private void MoveBranchNode(Page parentPage, Page from, Page to) { Debug.Assert(from.IsBranch); var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry); var fromNode = from.GetNode(from.LastSearchPosition); long pageNum = fromNode->PageNumber; var itemsMoved = _tx.Pager.Get(_tx, pageNum).ItemCount; from.ItemCount -= itemsMoved; to.ItemCount += itemsMoved; if (to.LastSearchPosition == 0) { // cannot add to left implicit side, adjust by moving the left node // to the right by one, then adding the new one as the left var implicitLeftKey = GetActualKey(to, 0); var leftPageNumber = to.GetNode(0)->PageNumber; to.AddNode(1, implicitLeftKey, -1, leftPageNumber); to.AddNode(0, Slice.BeforeAllKeys, -1, pageNum); to.RemoveNode(1); } else { to.AddNode(to.LastSearchPosition, originalFromKeyStart, -1, pageNum); } if (from.LastSearchPositionOrLastEntry == 0) { // cannot just remove the left node, need to adjust those var rightPageNumber = from.GetNode(1)->PageNumber; from.RemoveNode(0); // remove the original node from.RemoveNode(0); // remove the next node from.AddNode(0, Slice.BeforeAllKeys, -1, rightPageNumber); Debug.Assert(from.NumberOfEntries >= 2); } else { from.RemoveNode(from.LastSearchPositionOrLastEntry); } var pos = parentPage.LastSearchPositionOrLastEntry; parentPage.RemoveNode(pos); var newKey = GetActualKey(to, 0); // get the next smallest key it has now var pageNumber = to.PageNumber; if (parentPage.GetNode(0)->PageNumber == to.PageNumber) { pageNumber = from.PageNumber; newKey = GetActualKey(from, 0); } parentPage.AddNode(pos, newKey, -1, pageNumber); }
private void MoveBranchNode(Page parentPage, Page from, Page to) { Debug.Assert(from.IsBranch); var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry); to.EnsureHasSpaceFor(_tx, originalFromKeyStart, -1); var fromNode = from.GetNode(from.LastSearchPosition); long pageNum = fromNode->PageNumber; if (to.LastSearchPosition == 0) { // cannot add to left implicit side, adjust by moving the left node // to the right by one, then adding the new one as the left var implicitLeftKey = GetActualKey(to, 0); var leftPageNumber = to.GetNode(0)->PageNumber; to.AddPageRefNode(1, implicitLeftKey, leftPageNumber); to.ChangeImplicitRefPageNode(pageNum); // setup the new implicit node } else { to.AddPageRefNode(to.LastSearchPosition, originalFromKeyStart, pageNum); } if (from.LastSearchPositionOrLastEntry == 0) { var rightPageNumber = from.GetNode(1)->PageNumber; from.RemoveNode(0); // remove the original implicit node from.ChangeImplicitRefPageNode(rightPageNumber); // setup the new implicit node Debug.Assert(from.NumberOfEntries >= 2); } else { from.RemoveNode(from.LastSearchPositionOrLastEntry); } var pos = parentPage.LastSearchPositionOrLastEntry; parentPage.RemoveNode(pos); var newKey = GetActualKey(to, 0); // get the next smallest key it has now var pageNumber = to.PageNumber; if (parentPage.GetNode(0)->PageNumber == to.PageNumber) { pageNumber = from.PageNumber; newKey = GetActualKey(from, 0); } parentPage.EnsureHasSpaceFor(_tx, newKey, -1); parentPage.AddPageRefNode(pos, newKey, pageNumber); }
private void MoveLeafNode(Page parentPage, Page from, Page to) { Debug.Assert(from.IsBranch == false); var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry); var fromNode = from.GetNode(from.LastSearchPosition); byte *val = @from.Base + @from.KeysOffsets[@from.LastSearchPosition] + Constants.NodeHeaderSize + originalFromKeyStart.Size; var dataPos = to.AddNode(to.LastSearchPosition, originalFromKeyStart, fromNode->DataSize, -1); NativeMethods.memcpy(dataPos, val, fromNode->DataSize); [email protected]; ++to.ItemCount; from.RemoveNode(from.LastSearchPositionOrLastEntry); var pos = parentPage.LastSearchPositionOrLastEntry; parentPage.RemoveNode(pos); var newKey = GetActualKey(to, 0); // get the next smallest key it has now var pageNumber = to.PageNumber; if (parentPage.GetNode(0)->PageNumber == to.PageNumber) { pageNumber = from.PageNumber; newKey = GetActualKey(from, 0); } parentPage.AddNode(pos, newKey, -1, pageNumber); }
