public DataAddress Commit(string pathName, DataAddress proposal)
{
CheckConnected();
IServiceAddress rootAddress = storageSystem.GetRootServer(pathName);
return storageSystem.Commit(rootAddress, pathName, proposal);
}
public void PublishPath(IServiceAddress root, string pathName, DataAddress address)
{
InspectNetwork();
// Check machine is in the schema,
MachineProfile machine = CheckMachineInNetwork(root);
// Check it's root,
if (!machine.IsRoot)
{
throw new NetworkAdminException("Machine '" + root + "' is not a root");
}
// Perform the command,
RequestMessage request = new RequestMessage("publishPath");
request.Arguments.Add(pathName);
request.Arguments.Add(address);
Message m = Command(root, ServiceType.Root, request);
if (m.HasError)
{
throw new NetworkAdminException(m.ErrorMessage);
}
}
public DataAddress Max(DataAddress address)
{
if (Value.CompareTo(address.Value) >= 0)
{
return(this);
}
return(address);
}
public override bool Equals(object obj)
{
DataAddress other = obj as DataAddress;
if (other == null)
{
return(false);
}
return(Value.Equals(other.Value));
}
private void AddPath(string pathName, string pathTypeName, DataAddress rootNode)
{
// Check the name given is valid,
CheckPathNameValid(pathName);
lock (pathCache) {
if (pathCache.ContainsKey(pathName))
// If it's input the local map, generate an error,
throw new ApplicationException("Path '" + pathName + "' already exists.");
CreatePath(pathName, pathTypeName);
}
if (rootNode != null) {
// Finally publish the base_root to the path,
PublishPath(pathName, rootNode);
}
}
public void SetPathRoot(IServiceAddress root, String pathName, DataAddress address)
{
InspectNetwork();
// Check machine is in the schema,
MachineProfile machineP = CheckMachineInNetwork(root);
// Check it's root,
if (!machineP.IsRoot)
{
throw new NetworkAdminException("Machine '" + root + "' is not a root");
}
// Perform the command,
Message message = new Message("publishPath", pathName, address);
Message m = Command(root, ServiceType.Root, message.AsStream());
if (m.HasError)
{
throw new NetworkAdminException(m.ErrorMessage);
}
}
public object[] FetchPathDataBundle(long fromUid, DataAddress fromAddr, int bundleSize)
{
List<PathRecordEntry> entriesList = new List<PathRecordEntry>(bundleSize);
// Synchronize over the object
lock (accessLock) {
// Check near the end (most likely to be found there),
long setSize = internalFile.Length/RootItemSize;
long searchS;
long found = -1;
long pos;
if (fromUid > 0) {
// If from_uid is real,
pos = BinarySearch(pagedFile, 0, setSize - 1, fromUid);
pos = Math.Max(0, pos - 256);
searchS = pos;
// Search to the end,
while (true) {
// End condition,
if (pos >= setSize) {
break;
}
PathRecordEntry entry = GetEntryAt(pos*RootItemSize);
if (entry.Uid == fromUid && entry.Address.Equals(fromAddr)) {
// Found!
found = pos;
break;
}
++pos;
}
} else {
// If from_uid is less than 0, it indicates to fetch the bundle of
// path entries from the start.
pos = -1;
found = 0;
searchS = 0;
}
// If not found,
if (found < 0) {
// Try from search_s to 0
pos = searchS - 1;
while (true) {
// End condition,
if (pos < 0) {
break;
}
PathRecordEntry entry = GetEntryAt(pos*RootItemSize);
if (entry.Uid == fromUid && entry.Address.Equals(fromAddr)) {
// Found!
found = pos;
break;
}
--pos;
}
}
// Go to the next entry,
++pos;
// Still not found, or at the end
if (found < 0 || pos >= setSize) {
return new Object[] {new long[0], new DataAddress[0]};
}
// Fetch a bundle of records from the position
while (true) {
// End condition,
if (pos >= setSize || entriesList.Count >= bundleSize) {
break;
}
PathRecordEntry entry = GetEntryAt(pos*RootItemSize);
entriesList.Add(entry);
++pos;
}
}
// Format it as long[] and DataAddress[] arrays
int sz = entriesList.Count;
long[] uids = new long[sz];
DataAddress[] addrs = new DataAddress[sz];
for (int i = 0; i < sz; ++i) {
uids[i] = entriesList[i].Uid;
addrs[i] = entriesList[i].Address;
}
return new Object[] {uids, addrs};
}
public PathRecordEntry(long uid, DataAddress address)
{
Uid = uid;
Address = address;
}
private DataAddress PerformCommit(PathInfo pathInfo, DataAddress proposal)
{
IServiceAddress[] manSrvs = managerServers;
// Fetch the path access object for the given name.
