec()

    {

        return conf.compaction_throughput_mb_per_sec;

    }

    public static void setCompactionThroughputMbPerSec(int value)

    {

        conf.compaction_throughput_mb_per_sec = value;

    }

    public static boolean getDisableSTCSInL0()

    {

        return Boolean.getBoolean("cassandra.disable_stcs_in_l0");

    }

    public static int getStreamThroughputOutboundMegabitsPerSec()

    {

        return conf.stream_throughput_outbound_megabits_per_sec;

    }

    public static void setStreamThroughputOutboundMegabitsPerSec(int value)

    {

        conf.stream_throughput_outbound_megabits_per_sec = value;

    }

    public static int getInterDCStreamThroughputOutboundMegabitsPerSec()

    {

        return conf.inter_dc_stream_throughput_outbound_megabits_per_sec;

    }

    public static void setInterDCStreamThroughputOutboundMegabitsPerSec(int value)

    {

        conf.inter_dc_stream_throughput_outbound_megabits_per_sec = value;

    }

    public static String[] getAllDataFileLocations()

    {

        return conf.data_file_directories;

    }

    public static String getCommitLogLocation()

    {

        return conf.commitlog_directory;

    }

    public static int getTombstoneWarnThreshold()

    {

        return conf.tombstone_warn_threshold;

    }

    public static void setTombstoneWarnThreshold(int threshold)

    {

        conf.tombstone_warn_threshold = threshold;

    }

    public static int getTombstoneFailureThreshold()

    {

        return conf.tombstone_failure_threshold;

    }

    public static void setTombstoneFailureThreshold(int threshold)

    {

        conf.tombstone_failure_threshold = threshold;

    }

    /**

     * size of commitlog segments to allocate

     */

    public static int getCommitLogSegmentSize()

    {

        return conf.commitlog_segment_size_in_mb * 1024 * 1024;

    }

    public static String getSavedCachesLocation()

    {

        return conf.saved_caches_directory;

    }

    public static Set<InetAddress> getSeeds()

    {

        return ImmutableSet.<InetAddress>builder().addAll(seedProvider.getSeeds()).build();

    }

    public static InetAddress getListenAddress()

    {

        return listenAddress;

    }

    public static InetAddress getBroadcastAddress()

    {

        return broadcastAddress;

    }

    public static IInternodeAuthenticator getInternodeAuthenticator()

    {

        return internodeAuthenticator;

    }

    public static void setBroadcastAddress(InetAddress broadcastAdd)

    {

        broadcastAddress = broadcastAdd;

    }

    public static boolean startRpc()

    {

        return conf.start_rpc;

    }

    public static InetAddress getRpcAddress()

    {

        return rpcAddress;

    }

    public static void setBroadcastRpcAddress(InetAddress broadcastRPCAddr)

    {

        broadcastRpcAddress = broadcastRPCAddr;

    }

    public static InetAddress getBroadcastRpcAddress()

    {

        return broadcastRpcAddress;

    }

    public static String getRpcServerType()

    {

        return conf.rpc_server_type;

    }

    public static boolean getRpcKeepAlive()

    {

        return conf.rpc_keepalive;

    }

    public static Integer getRpcMinThreads()

    {

        return conf.rpc_min_threads;

    }

    public static Integer getRpcMaxThreads()

    {

        return conf.rpc_max_threads;

    }

    public static Integer getRpcSendBufferSize()

    {

        return conf.rpc_send_buff_size_in_bytes;

    }

    public static Integer getRpcRecvBufferSize()

    {

        return conf.rpc_recv_buff_size_in_bytes;

    }

    public static Integer getInternodeSendBufferSize()

    {

        return conf.internode_send_buff_size_in_bytes;

    }

    public static Integer getInternodeRecvBufferSize()

    {

        return conf.internode_recv_buff_size_in_bytes;

    }

    public static boolean startNativeTransport()

    {

        return conf.start_native_transport;

    }

    public static int getNativeTransportPort()

    {

        return Integer.parseInt(System.getProperty("cassandra.native_transport_port", conf.native_transport_port.toString()));

    }

    public static Integer getNativeTransportMaxThreads()

    {

        return conf.native_transport_max_threads;

    }

    public static int getNativeTransportMaxFrameSize()

    {

        return conf.native_transport_max_frame_size_in_mb * 1024 * 1024;

    }

    public static double getCommitLogSyncBatchWindow()

    {

        return conf.commitlog_sync_batch_window_in_ms;

    }

    public static int getCommitLogSyncPeriod()

    {

        return conf.commitlog_sync_period_in_ms;

    }

    public static int getCommitLogPeriodicQueueSize()

    {

        return conf.commitlog_periodic_queue_size;

    }

    public static Config.CommitLogSync getCommitLogSync()

    {

        return conf.commitlog_sync;

    }

    public static Config.DiskAccessMode getDiskAccessMode()