private void MoveLeafNode(Page parentPage, Page from, Page to) { Debug.Assert(from.IsBranch == false); var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry); var fromNode = from.GetNode(from.LastSearchPosition); byte *val = @from.Base + @from.KeysOffsets[@from.LastSearchPosition] + Constants.NodeHeaderSize + originalFromKeyStart.Size; var nodeVersion = fromNode->Version; // every time new node is allocated the version is increased, but in this case we do not want to increase it if (nodeVersion > 0) { nodeVersion -= 1; } byte *dataPos; switch (fromNode->Flags) { case NodeFlags.PageRef: to.EnsureHasSpaceFor(_tx, originalFromKeyStart, -1); dataPos = to.AddPageRefNode(to.LastSearchPosition, originalFromKeyStart, fromNode->PageNumber); break; case NodeFlags.Data: to.EnsureHasSpaceFor(_tx, originalFromKeyStart, fromNode->DataSize); dataPos = to.AddDataNode(to.LastSearchPosition, originalFromKeyStart, fromNode->DataSize, nodeVersion); break; case NodeFlags.MultiValuePageRef: to.EnsureHasSpaceFor(_tx, originalFromKeyStart, fromNode->DataSize); dataPos = to.AddMultiValueNode(to.LastSearchPosition, originalFromKeyStart, fromNode->DataSize, nodeVersion); break; default: throw new NotSupportedException("Invalid node type to move: " + fromNode->Flags); } if (dataPos != null) { NativeMethods.memcpy(dataPos, val, fromNode->DataSize); } from.RemoveNode(from.LastSearchPositionOrLastEntry); var pos = parentPage.LastSearchPositionOrLastEntry; parentPage.RemoveNode(pos); var newKey = GetActualKey(to, 0); // get the next smallest key it has now var pageNumber = to.PageNumber; if (parentPage.GetNode(0)->PageNumber == to.PageNumber) { pageNumber = from.PageNumber; newKey = GetActualKey(from, 0); } parentPage.EnsureHasSpaceFor(_tx, newKey, -1); parentPage.AddPageRefNode(pos, newKey, pageNumber); }
public byte *Execute() { var rightPage = Tree.NewPage(_tx, _page.Flags, 1); _txInfo.RecordNewPage(_page, 1); rightPage.Flags = _page.Flags; if (_cursor.PageCount == 0) // we need to do a root split { var newRootPage = Tree.NewPage(_tx, PageFlags.Branch, 1); _cursor.Push(newRootPage); _txInfo.RootPageNumber = newRootPage.PageNumber; _txInfo.State.Depth++; _txInfo.RecordNewPage(newRootPage, 1); // now add implicit left page newRootPage.AddNode(0, Slice.BeforeAllKeys, -1, _page.PageNumber); _parentPage = newRootPage; _parentPage.LastSearchPosition++; _parentPage.ItemCount = _page.ItemCount; } else { // we already popped the page, so the current one on the stack is what the parent of the page _parentPage = _cursor.CurrentPage; } if (_page.LastSearchPosition >= _page.NumberOfEntries) { // when we get a split at the end of the page, we take that as a hint that the user is doing // sequential inserts, at that point, we are going to keep the current page as is and create a new // page, this will allow us to do minimal amount of work to get the best density byte *pos; if (_page.IsBranch) { // here we steal the last entry from the current page so we maintain the implicit null left entry var node = _page.GetNode(_page.NumberOfEntries - 1); Debug.Assert(node->Flags == NodeFlags.PageRef); var itemsMoved = _tx.Pager.Get(_tx, node->PageNumber).ItemCount; rightPage.AddNode(0, Slice.Empty, -1, node->PageNumber); pos = rightPage.AddNode(1, _newKey, _len, _pageNumber); rightPage.ItemCount = itemsMoved; AddSeperatorToParentPage(rightPage, new Slice(node)); _page.RemoveNode(_page.NumberOfEntries - 1); _page.ItemCount -= itemsMoved; } else { AddSeperatorToParentPage(rightPage, _newKey); pos = rightPage.AddNode(0, _newKey, _len, _pageNumber); } _cursor.Push(rightPage); IncrementItemCountIfNecessary(); return(pos); } return(SplitPageInHalf(rightPage)); }