PathAccess pathFile = GetPathAccess(pathInfo.PathName);
IPath pathFunction;
try {
pathFunction = pathFile.Path;
} catch (TypeLoadException e) {
throw new CommitFaultException(String.Format("Type not found: {0}", e.Message));
} catch (TypeInitializationException e) {
throw new CommitFaultException(String.Format("Type instantiation exception: {0}", e.Message));
} catch (AccessViolationException e) {
throw new CommitFaultException(String.Format("Illegal Access exception: {0}", e.Message));
}
// Create the connection object (should be fairly lightweight)
INetworkCache localNetCache = MachineState.GetCacheForManager(manSrvs);
IPathConnection connection = new PathConnection(this, pathInfo, connector, manSrvs, localNetCache, serviceTracker);
// Perform the commit,
return pathFunction.Commit(connection, proposal);
}
private void NotifyAllRootServersOfPost(PathInfo pathInfo, long uid, DataAddress rootNode)
{
// The root servers for the path,
IServiceAddress[] roots = pathInfo.RootServers;
// Create the message,
MessageStream outputStream = new MessageStream();
outputStream.AddMessage(new Message("notifyNewProposal", pathInfo.PathName, uid, rootNode));
for (int i = 0; i < roots.Length; ++i) {
IServiceAddress machine = roots[i];
// Don't notify this service,
if (!machine.Equals(address)) {
// If the service is up in the tracker,
if (serviceTracker.IsServiceUp(machine, ServiceType.Root)) {
// Send the message to the service,
IMessageProcessor processor = connector.Connect(machine, ServiceType.Root);
IEnumerable<Message> inputStream = processor.Process(outputStream);
// If return is a connection fault,
foreach (Message m in inputStream) {
if (m.HasError &&
ReplicatedValueStore.IsConnectionFault(m)) {
serviceTracker.ReportServiceDownClientReport(machine, ServiceType.Root);
}
}
}
}
}
}
public DataAddress Commit(string pathName, DataAddress proposal)
{
return(treeSystem.PerformCommit(pathName, proposal));
}
public DataAddress Commit(IServiceAddress root_server, String path_name, DataAddress proposal)
{
IMessageProcessor processor = connector.Connect(root_server, ServiceType.Root);
RequestMessage request = new RequestMessage("commit");
request.Arguments.Add(path_name);
request.Arguments.Add(proposal);
Message response = processor.Process(request);
if (response.HasError) {
MessageError et = response.Error;
// If it's a commit fault exception, wrap it locally.
if (et.Source.Equals("Deveel.Data.Net.CommitFaultException"))
throw new CommitFaultException(et.Message);
throw new Exception(et.Message);
}
// Return the DataAddress of the result transaction,
return (DataAddress) response.Arguments[0].Value;
}
public ITransaction CreateTransaction(DataAddress rootNode)
{
return new Transaction(this, 0, rootNode);
}
public void SetNode(DataAddress address, ITreeNode node)
{
lock (heapCache) {
heapCache.Set(address, node);
}
}
public NodeSet GetNodeSet(int dataId)
{
if (dataId < 0 || dataId >= 16384)
{
throw new ArgumentException("dataId out of range");
}
try {
int dataPointer = dataId;
int pos = dataPointer * 6;
int dataIdPos = pagedAccess.ReadInt32(pos);
int dataIdLength = ((int)pagedAccess.ReadInt16(pos + 4)) & 0x0FFFF;
if (dataIdPos < 0)
{
dataPointer = -(dataIdPos + 1);
pos = dataPointer * 6;
dataIdPos = pagedAccess.ReadInt32(pos);
dataIdLength = ((int)pagedAccess.ReadInt16(pos + 4)) & 0x0FFFF;
}
// Fetch the node set,
List <int> nodeIds = new List <int>(24);
nodeIds.Add(dataPointer);
while (true)
{
++dataPointer;
pos += 6;
int check_v = pagedAccess.ReadInt32(pos);
if (check_v < 0)
{
nodeIds.Add(dataPointer);
}
else
{
break;
}
}
// Turn it into a node array,
int sz = nodeIds.Count;
NodeId[] lnodeIds = new NodeId[sz];
for (int i = 0; i < sz; ++i)
{
DataAddress daddr = new DataAddress(blockId, nodeIds[i]);
lnodeIds[i] = daddr.Value;
}
// Read the encoded form into a byte[] array,
byte[] buf = new byte[dataIdLength];
content.Seek(dataIdPos, SeekOrigin.Begin);
content.Read(buf, 0, dataIdLength);
// Return it,
return(new CompressedNodeSet(lnodeIds, buf));
} catch (IOException e) {
// We wrap this IOException around a BlockReadException. This can only
// indicate a corrupt compressed block file or access to a dataId that
// is out of range of the nodes stored in this file.
throw new BlockReadException("IOError reading data from block file", e);
}
}
public ITransaction CreateTransaction(DataAddress rootNode)
{
// Create the transaction object and return it,
return treeSystem.CreateTransaction(rootNode);
}
public InvalidDataState(string message, DataAddress address)
: base(message)
{
this.address = address;
}
public ITreeNode GetNode(DataAddress address)
{
lock (heapCache) {
return(heapCache.Get(address) as ITreeNode);
}
}
public bool IsNodeAvailable(long node_ref)
{
// Special node ref,
if ((node_ref & 0x01000000000000000L) != 0) {
return true;
}
// Check if it's in the local network cache
DataAddress address = new DataAddress(node_ref);
return (networkCache.GetNode(address) != null);
}
public void RemoveNode(DataAddress address)
{
lock (heapCache) {
heapCache.Remove(address);
}
}
private void CheckAndFixAllocationServers()
{
// If the failure report is on a block service that is servicing allocation
// requests, we push the allocation requests to the next block.
