public override void execute(MetaDataServer md)
{
if ((WriteQuorum > NumberOfDataServers) || (ReadQuorum > NumberOfDataServers))
{
throw new CreateFileException("Invalid quorums values in create " + Filename);
}
if (md.FileMetadata.ContainsKey(Filename))
{
throw new CreateFileException("#MDS.create - The file " + Filename + " already exists ");
}
// List<ServerObjectWrapper> newFileDataServers = getFirstServers(md, NumberOfDataServers);
List<ServerObjectWrapper> newFileDataServers = md.getSortedServers(NumberOfDataServers);
FileMetadata newFileMetadata = new FileMetadata(Filename, NumberOfDataServers, ReadQuorum, WriteQuorum, newFileDataServers);
md.FileMetadata.Add(Filename, newFileMetadata);
md.addMetadataLock(Filename, new ManualResetEvent(false));
md.getMigratingFiles().Add(Filename, new List<Tuple<string, string>>());
Console.WriteLine("#MDS: Created " + Filename);
md.makeCheckpoint();
Result = md.FileMetadata[Filename];
}
private Boolean canRemove(MetaDataServer md)
{
FileMetadata metadata = md.FileMetadata[Filename];
int numActualServers = metadata.FileServers.Count;
int numMigratingServers = md.getMigratingFiles()[Filename].Count;
int quorumMax = Math.Max(metadata.WriteQuorum, metadata.ReadQuorum);
int maxMigrating = metadata.FileServers.Count - quorumMax - numMigratingServers;
Console.WriteLine("canMigrate [ numActualServers: " + numActualServers + ", numMigratingServers: " + numMigratingServers + ", quorumMax: " + quorumMax + ", maxMigrating: " + maxMigrating + "] - can? " + (maxMigrating > 0));
return maxMigrating > 0;
}
