private void AddReplicationItemToBatch(ReplicationBatchIndexItem item)
{
// destination already has it
if (item.ChangeVector.GreaterThan(_parent._destinationLastKnownDocumentChangeVector) == false)
{
if (_log.IsInfoEnabled)
{
_log.Info(
$"Skipping replication of {item.Name} because destination has a higher change vector. Source: {item.ChangeVector.Format()} < Dest: {_parent._destinationLastKnownDocumentChangeVectorAsString} ");
}
return;
}
LastEtag = Math.Max(LastEtag, item.Etag);
_orderedReplicaItems.Add(item.Etag, item);
}
public void ExecuteReplicationOnce()
{
_orderedReplicaItems.Clear();
try
{
var sp = Stopwatch.StartNew();
var timeout = Debugger.IsAttached ? 60 * 1000 : 1000;
var configurationContext = _parent._configurationContext;
using (configurationContext.OpenReadTransaction())
{
while (sp.ElapsedMilliseconds < timeout)
{
LastEtag = _parent._lastSentIndexOrTransformerEtag;
_parent.CancellationToken.ThrowIfCancellationRequested();
var indexAndTransformerMetadata = _parent._database.IndexMetadataPersistence.GetAfter(
configurationContext.Transaction.InnerTransaction,
configurationContext, LastEtag + 1, 0, 1024);
using (var stream = new MemoryStream())
{
foreach (var item in indexAndTransformerMetadata)
{
_parent.CancellationToken.ThrowIfCancellationRequested();
stream.Position = 0;
using (var writer = new BlittableJsonTextWriter(configurationContext, stream))
{
switch (item.Type)
{
case IndexEntryType.Index:
var index = _parent._database.IndexStore.GetIndex(item.Id);
if (index == null) //precaution
{
throw new InvalidDataException(
$"Index with name {item.Name} has metadata, but is not at the index store. This is not supposed to happen and is likely a bug.");
}
try
{
IndexProcessor.Export(writer, index, configurationContext, false);
}
catch (InvalidOperationException e)
{
if (_log.IsInfoEnabled)
{
_log.Info(
$"Failed to export index definition for replication. Index name = {item.Name}",
e);
}
}
break;
case IndexEntryType.Transformer:
var transformer = _parent._database.TransformerStore.GetTransformer(item.Id);
if (transformer == null) //precaution
{
throw new InvalidDataException(
$"Transformer with name {item.Name} has metadata, but is not at the transformer store. This is not supposed to happen and is likely a bug.");
}
try
{
TransformerProcessor.Export(writer, transformer,
configurationContext);
}
catch (InvalidOperationException e)
{
if (_log.IsInfoEnabled)
{
_log.Info(
$"Failed to export transformer definition for replication. Transformer name = {item.Name}",
e);
}
}
break;
default:
throw new ArgumentOutOfRangeException(nameof(item),
"Unexpected item type in index/transformer metadata. This is not supposed to happen.");
}
writer.Flush();
stream.Position = 0;
var newItem = new ReplicationBatchIndexItem
{
Name = item.Name,
ChangeVector = item.ChangeVector,
Etag = item.Etag,
Type = (int)item.Type,
Definition =
configurationContext.ReadForMemory(stream,
"Index/Transformer Replication - Reading definition into memory")
};
AddReplicationItemToBatch(newItem);
}
}
}
// if we are at the end, we are done
if (LastEtag <=
_parent._database.IndexMetadataPersistence.ReadLastEtag(
configurationContext.Transaction.InnerTransaction))
{
break;
}
}
if (_log.IsInfoEnabled)
{
_log.Info(
$"Found {_orderedReplicaItems.Count:#,#;;0} indexes/transformers to replicate to {_parent.Destination.Database} @ {_parent.Destination.Url} in {sp.ElapsedMilliseconds:#,#;;0} ms.");
}
_parent.CancellationToken.ThrowIfCancellationRequested();
try
{
using (_parent._documentsContext.OpenReadTransaction())
SendIndexTransformerBatch();
}
catch (Exception e)
{
if (_log.IsInfoEnabled)
{
_log.Info("Failed to send index/transformer replication batch", e);
}
throw;
}
}
}
finally
{
//release memory at the end of the operation
foreach (var item in _orderedReplicaItems)
{
item.Value.Definition.Dispose();
}
_orderedReplicaItems.Clear();
}
}
private unsafe void WriteMetadataToServer(ReplicationBatchIndexItem item)
{
var changeVectorSize = item.ChangeVector.Length * sizeof(ChangeVectorEntry);
var sizeOfNameInBytes = Encoding.UTF8.GetByteCount(item.Name);
var requiredSize = changeVectorSize +
sizeof(int) + // # of change vector entries
sizeof(long) + //size of etag
sizeof(int) + // size of type
sizeof(int) + //size of name
sizeof(int) + //name char count
sizeOfNameInBytes +
item.Definition.Size +
sizeof(int); // size of definition
if (requiredSize > _tempBuffer.Length)
ThrowTooManyChangeVectorEntries(item.Name, item.ChangeVector, requiredSize);
fixed(byte *pTemp = _tempBuffer)
{
int tempBufferPos = 0;
//start writing change vector
fixed(ChangeVectorEntry *pChangeVectorEntries = item.ChangeVector)
{
*(int *)pTemp = item.ChangeVector.Length; //write change vector length
tempBufferPos += sizeof(int);
//write change vector entries
Memory.Copy(pTemp + tempBufferPos, (byte *)pChangeVectorEntries, changeVectorSize);
tempBufferPos += changeVectorSize;
}
//end writing change vector
*(long *)(pTemp + tempBufferPos) = item.Etag; //write etag
tempBufferPos += sizeof(long);
*(int *)(pTemp + tempBufferPos) = item.Type;
tempBufferPos += sizeof(int);
//start writing index/transformer metadata name
*(int *)(pTemp + tempBufferPos) = sizeOfNameInBytes; //write the size of the name string
tempBufferPos += sizeof(int);
*(int *)(pTemp + tempBufferPos) = item.Name.Length;
tempBufferPos += sizeof(int);
//start writing the name string characters
fixed(char *pName = item.Name)
Encoding.UTF8.GetBytes(pName, item.Name.Length, pTemp + tempBufferPos, sizeOfNameInBytes);
tempBufferPos += sizeOfNameInBytes;
//end writing the name string characters
//end writing index/transformer metadata name
//start writing index/transformer definition
//first write index/transformer definition size
*(int *)(pTemp + tempBufferPos) = item.Definition.Size;
tempBufferPos += sizeof(int);
//start writing definition json data
var docReadPos = 0;
while (docReadPos < item.Definition.Size)
{
var sizeToCopy = Math.Min(item.Definition.Size - docReadPos, _tempBuffer.Length - tempBufferPos);
if (sizeToCopy == 0) // buffer is full, need to flush it
{
_stream.Write(_tempBuffer, 0, tempBufferPos);
tempBufferPos = 0;
continue;
}
Memory.Copy(pTemp + tempBufferPos, item.Definition.BasePointer + docReadPos, sizeToCopy);
tempBufferPos += sizeToCopy;
docReadPos += sizeToCopy;
}
//end writing definition json data
//end writing index/transformer definition
_stream.Write(_tempBuffer, 0, tempBufferPos);
}
}