long currentBlockId;
lock (allocationLock) {
currentBlockId = currentAddressSpaceEnd.BlockId;
}
long[] bservers = GetOnlineServersWithBlock(currentBlockId);
int okServerCount = 0;
// Change the status of the block service to STATUS_DOWN_CLIENT_REPORT
lock (blockServersMap) {
// For each service that stores the block,
for (int i = 0; i < bservers.Length; ++i) {
long serverGuid = bservers[i];
// Is the status of this service UP?
foreach (BlockServerInfo block_server in blockServers) {
// If this matches the guid, and is up, we add to 'ok_server_count'
if (block_server.Guid == serverGuid &&
block_server.Status == ServiceStatus.Up) {
++okServerCount;
}
}
}
}
// If the count of ok servers for the allocation set size is not
// the same then there are one or more servers that are inoperable
// in the allocation set. So, we increment the block id ref of
// 'current address space end' by 1 to force a reevaluation of the
// servers to allocate the current block.
if (okServerCount != bservers.Length) {
lock (allocationLock) {
long blockId = currentAddressSpaceEnd.BlockId;
int dataId = currentAddressSpaceEnd.DataId;
if (currentBlockId == blockId) {
++blockId;
dataId = 0;
currentAddressSpaceEnd = new DataAddress(blockId, dataId);
}
}
}
}
public IEnumerable <Message> Process(IEnumerable <Message> stream)
{
// The map of containers touched,
Dictionary <BlockId, BlockContainer> containersTouched = new Dictionary <BlockId, BlockContainer>();
// The reply message,
MessageStream replyMessage = new MessageStream();
// The nodes fetched in this message,
List <NodeId> readNodes = null;
foreach (Message m in stream)
{
try {
// Check for stop state,
service.CheckErrorState();
// writeToBlock(DataAddress, byte[], int, int)
if (m.Name.Equals("writeToBlock"))
{
WriteToBlock(containersTouched,
(DataAddress)m.Arguments[0].Value,
(byte[])m.Arguments[1].Value, (int)m.Arguments[2].Value,
(int)m.Arguments[3].Value);
replyMessage.AddMessage(new Message(1L));
}
// readFromBlock(DataAddress)
else if (m.Name.Equals("readFromBlock"))
{
if (readNodes == null)
{
readNodes = new List <NodeId>();
}
DataAddress addr = (DataAddress)m.Arguments[0].Value;
if (!readNodes.Contains(addr.Value))
{
NodeSet nodeSet = ReadFromBlock(containersTouched, addr);
replyMessage.AddMessage(new Message(nodeSet));
readNodes.AddRange(nodeSet.NodeIds);
}
}
// rollbackNodes(DataAddress[] )
else if (m.Name.Equals("rollbackNodes"))
{
RemoveNodes(containersTouched, (DataAddress[])m.Arguments[0].Value);
replyMessage.AddMessage(new Message(1L));
}
// deleteBlock(BlockId)
else if (m.Name.Equals("deleteBlock"))
{
DeleteBlock((BlockId)m.Arguments[0].Value);
replyMessage.AddMessage(new Message(1L));
}
// serverGUID()
else if (m.Name.Equals("serverGUID"))
{
replyMessage.AddMessage(new Message(service.Id));
}
// blockSetReport()
else if (m.Name.Equals("blockSetReport"))
{
BlockId[] arr = BlockSetReport();
replyMessage.AddMessage(new Message(service.Id, arr));
}
// poll(String)
else if (m.Name.Equals("poll"))
{
replyMessage.AddMessage(new Message(1L));
}
// notifyCurrentBlockId(BlockId)
else if (m.Name.Equals("notifyCurrentBlockId"))
{
service.NotifyCurrentBlockId((BlockId)m.Arguments[0].Value);
replyMessage.AddMessage(new Message(1L));
}
// blockChecksum(BlockId)
else if (m.Name.Equals("blockChecksum"))
{
long checksum = BlockChecksum(containersTouched, (BlockId)m.Arguments[0].Value);
replyMessage.AddMessage(new Message(checksum));
}
// sendBlockTo(BlockId, IServiceAddress, long, IServerAddress[])
else if (m.Name.Equals("sendBlockTo"))
{
// Returns immediately. There's currently no way to determine
// when this process will happen or if it will happen.