private void RemoveLeafNode(Page page, out ushort nodeVersion) { var node = page.GetNode(page.LastSearchPosition); nodeVersion = node->Version; if (node->Flags == (NodeFlags.PageRef)) // this is an overflow pointer { var overflowPage = _tx.GetReadOnlyPage(node->PageNumber); FreePage(overflowPage); } page.RemoveNode(page.LastSearchPosition); }
private void MergePages(Page parentPage, Page left, Page right) { for (int i = 0; i < right.NumberOfEntries; i++) { right.LastSearchPosition = i; var key = GetActualKey(right, right.LastSearchPositionOrLastEntry); var node = right.GetNode(i); left.CopyNodeDataToEndOfPage(node, key); } left.ItemCount += right.ItemCount; parentPage.RemoveNode(parentPage.LastSearchPositionOrLastEntry); // unlink the right sibling _tx.FreePage(right.PageNumber); }
private void RemoveLeafNode(Page page, out ushort nodeVersion) { var node = page.GetNode(page.LastSearchPosition); nodeVersion = node->Version; if (node->Flags == (NodeFlags.PageRef)) // this is an overflow pointer { var overflowPage = _tx.GetReadOnlyPage(node->PageNumber); var numberOfPages = _tx.DataPager.GetNumberOfOverflowPages(overflowPage.OverflowSize); for (int i = 0; i < numberOfPages; i++) { _tx.FreePage(overflowPage.PageNumber + i); } State.OverflowPages -= numberOfPages; State.PageCount -= numberOfPages; } page.RemoveNode(page.LastSearchPosition); }
private void RemoveLeafNode(Transaction tx, Cursor cursor, Page page) { var node = page.GetNode(page.LastSearchPosition); if (node->Flags == (NodeFlags.PageRef)) // this is an overflow pointer { var overflowPage = tx.GetReadOnlyPage(node->PageNumber); var numberOfPages = GetNumberOfOverflowPages(tx, overflowPage.OverflowSize); for (int i = 0; i < numberOfPages; i++) { tx.FreePage(overflowPage.PageNumber + i); } var txInfo = tx.GetTreeInformation(this); txInfo.State.OverflowPages -= numberOfPages; txInfo.State.PageCount -= numberOfPages; } page.RemoveNode(page.LastSearchPosition); cursor.DecrementItemCount(); }
private bool TryMergePages(Page parentPage, Page left, Page right) { TemporaryPage tmp; using (_tx.Environment.GetTemporaryPage(_tx, out tmp)) { var mergedPage = tmp.GetTempPage(left.KeysPrefixed); Memory.Copy(mergedPage.Base, left.Base, left.PageSize); var previousSearchPosition = right.LastSearchPosition; for (int i = 0; i < right.NumberOfEntries; i++) { right.LastSearchPosition = i; var key = GetActualKey(right, right.LastSearchPositionOrLastEntry); var node = right.GetNode(i); var prefixedKey = mergedPage.PrepareKeyToInsert(key, mergedPage.NumberOfEntries); if (mergedPage.HasSpaceFor(_tx, SizeOf.NodeEntryWithAnotherKey(node, prefixedKey) + Constants.NodeOffsetSize + SizeOf.NewPrefix(prefixedKey)) == false) { right.LastSearchPosition = previousSearchPosition; //previous position --> prevent mutation of parameter return(false); } mergedPage.CopyNodeDataToEndOfPage(node, prefixedKey); } Memory.Copy(left.Base, mergedPage.Base, left.PageSize); } parentPage.RemoveNode(parentPage.LastSearchPositionOrLastEntry); // unlink the right sibling _tree.FreePage(right); return(true); }
