private IGossipSeedSource GetGossipSource()
{
IGossipSeedSource gossipSeedSource;
if (_discoverViaDns)
{
gossipSeedSource = new DnsGossipSeedSource(_clusterDns, _clusterGossipPort);
}
else
{
if ((_gossipSeeds == null || _gossipSeeds.Count == 0) && _clusterNodeCount > 1)
{
throw new Exception("DNS discovery is disabled, but no gossip seed endpoints have been specified. "
+ "Specify gossip seeds");
}
if (_gossipSeeds == null)
{
throw new ApplicationException("Gossip seeds cannot be null");
}
gossipSeedSource = new KnownEndpointGossipSeedSource(_gossipSeeds.ToArray());
}
return(gossipSeedSource);
}
protected override void Create(ClusterNodeOptions opts)
{
var dbPath = Path.GetFullPath(ResolveDbPath(opts.DbPath, opts.ExternalHttpPort));
if (!opts.InMemDb)
{
_dbLock = new ExclusiveDbLock(dbPath);
if (!_dbLock.Acquire())
{
throw new Exception(string.Format("Couldn't acquire exclusive lock on DB at '{0}'.", dbPath));
}
}
_clusterNodeMutex = new ClusterNodeMutex();
if (!_clusterNodeMutex.Acquire())
{
throw new Exception(string.Format("Couldn't acquire exclusive Cluster Node mutex '{0}'.", _clusterNodeMutex.MutexName));
}
var dbConfig = CreateDbConfig(dbPath, opts.CachedChunks, opts.ChunksCacheSize, opts.InMemDb);
FileStreamExtensions.ConfigureFlush(disableFlushToDisk: opts.UnsafeDisableFlushToDisk);
var db = new TFChunkDb(dbConfig);
var vNodeSettings = GetClusterVNodeSettings(opts);
IGossipSeedSource gossipSeedSource;
if (opts.DiscoverViaDns)
{
gossipSeedSource = new DnsGossipSeedSource(opts.ClusterDns, opts.ClusterGossipPort);
}
else
{
if (opts.GossipSeeds.Length == 0)
{
if (opts.ClusterSize > 1)
{
Log.Error(string.Format("DNS discovery is disabled, but no gossip seed endpoints have been specified. " +
"Specify gossip seeds using the --{0} command line option.", Opts.GossipSeedCmd));
}
else
{
Log.Info(string.Format("DNS discovery is disabled, but no gossip seed endpoints have been specified. Since" +
"the cluster size is set to 1, this may be intentional. Gossip seeds can be specified" +
"seeds using the --{0} command line option.", Opts.GossipSeedCmd));
}
}
gossipSeedSource = new KnownEndpointGossipSeedSource(opts.GossipSeeds);
}
var dbVerifyHashes = !opts.SkipDbVerify;
var runProjections = opts.RunProjections;
Log.Info("\n{0,-25} {1}\n"
+ "{2,-25} {3}\n"
+ "{4,-25} {5} (0x{5:X})\n"
+ "{6,-25} {7} (0x{7:X})\n"
+ "{8,-25} {9} (0x{9:X})\n"
+ "{10,-25} {11} (0x{11:X})\n",
"INSTANCE ID:", vNodeSettings.NodeInfo.InstanceId,
"DATABASE:", db.Config.Path,
"WRITER CHECKPOINT:", db.Config.WriterCheckpoint.Read(),
"CHASER CHECKPOINT:", db.Config.ChaserCheckpoint.Read(),
"EPOCH CHECKPOINT:", db.Config.EpochCheckpoint.Read(),
"TRUNCATE CHECKPOINT:", db.Config.TruncateCheckpoint.Read());
var enabledNodeSubsystems = runProjections >= RunProjections.System
? new[] { NodeSubsystems.Projections }
: new NodeSubsystems[0];
_projections = new Projections.Core.ProjectionsSubsystem(opts.ProjectionThreads, opts.RunProjections);
_node = new ClusterVNode(db, vNodeSettings, gossipSeedSource, dbVerifyHashes, opts.MaxMemTableSize, _projections);
RegisterWebControllers(enabledNodeSubsystems, vNodeSettings);
RegisterUiProjections();
}