BlockId blockId = (BlockId)m.Arguments[0].Value;
IServiceAddress destAddress = (IServiceAddress)m.Arguments[1].Value;
long destServerId = (long)m.Arguments[2].Value;
IServiceAddress[] managerServers = (IServiceAddress[])m.Arguments[3].Value;
long processId = SendBlockTo(blockId, destAddress, destServerId, managerServers);
replyMessage.AddMessage(new Message(processId));
}
// sendBlockPart(BlockId, long, int, byte[], int)
else if (m.Name.Equals("sendBlockPart"))
{
BlockId blockId = (BlockId)m.Arguments[0].Value;
long pos = (long)m.Arguments[1].Value;
int fileType = (int)m.Arguments[2].Value;
byte[] buf = (byte[])m.Arguments[3].Value;
int bufSize = (int)m.Arguments[4].Value;
service.WriteBlockPart(blockId, pos, fileType, buf, bufSize);
replyMessage.AddMessage(new Message(1L));
}
// sendBlockComplete(BlockId, int)
else if (m.Name.Equals("sendBlockComplete"))
{
BlockId blockId = (BlockId)m.Arguments[0].Value;
int fileType = (int)m.Arguments[1].Value;
service.WriteBlockComplete(blockId, fileType);
replyMessage.AddMessage(new Message(1L));
}
// createAvailabilityMapForBlocks(BlockId[])
else if (m.Name.Equals("createAvailabilityMapForBlocks"))
{
BlockId[] blockIds = (BlockId[])m.Arguments[0].Value;
byte[] map = service.CreateAvailabilityMapForBlocks(blockIds);
replyMessage.AddMessage(new Message(map));
}
// bindWithManager()
else if (m.Name.Equals("bindWithManager"))
{
BindWithManager();
replyMessage.AddMessage(new Message(1L));
}
// unbindWithManager()
else if (m.Name.Equals("unbindWithManager"))
{
UnbindWithManager();
replyMessage.AddMessage(new Message(1L));
}
else
{
throw new ApplicationException("Unknown command: " + m.Name);
}
} catch (OutOfMemoryException e) {
service.Logger.Error("Memory Error", e);
service.SetErrorState(e);
throw;
} catch (Exception e) {
service.Logger.Error("Exception during process", e);
replyMessage.AddMessage(new Message(new MessageError(e)));
}
}
// Release any containers touched,
try {
CloseContainers(containersTouched);
} catch (IOException e) {
service.Logger.Error("IOError when closing containers", e);
}
return(replyMessage);
}
private object[] InternalFetchPathDataBundle(string pathName, long uid, DataAddress addr)
{
// Fetch the path access object for the given name.
PathAccess pathFile = GetPathAccess(pathName);
// Init the local data if we need to,
pathFile.OpenLocalData();
// Fetch 256 entries,
return pathFile.FetchPathDataBundle(uid, addr, 256);
}
private NodeSet ReadFromBlock(Dictionary <BlockId, BlockContainer> containersTouched, DataAddress address)
{
// The block being written to,
BlockId blockId = address.BlockId;
// The data identifier,
int dataId = address.DataId;
// Fetch the block container,
BlockContainer container = GetBlock(containersTouched, blockId);
// Read the data,
return(container.Read(dataId));
}
private void NotifyNewProposal(String pathName, long uid, DataAddress node)
{
// Fetch the path access object for the given name.
PathAccess pathFile = GetPathAccess(pathName);
// Go tell the PathAccess
pathFile.NotifyNewProposal(uid, node);
}
private void WriteToBlock(Dictionary <BlockId, BlockContainer> containersTouched, DataAddress address, byte[] buffer,
int offset, int length)
{
// The block being written to,
BlockId blockId = address.BlockId;
// The data identifier,
int dataId = address.DataId;
// Fetch the block container,
BlockContainer container = GetBlock(containersTouched, blockId);
// Write the data,
container.Write(dataId, buffer, offset, length);
// Schedule the block to be file synch'd 5 seconds after a write
service.ScheduleFileFlush(container, 5000);
}
private void PostToPath(PathInfo pathInfo, DataAddress rootNode)
{
// We can't post if this service is not the root leader,
if (!pathInfo.RootLeader.Equals(address)) {
Logger.Error(String.Format("Failed, {0} is not root leader for {1}", address, pathInfo.PathName));
throw new ApplicationException("Can't post update, this root service (" + address +
") is not the root leader for the path: " + pathInfo.PathName);
}
// Fetch the path access object for the given name.
PathAccess pathFile = GetPathAccess(pathInfo.PathName);
// Only allow post if complete and synchronized
pathFile.CheckIsSynchronized();
// Create a unique time based uid.
