Examples of org.apache.cassandra.locator.IEndpointSnitch

org.apache.cassandra.locator.IEndpointSnitch
This interface helps determine location of node in the data center relative to another node. Give a node A and another node B it can tell if A and B are on the same rack or in the same data center.


    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;
    }

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    }


    private static void setupVersion()
    {
        String req = "INSERT INTO system.%s (key, release_version, cql_version, thrift_version, data_center, rack, partitioner) VALUES ('%s', '%s', '%s', '%s', '%s', '%s', '%s')";
        IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
        processInternal(String.format(req, LOCAL_CF,
                                         LOCAL_KEY,
                                         FBUtilities.getReleaseVersionString(),
                                         QueryProcessor.CQL_VERSION.toString(),
                                         Constants.VERSION,
                                         snitch.getDatacenter(FBUtilities.getBroadcastAddress()),
                                         snitch.getRack(FBUtilities.getBroadcastAddress()),
                                         DatabaseDescriptor.getPartitioner().getClass().getName()));
    }

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    }


    private static void setupVersion()
    {
        String req = "INSERT INTO system.%s (key, release_version, cql_version, thrift_version, native_protocol_version, data_center, rack, partitioner) VALUES ('%s', '%s', '%s', '%s', '%s', '%s', '%s', '%s')";
        IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
        processInternal(String.format(req, LOCAL_CF,
                                         LOCAL_KEY,
                                         FBUtilities.getReleaseVersionString(),
                                         QueryProcessor.CQL_VERSION.toString(),
                                         cassandraConstants.VERSION,
                                         Server.CURRENT_VERSION,
                                         snitch.getDatacenter(FBUtilities.getBroadcastAddress()),
                                         snitch.getRack(FBUtilities.getBroadcastAddress()),
                                         DatabaseDescriptor.getPartitioner().getClass().getName()));
    }

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        return true;
    }


    private static Predicate<InetAddress> sameDCPredicateFor(final String dc)
    {
        final IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
        return new Predicate<InetAddress>()
        {
            public boolean apply(InetAddress host)
            {
                return dc.equals(snitch.getDatacenter(host));
            }
        };
    }

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        if (candidates.isEmpty())
            throw new UnavailableException(ConsistencyLevel.ONE, 1, 0);


        if (candidates.size() > 2)
        {
            IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
            snitch.sortByProximity(FBUtilities.getBroadcastAddress(), candidates);
            candidates = candidates.subList(0, 2);
        }


        return candidates;
    }

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     * may be a bit involved.
     */
    private static InetAddress findSuitableEndpoint(String keyspaceName, ByteBuffer key, String localDataCenter, ConsistencyLevel cl) throws UnavailableException
    {
        Keyspace keyspace = Keyspace.open(keyspaceName);
        IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
        List<InetAddress> endpoints = StorageService.instance.getLiveNaturalEndpoints(keyspace, key);
        if (endpoints.isEmpty())
            // TODO have a way to compute the consistency level
            throw new UnavailableException(cl, cl.blockFor(keyspace), 0);


        List<InetAddress> localEndpoints = new ArrayList<InetAddress>();
        for (InetAddress endpoint : endpoints)
        {
            if (snitch.getDatacenter(endpoint).equals(localDataCenter))
                localEndpoints.add(endpoint);
        }
        if (localEndpoints.isEmpty())
        {
            // No endpoint in local DC, pick the closest endpoint according to the snitch
            snitch.sortByProximity(FBUtilities.getBroadcastAddress(), endpoints);
            return endpoints.get(0);
        }
        else
        {
            return localEndpoints.get(FBUtilities.threadLocalRandom().nextInt(localEndpoints.size()));

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    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;
    }

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        if (candidates.isEmpty())
            throw new UnavailableException(ConsistencyLevel.ONE, 1, 0);


        if (candidates.size() > 2)
        {
            IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
            snitch.sortByProximity(FBUtilities.getBroadcastAddress(), candidates);
            candidates = candidates.subList(0, 2);
        }


        return candidates;
    }

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     * may be a bit involved.
     */
    private static InetAddress findSuitableEndpoint(String tableName, ByteBuffer key, String localDataCenter, ConsistencyLevel cl) throws UnavailableException
    {
        Table table = Table.open(tableName);
        IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
        List<InetAddress> endpoints = StorageService.instance.getLiveNaturalEndpoints(table, key);
        if (endpoints.isEmpty())
            // TODO have a way to compute the consistency level
            throw new UnavailableException(cl, cl.blockFor(table), 0);


        List<InetAddress> localEndpoints = new ArrayList<InetAddress>();
        for (InetAddress endpoint : endpoints)
        {
            if (snitch.getDatacenter(endpoint).equals(localDataCenter))
                localEndpoints.add(endpoint);
        }
        if (localEndpoints.isEmpty())
        {
            // No endpoint in local DC, pick the closest endpoint according to the snitch
            snitch.sortByProximity(FBUtilities.getBroadcastAddress(), endpoints);
            return endpoints.get(0);
        }
        else
        {
            return localEndpoints.get(FBUtilities.threadLocalRandom().nextInt(localEndpoints.size()));

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        // find alive sources for our new ranges
        for (Range range : ranges)
        {
            Collection<InetAddress> possibleRanges = rangeAddresses.get(range);
            IEndpointSnitch snitch = DatabaseDescriptor.getEndpointSnitch();
            List<InetAddress> sources = snitch.getSortedListByProximity(myAddress, possibleRanges);


            assert (!sources.contains(myAddress));


            for (InetAddress source : sources)
            {

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Related Classes of org.apache.cassandra.locator.IEndpointSnitch

org.apache.cassandra.config.DatabaseDescriptor

org.apache.cassandra.config.KSMetaData

org.apache.cassandra.db.SystemKeyspace

org.apache.cassandra.db.SystemTable

org.apache.cassandra.net.OutboundTcpConnectionPool

org.apache.cassandra.service.StorageProxy

org.apache.cassandra.service.StorageService

org.apache.cassandra.service.StorageServiceServerTest

org.apache.cassandra.test.TestChoice

org.apache.cassandra.thrift.ThriftValidation

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