    {

        return conf.disk_access_mode;

    }

    public static Config.DiskAccessMode getIndexAccessMode()

    {

        return indexAccessMode;

    }

    public static void setDiskFailurePolicy(Config.DiskFailurePolicy policy)

    {

        conf.disk_failure_policy = policy;

    }

    public static Config.DiskFailurePolicy getDiskFailurePolicy()

    {

        return conf.disk_failure_policy;

    }

    public static void setCommitFailurePolicy(Config.CommitFailurePolicy policy)

    {

        conf.commit_failure_policy = policy;

    }

    public static Config.CommitFailurePolicy getCommitFailurePolicy()

    {

        return conf.commit_failure_policy;

    }

    public static boolean isSnapshotBeforeCompaction()

    {

        return conf.snapshot_before_compaction;

    }

    public static boolean isAutoSnapshot() {

        return conf.auto_snapshot;

    }

    @VisibleForTesting

    public static void setAutoSnapshot(boolean autoSnapshot) {

        conf.auto_snapshot = autoSnapshot;

    }

    public static boolean isAutoBootstrap()

    {

        return Boolean.parseBoolean(System.getProperty("cassandra.auto_bootstrap", conf.auto_bootstrap.toString()));

    }

    public static void setHintedHandoffEnabled(boolean hintedHandoffEnabled)

    {

        conf.hinted_handoff_enabled_global = hintedHandoffEnabled;

        conf.hinted_handoff_enabled_by_dc.clear();

    }

    public static void setHintedHandoffEnabled(final String dcNames)

    {

        List<String> dcNameList;

        try

        {

            dcNameList = Config.parseHintedHandoffEnabledDCs(dcNames);

        }

        catch (IOException e)

        {

            throw new IllegalArgumentException("Could not read csv of dcs for hinted handoff enable. " + dcNames, e);

        }

        if (dcNameList.isEmpty())

            throw new IllegalArgumentException("Empty list of Dcs for hinted handoff enable");

        conf.hinted_handoff_enabled_by_dc.clear();

        conf.hinted_handoff_enabled_by_dc.addAll(dcNameList);

    }

    public static boolean hintedHandoffEnabled()

    {

        return conf.hinted_handoff_enabled_global;

    }

    public static Set<String> hintedHandoffEnabledByDC()

    {

        return Collections.unmodifiableSet(conf.hinted_handoff_enabled_by_dc);

    }

    public static boolean shouldHintByDC()

    {

        return !conf.hinted_handoff_enabled_by_dc.isEmpty();

    }

    public static boolean hintedHandoffEnabled(final String dcName)

    {

        return conf.hinted_handoff_enabled_by_dc.contains(dcName);

    }

    public static void setMaxHintWindow(int ms)

    {

        conf.max_hint_window_in_ms = ms;

    }

    public static int getMaxHintWindow()

    {

        return conf.max_hint_window_in_ms;

    }

    public static File getSerializedCachePath(String ksName, String cfName, UUID cfId, CacheService.CacheType cacheType, String version)

    {

        StringBuilder builder = new StringBuilder();

        builder.append(ksName).append('-');

        builder.append(cfName).append('-');

        builder.append(ByteBufferUtil.bytesToHex(ByteBufferUtil.bytes(cfId))).append('-');

        builder.append(cacheType);

        builder.append((version == null ? "" : "-" + version + ".db"));

        return new File(conf.saved_caches_directory, builder.toString());

    }

    public static int getDynamicUpdateInterval()

    {

        return conf.dynamic_snitch_update_interval_in_ms;

    }

    public static void setDynamicUpdateInterval(Integer dynamicUpdateInterval)

    {

        conf.dynamic_snitch_update_interval_in_ms = dynamicUpdateInterval;

    }

    public static int getDynamicResetInterval()

    {

        return conf.dynamic_snitch_reset_interval_in_ms;

    }

    public static void setDynamicResetInterval(Integer dynamicResetInterval)

    {

        conf.dynamic_snitch_reset_interval_in_ms = dynamicResetInterval;

    }

    public static double getDynamicBadnessThreshold()

    {

        return conf.dynamic_snitch_badness_threshold;

    }

    public static void setDynamicBadnessThreshold(Double dynamicBadnessThreshold)

    {

        conf.dynamic_snitch_badness_threshold = dynamicBadnessThreshold;

    }

    public static ServerEncryptionOptions getServerEncryptionOptions()

    {

        return conf.server_encryption_options;

    }

    public static ClientEncryptionOptions getClientEncryptionOptions()

    {

        return conf.client_encryption_options;

    }

    public static int getHintedHandoffThrottleInKB()

    {

        return conf.hinted_handoff_throttle_in_kb;

    }

    public static int getBatchlogReplayThrottleInKB()

    {

        return conf.batchlog_replay_throttle_in_kb;

    }

    public static void setHintedHandoffThrottleInKB(Integer throttleInKB)