long uid = CreateUID();
// Post the data address to the path,
pathFile.PostProposalToPath(uid, rootNode);
// Notify all the root servers of this post,
NotifyAllRootServersOfPost(pathInfo, uid, rootNode);
}
public void AddPath(IServiceAddress root, string pathName, string pathType)
{
InspectNetwork();
// Check machine is in the schema,
MachineProfile machineProfile = CheckMachineInNetwork(root);
if (!machineProfile.IsRoot)
{
throw new NetworkAdminException("Machine '" + root + "' is not a root");
}
// Get the current manager server,
MachineProfile man = ManagerServer;
if (man == null)
{
throw new NetworkAdminException("No manager server found");
}
// Check with the root server that the class instantiates,
Message outputStream = new RequestMessage("checkPathType");
outputStream.Arguments.Add(pathType);
Message m = Command(root, ServiceType.Root, outputStream);
if (m.HasError)
{
throw new NetworkAdminException("Type '" + pathType + "' doesn't instantiate on the root");
}
IServiceAddress managerServer = man.Address;
// Create a new empty database,
NetworkClient client = new NetworkClient(managerServer, connector);
client.Connect();
DataAddress dataAddress = client.CreateEmptyDatabase();
client.Disconnect();
// Perform the command,
outputStream = new MessageStream(MessageType.Request);
RequestMessage request = new RequestMessage("addPath");
request.Arguments.Add(pathName);
request.Arguments.Add(pathType);
request.Arguments.Add(dataAddress);
((MessageStream)outputStream).AddMessage(request);
request = new RequestMessage("initPath");
request.Arguments.Add(pathName);
((MessageStream)outputStream).AddMessage(request);
Message message = Command(root, ServiceType.Root, outputStream);
if (message.HasError)
{
throw new NetworkAdminException(message.ErrorMessage);
}
// Tell the manager server about this path,
outputStream = new RequestMessage("addPathRootMapping");
outputStream.Arguments.Add(pathName);
outputStream.Arguments.Add(root);
message = Command(managerServer, ServiceType.Manager, outputStream);
if (message.HasError)
{
throw new NetworkAdminException(message.ErrorMessage);
}
}
public void AddPathDataEntries(long[] uids, DataAddress[] addrs)
{
lock (accessLock) {
int sz = uids.Length;
for (int i = 0; i < sz; ++i) {
long uid = uids[i];
DataAddress addr = addrs[i];
// Post the proposal if it's not present
PostProposalIfNotPresent(uid, addr);
}
}
}
public ITransaction CreateTransaction(DataAddress rootNode)
{
return treeSystem.CreateTransaction(rootNode);
}
internal DbRootAddress(DbSession session, DataAddress address)
{
this.session = session;
this.address = address;
}
public DataAddress[] GetSnapshots(DataAddress rootNode)
{
try {
return service.GetPathRootsSince(pathInfo, rootNode);
} catch (IOException e) {
throw HandleIOError(e);
}
}
public DataAddress Commit(string pathName, DataAddress proposal)
{
return treeSystem.PerformCommit(pathName, proposal);
}
public void Publish(DataAddress rootNode)
{
try {
service.PostToPath(pathInfo, rootNode);
} catch (IOException e) {
throw HandleIOError(e);
}
}
internal Transaction(ITreeSystem storeSystem, long versionId, DataAddress rootNode)
: base(storeSystem, versionId, rootNode.Value, false)
{
}
private DataAddress Commit(string pathName, int pathInfoVersion, DataAddress proposal)
{
// Find the PathInfo object from the path_info_version. If the path
// version is out of date then an exception is generated.
PathInfo pathInfo = service.GetPathInfo(pathName, pathInfoVersion);
return service.PerformCommit(pathInfo, proposal);
}
public IList<ITreeNode> FetchNodes(long[] nids)
{
// The number of nodes,
int node_count = nids.Length;
// The array of read nodes,
ITreeNode[] result_nodes = new ITreeNode[node_count];
// Resolve special nodes first,
{
int i = 0;
foreach (long nodeId in nids) {
if ((nodeId & 0x01000000000000000L) != 0)
result_nodes[i] = SparseLeafNode.Create(nodeId);
++i;
}
}
// Group all the nodes to the same block,
List<long> uniqueBlocks = new List<long>();
List<List<long>> uniqueBlockList = new List<List<long>>();
{
int i = 0;
foreach (long node_ref in nids) {
// If it's not a special node,
if ((node_ref & 0x01000000000000000L) == 0) {
// Get the block id and add it to the list of unique blocks,
DataAddress address = new DataAddress(node_ref);
// Check if the node is in the local cache,
ITreeNode node = networkCache.GetNode(address);
if (node != null) {
result_nodes[i] = node;
} else {
// Not in the local cache so we need to bundle this up in a node
// request on the block servers,
// Group this node request by the block identifier
long blockId = address.BlockId;
int ind = uniqueBlocks.IndexOf(blockId);
if (ind == -1) {
ind = uniqueBlocks.Count;
uniqueBlocks.Add(blockId);
uniqueBlockList.Add(new List<long>());
}
List<long> blist = uniqueBlockList[ind];
blist.Add(node_ref);
}
}
++i;
}
}
// Exit early if no blocks,
if (uniqueBlocks.Count == 0)
return result_nodes;
// Resolve server records for the given block identifiers,
IDictionary<long, IList<BlockServerElement>> servers_map = GetServersForBlock(uniqueBlocks);
// The result nodes list,
List<ITreeNode> nodes = new List<ITreeNode>();
// For each unique block list,
foreach (List<long> blist in uniqueBlockList) {
// Make a block server request for each node in the block,
MessageStream block_server_msg = new MessageStream(MessageType.Request);
long block_id = -1;
foreach (long node_ref in blist) {
DataAddress address = new DataAddress(node_ref);
RequestMessage request = new RequestMessage("readFromBlock");
request.Arguments.Add(address);
block_server_msg.AddMessage(request);
block_id = address.BlockId;
}
if (block_id == -1)
throw new ApplicationException("block_id == -1");
// Get the shuffled list of servers the block is stored on,
IList<BlockServerElement> servers = servers_map[block_id];
// Go through the servers one at a time to fetch the block,
bool success = false;
for (int z = 0; z < servers.Count && !success; ++z) {
BlockServerElement server = servers[z];
// If the server is up,
if (server.IsStatusUp) {
// Open a connection with the block server,
IMessageProcessor block_server_proc = connector.Connect(server.Address, ServiceType.Block);
MessageStream message_in = (MessageStream) block_server_proc.Process(block_server_msg);
// DEBUG: ++networkCommCount;
// DEBUG: ++networkFetchCommCount;
bool is_error = false;
bool severe_error = false;
// Turn each none-error message into a node
foreach (ResponseMessage m in message_in) {
if (m.HasError) {
// See if this error is a block read error. If it is, we don't
// tell the manager server to lock this server out completely.
bool is_block_read_error = m.Error.Source.Equals("Deveel.Data.Net.BlockReadException");
if (!is_block_read_error) {
// If it's something other than a block read error, we mark
// this error as severe,
severe_error = true;
}
is_error = true;
} else if (!is_error) {
// The reply contains the block of data read.
NodeSet node_set = (NodeSet)m.Arguments[0].Value;
// Decode the node items into node objects,
IEnumerator<Node> item_iterator = node_set.GetEnumerator();
while (item_iterator.MoveNext()) {
// Get the node item,
Node node_item = item_iterator.Current;
long node_ref = node_item.Id;
DataAddress address = new DataAddress(node_ref);
// Wrap around a buffered DataInputStream for reading values
// from the store.
BinaryReader input = new BinaryReader(node_item.Input, Encoding.Unicode);
short node_type = input.ReadInt16();
ITreeNode read_node;
// Is the node type a leaf node?
if (node_type == LeafType) {
// Read the key
int leaf_size = input.ReadInt32();
byte[] buf = ReadNodeAsBuffer(node_item);
if (buf == null) {
buf = new byte[leaf_size + 6];
input.Read(buf, 6, leaf_size);
// Technically, we could comment these next two lines out.
ByteBuffer.WriteInt2(node_type, buf, 0);
ByteBuffer.WriteInt4(leaf_size, buf, 2);
}
// Create a leaf that's mapped to this data
read_node = new ByteArrayTreeLeaf(node_ref, buf); ;
}
// Is the node type a branch node?
else if (node_type == BranchType) {
// Note that the entire branch is loaded into memory,
int child_data_size = input.ReadInt32();
long[] data_arr = new long[child_data_size];
for (int n = 0; n < child_data_size; ++n) {
data_arr[n] = input.ReadInt64();
}
// Create the branch node,
read_node = new TreeBranch(node_ref, data_arr, child_data_size);
} else {
throw new InvalidDataState("Unknown node type: " + node_type, address);
}
// Is the node already in the list? If so we don't add it.
if (!IsInNodeList(node_ref, nodes)) {
// Put the read node in the cache and add it to the 'nodes'
// list.
networkCache.SetNode(address, read_node);
nodes.Add(read_node);
}
}
}
}
// If there was no error while reading the result, we assume the node
// requests were successfully read.
if (is_error == false) {
success = true;
} else {
if (severe_error) {
// If this is an error, we need to report the failure to the
// manager server,
ReportBlockServerFailure(server.Address);
// Remove the block id from the server list cache,
networkCache.RemoveServers(block_id);
} else {
// Otherwise, not a severe error (probably a corrupt block on a
// server), so shuffle the server list for this block_id so next
// time there's less chance of hitting this bad block.
IList<BlockServerElement> srvs = networkCache.GetServers(block_id);
List<BlockServerElement> server_list = new List<BlockServerElement>();
server_list.AddRange(srvs);
CollectionsUtil.Shuffle(server_list);
networkCache.SetServers(block_id, server_list, 15 * 60 * 1000);
}
}
}
}
// If the nodes were not successfully read, we generate an exception,
if (!success) {
// Remove from the cache,
networkCache.RemoveServers(block_id);
throw new ApplicationException("Unable to fetch node from block server");
}
}
int sz = nodes.Count;
if (sz == 0)
throw new ApplicationException("Empty nodes list");
for (int i = 0; i < sz; ++i) {
ITreeNode node = nodes[i];
long node_ref = node.Id;
for (int n = 0; n < nids.Length; ++n) {
if (nids[n] == node_ref)
result_nodes[n] = node;
}
}
// Check the result_nodes list is completely populated,
for (int n = 0; n < result_nodes.Length; ++n) {
if (result_nodes[n] == null)
throw new ApplicationException("Assertion failed: result_nodes not completely populated.");
}
return result_nodes;
}
private string GetSnapshotStats(string pathName, int pathInfoVersion, DataAddress address)
{
// Find the PathInfo object from the path_info_version. If the path
// version is out of date then an exception is generated.
PathInfo pathInfo = service.GetPathInfo(pathName, pathInfoVersion);
return service.iGetSnapshotStats(pathInfo, address);
}
private List<long> DoPersist(TreeWrite sequence, int tryCount)
{
// NOTE: nodes are written in order of branches and then leaf nodes. All
// branch nodes and leafs are grouped together.
// The list of nodes to be allocated,
IList<ITreeNode> allBranches = sequence.BranchNodes;
IList<ITreeNode> allLeafs = sequence.LeafNodes;
List<ITreeNode> nodes = new List<ITreeNode>(allBranches.Count + allLeafs.Count);
nodes.AddRange(allBranches);
nodes.AddRange(allLeafs);
int sz = nodes.Count;
// The list of allocated referenced for the nodes,
DataAddress[] refs = new DataAddress[sz];
long[] outRefs = new long[sz];
MessageStream allocateMessage = new MessageStream(MessageType.Request);
// Make a connection with the manager server,
IMessageProcessor manager = connector.Connect(managerAddress, ServiceType.Manager);
// Allocate the space first,
for (int i = 0; i < sz; ++i) {
ITreeNode node = nodes[i];
RequestMessage request = new RequestMessage("allocateNode");
// Is it a branch node?
if (node is TreeBranch) {
// Branch nodes are 1K in size,
request.Arguments.Add(1024);
} else {
// Leaf nodes are 4k in size,
request.Arguments.Add(4096);
}
allocateMessage.AddMessage(request);
}
// The result of the set of allocations,
MessageStream resultStream = (MessageStream) manager.Process(allocateMessage);
//DEBUG: ++network_comm_count;
// The unique list of blocks,
List<long> uniqueBlocks = new List<long>();
// Parse the result stream one message at a time, the order will be the
// order of the allocation messages,
int n = 0;
foreach (ResponseMessage m in resultStream) {
if (m.HasError)
throw m.Error.AsException();
DataAddress addr = (DataAddress) m.Arguments[0].Value;
refs[n] = addr;
// Make a list of unique block identifiers,
if (!uniqueBlocks.Contains(addr.BlockId)) {
uniqueBlocks.Add(addr.BlockId);
}
++n;
}
// Get the block to server map for each of the blocks,
IDictionary<long, IList<BlockServerElement>> blockToServerMap = GetServersForBlock(uniqueBlocks);
// Make message streams for each unique block
int ubid_count = uniqueBlocks.Count;
MessageStream[] ubidStream = new MessageStream[ubid_count];
for (int i = 0; i < ubidStream.Length; ++i) {
ubidStream[i] = new MessageStream(MessageType.Request);
}
// Scan all the blocks and create the message streams,
for (int i = 0; i < sz; ++i) {
byte[] nodeBuf;
ITreeNode node = nodes[i];
// Is it a branch node?
if (node is TreeBranch) {
TreeBranch branch = (TreeBranch)node;
// Make a copy of the branch (NOTE; we Clone() the array here).
long[] curNodeData = (long[])branch.ChildPointers.Clone();
int curNdsz = branch.DataSize;
branch = new TreeBranch(refs[i].Value, curNodeData, curNdsz);
// The number of children
int chsz = branch.ChildCount;
// For each child, if it's a heap node, look up the child id and
// reference map in the sequence and set the reference accordingly,
for (int o = 0; o < chsz; ++o) {
long childRef = branch.GetChild(o);
if (childRef < 0) {
// The ref is currently on the heap, so adjust accordingly
int ref_id = sequence.LookupRef(i, o);
branch.SetChildOverride(o, refs[ref_id].Value);
}
}
// Turn the branch into a 'node_buf' byte[] array object for
// serialization.
long[] nodeData = branch.ChildPointers;
int ndsz = branch.DataSize;
MemoryStream bout = new MemoryStream(1024);
BinaryWriter dout = new BinaryWriter(bout, Encoding.Unicode);
dout.Write(BranchType);
dout.Write(ndsz);
for (int o = 0; o < ndsz; ++o) {
dout.Write(nodeData[o]);
}
dout.Flush();
// Turn it into a byte array,
nodeBuf = bout.ToArray();
// Put this branch into the local cache,
networkCache.SetNode(refs[i], branch);
} else {
// If it's a leaf node,
TreeLeaf leaf = (TreeLeaf)node;
int lfsz = leaf.Length;
nodeBuf = new byte[lfsz + 6];
// Technically, we could comment these next two lines out.
ByteBuffer.WriteInt2(LeafType, nodeBuf, 0);
ByteBuffer.WriteInt4(lfsz, nodeBuf, 2);
leaf.Read(0, nodeBuf, 6, lfsz);
// Put this leaf into the local cache,
leaf = new ByteArrayTreeLeaf(refs[i].Value, nodeBuf);
networkCache.SetNode(refs[i], leaf);
}
// The DataAddress this node is being written to,
DataAddress address = refs[i];
// Get the block id,
long blockId = address.BlockId;
int bid = uniqueBlocks.IndexOf(blockId);
RequestMessage request = new RequestMessage("writeToBlock");
request.Arguments.Add(address);
request.Arguments.Add(nodeBuf);
request.Arguments.Add(0);
request.Arguments.Add(nodeBuf.Length);
ubidStream[bid].AddMessage(request);
// Update 'outRefs' array,
outRefs[i] = refs[i].Value;
}
// A log of successfully processed operations,
List<object> successProcess = new List<object>(64);
// Now process the streams on the servers,
for (int i = 0; i < ubidStream.Length; ++i) {
// The output message,
MessageStream requestMessageStream = ubidStream[i];
// Get the servers this message needs to be sent to,
long block_id = uniqueBlocks[i];
IList<BlockServerElement> blockServers = blockToServerMap[block_id];
// Format a message for writing this node out,
int bssz = blockServers.Count;
IMessageProcessor[] blockServerProcs = new IMessageProcessor[bssz];
// Make the block server connections,
for (int o = 0; o < bssz; ++o) {
IServiceAddress address = blockServers[o].Address;
blockServerProcs[o] = connector.Connect(address, ServiceType.Block);
MessageStream responseMessageStream = (MessageStream) blockServerProcs[o].Process(requestMessageStream);
//DEBUG: ++network_comm_count;
if (responseMessageStream.HasError) {
// If this is an error, we need to report the failure to the
// manager server,
ReportBlockServerFailure(address);
// Remove the block id from the server list cache,
networkCache.RemoveServers(block_id);
// Rollback any server writes already successfully made,
for (int p = 0; p < successProcess.Count; p += 2) {
IServiceAddress blockAddress = (IServiceAddress) successProcess[p];
MessageStream toRollback = (MessageStream) successProcess[p + 1];
List<DataAddress> rollbackNodes = new List<DataAddress>(128);
foreach(Message rm in toRollback) {
DataAddress raddr = (DataAddress) rm.Arguments[0].Value;
rollbackNodes.Add(raddr);
}
// Create the rollback message,
RequestMessage rollbackRequest = new RequestMessage("rollbackNodes");
rollbackRequest.Arguments.Add(rollbackNodes.ToArray());
// Send it to the block server,
Message responseMessage = connector.Connect(blockAddress, ServiceType.Block).Process(rollbackRequest);
//DEBUG: ++network_comm_count;
// If rollback generated an error we throw the error now
// because this likely is a serious network error.
if (responseMessage.HasError)
throw new NetworkException("Rollback wrote failed: " + responseMessage.ErrorMessage);
}
// Retry,
if (tryCount > 0)
return DoPersist(sequence, tryCount - 1);
// Otherwise we fail the write
throw new NetworkException(responseMessageStream.ErrorMessage);
}
// If we succeeded without an error, add to the log
successProcess.Add(address);
successProcess.Add(requestMessageStream);
}
}
// Return the references,
return new List<long>(outRefs);
}
private void PublishPath(string pathName, int pathInfoVersion, DataAddress rootNode)
{
// Find the PathInfo object from the path_info_version. If the path
// version is out of date then an exception is generated.
PathInfo pathInfo = service.GetPathInfo(pathName, pathInfoVersion);
service.PostToPath(pathInfo, rootNode);
}
private DataAddress AllocateNode(int nodeSize)
{
if (nodeSize >= 65536)
throw new ArgumentException("node_size too large");
if (nodeSize < 0)
throw new ArgumentException("node_size too small");
long blockId;
int dataId;
lock (allocationLock) {
// Fetch the current block of the end of the address space,
blockId = currentAddressSpaceEnd.BlockId;
// Get the data identifier,
dataId = currentAddressSpaceEnd.DataId;
// The next position,
int nextDataId = dataId;
long nextBlockId = blockId;
++nextDataId;
if (nextDataId >= 16384) {
nextDataId = 0;
++nextBlockId;
}
// Create the new end address
currentAddressSpaceEnd = new DataAddress(nextBlockId, nextDataId);
}
// Return the data address,
return new DataAddress(blockId, dataId);
}
private DataAddress[] GetPathRootsSince(PathInfo pathInfo, DataAddress root)
{
// Fetch the path access object for the given name.
PathAccess pathFile = GetPathAccess(pathInfo.PathName);
return pathFile.GetPathRootsSince(root);
}
private void UpdateAddressSpaceEnd()
{
lock (blockDbWriteLock) {
ITransaction transaction = blockDatabase.CreateTransaction();
try {
// Get the map,
BlockServerTable blockServerTable = new BlockServerTable(transaction.GetFile(BlockServerKey, FileAccess.Read));
// Set the 'current address space end' object with a value that is
// past the end of the address space.
// Fetch the last block added,
DataAddress addressSpaceEnd = new DataAddress(0, 0);
// If the map is empty,
if (blockServerTable.Count != 0) {
long lastBlockId = blockServerTable.LastBlockId;
addressSpaceEnd = new DataAddress(lastBlockId + 1024, 0);
}
lock (allocationLock) {
if (currentAddressSpaceEnd == null) {
currentAddressSpaceEnd = addressSpaceEnd;
} else {
currentAddressSpaceEnd = currentAddressSpaceEnd.Max(addressSpaceEnd);
}
}
} finally {
blockDatabase.Dispose(transaction);
}
}
}
public ITransaction CreateTransaction(DataAddress rootNode)
{
// Create the transaction object and return it,
return(treeSystem.CreateTransaction(rootNode));
}