public byte *Execute() { Page rightPage = _tree.NewPage(_page.Flags, 1); if (_cursor.PageCount == 0) // we need to do a root split { Page newRootPage = _tree.NewPage(_tree.KeysPrefixing ? PageFlags.Branch | PageFlags.KeysPrefixed : PageFlags.Branch, 1); _cursor.Push(newRootPage); _treeState.RootPageNumber = newRootPage.PageNumber; _treeState.Depth++; // now add implicit left page newRootPage.AddPageRefNode(0, _tree.KeysPrefixing ? (MemorySlice)PrefixedSlice.BeforeAllKeys : Slice.BeforeAllKeys, _page.PageNumber); _parentPage = newRootPage; _parentPage.LastSearchPosition++; } else { // we already popped the page, so the current one on the stack is the parent of the page if (_tree.Name == Constants.FreeSpaceTreeName) { // a special case for FreeSpaceTree because the allocation of a new page called above // can cause a delete of a free space section resulting in a run of the tree rebalancer // and here the parent page that exists in cursor can be outdated _parentPage = _tx.ModifyPage(_cursor.CurrentPage.PageNumber, _tree, null); // pass _null_ to make sure we'll get the most updated parent page _parentPage.LastSearchPosition = _cursor.CurrentPage.LastSearchPosition; _parentPage.LastMatch = _cursor.CurrentPage.LastMatch; } else { _parentPage = _tx.ModifyPage(_cursor.CurrentPage.PageNumber, _tree, _cursor.CurrentPage); } _cursor.Update(_cursor.Pages.First, _parentPage); } if (_page.IsLeaf) { _tree.ClearRecentFoundPages(); } if (_tree.Name == Constants.FreeSpaceTreeName) { // we need to refresh the LastSearchPosition of the split page which is used by the free space handling // because the allocation of a new page called above could remove some sections // from the page that is being split _page.NodePositionFor(_newKey); } if (_page.LastSearchPosition >= _page.NumberOfEntries) { // when we get a split at the end of the page, we take that as a hint that the user is doing // sequential inserts, at that point, we are going to keep the current page as is and create a new // page, this will allow us to do minimal amount of work to get the best density Page branchOfSeparator; byte *pos; if (_page.IsBranch) { if (_page.NumberOfEntries > 2) { // here we steal the last entry from the current page so we maintain the implicit null left entry NodeHeader *node = _page.GetNode(_page.NumberOfEntries - 1); Debug.Assert(node->Flags == NodeFlags.PageRef); rightPage.AddPageRefNode(0, _tree.KeysPrefixing ? (MemorySlice)PrefixedSlice.BeforeAllKeys : Slice.BeforeAllKeys, node->PageNumber); pos = AddNodeToPage(rightPage, 1); var separatorKey = _page.GetNodeKey(node); AddSeparatorToParentPage(rightPage.PageNumber, separatorKey, out branchOfSeparator); _page.RemoveNode(_page.NumberOfEntries - 1); } else { _tree.FreePage(rightPage); // return the unnecessary right page pos = AddSeparatorToParentPage(_pageNumber, _newKey, out branchOfSeparator); if (_cursor.CurrentPage.PageNumber != branchOfSeparator.PageNumber) { _cursor.Push(branchOfSeparator); } return(pos); } } else { AddSeparatorToParentPage(rightPage.PageNumber, _newKey, out branchOfSeparator); pos = AddNodeToPage(rightPage, 0); } _cursor.Push(rightPage); return(pos); } return(SplitPageInHalf(rightPage)); }
public void MultiAdd(Slice key, Slice value, ushort? version = null) { if (value == null) throw new ArgumentNullException("value"); int maxNodeSize = _tx.DataPager.MaxNodeSize; if (value.Size > maxNodeSize) throw new ArgumentException( "Cannot add a value to child tree that is over " + maxNodeSize + " bytes in size", "value"); if (value.Size == 0) throw new ArgumentException("Cannot add empty value to child tree"); State.IsModified = true; Lazy<Cursor> lazy; var page = FindPageFor(key, out lazy); if ((page == null || page.LastMatch != 0)) { MultiAddOnNewValue(_tx, key, value, version, maxNodeSize); return; } page = _tx.ModifyPage(page.PageNumber, page); var item = page.GetNode(page.LastSearchPosition); // already was turned into a multi tree, not much to do here if (item->Flags == NodeFlags.MultiValuePageRef) { var existingTree = OpenOrCreateMultiValueTree(_tx, key, item); existingTree.DirectAdd(value, 0, version: version); return; } byte* nestedPagePtr; if (item->Flags == NodeFlags.PageRef) { var overFlowPage = _tx.ModifyPage(item->PageNumber, null); nestedPagePtr = overFlowPage.Base + Constants.PageHeaderSize; } else { nestedPagePtr = NodeHeader.DirectAccess(_tx, item); } var nestedPage = new Page(nestedPagePtr, "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item)); var existingItem = nestedPage.Search(value); if (nestedPage.LastMatch != 0) existingItem = null;// not an actual match, just greater than ushort previousNodeRevision = existingItem != null ? existingItem->Version : (ushort)0; CheckConcurrency(key, value, version, previousNodeRevision, TreeActionType.Add); if (existingItem != null) { // maybe same value added twice? var tmpKey = new Slice(item); if (tmpKey.Compare(value) == 0) return; // already there, turning into a no-op nestedPage.RemoveNode(nestedPage.LastSearchPosition); } if (nestedPage.HasSpaceFor(_tx, value, 0)) { // we are now working on top of the modified root page, we can just modify the memory directly nestedPage.AddDataNode(nestedPage.LastSearchPosition, value, 0, previousNodeRevision); return; } int pageSize = nestedPage.CalcSizeUsed() + Constants.PageHeaderSize; var newRequiredSize = pageSize + nestedPage.GetRequiredSpace(value, 0); if (newRequiredSize <= maxNodeSize) { // we can just expand the current value... no need to create a nested tree yet var actualPageSize = (ushort)Math.Min(Utils.NearestPowerOfTwo(newRequiredSize), maxNodeSize); ExpandMultiTreeNestedPageSize(_tx, key, value, nestedPagePtr, actualPageSize, item->DataSize); return; } // we now have to convert this into a tree instance, instead of just a nested page var tree = Create(_tx, TreeFlags.MultiValue); for (int i = 0; i < nestedPage.NumberOfEntries; i++) { var existingValue = nestedPage.GetNodeKey(i); tree.DirectAdd(existingValue, 0); } tree.DirectAdd(value, 0, version: version); _tx.AddMultiValueTree(this, key, tree); // we need to record that we switched to tree mode here, so the next call wouldn't also try to create the tree again DirectAdd(key, sizeof (TreeRootHeader), NodeFlags.MultiValuePageRef); }
public void MultiDelete(Slice key, Slice value, ushort? version = null) { State.IsModified = true; Lazy<Cursor> lazy; var page = FindPageFor(key, out lazy); if (page == null || page.LastMatch != 0) { return; //nothing to delete - key not found } page = _tx.ModifyPage(page.PageNumber, page); var item = page.GetNode(page.LastSearchPosition); if (item->Flags == NodeFlags.MultiValuePageRef) //multi-value tree exists { var tree = OpenOrCreateMultiValueTree(_tx, key, item); tree.Delete(value, version); // previously, we would convert back to a simple model if we dropped to a single entry // however, it doesn't really make sense, once you got enough values to go to an actual nested // tree, you are probably going to remain that way, or be removed completely. if (tree.State.EntriesCount != 0) return; _tx.TryRemoveMultiValueTree(this, key); _tx.FreePage(tree.State.RootPageNumber); Delete(key); } else // we use a nested page here { var nestedPage = new Page(NodeHeader.DirectAccess(_tx, item), "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item)); var nestedItem = nestedPage.Search(value); if (nestedItem == null) // value not found return; byte* nestedPagePtr; if (item->Flags == NodeFlags.PageRef) { var overFlowPage = _tx.ModifyPage(item->PageNumber, null); nestedPagePtr = overFlowPage.Base + Constants.PageHeaderSize; } else { nestedPagePtr = NodeHeader.DirectAccess(_tx, item); } nestedPage = new Page(nestedPagePtr, "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item)) { LastSearchPosition = nestedPage.LastSearchPosition }; CheckConcurrency(key, value, version, nestedItem->Version, TreeActionType.Delete); nestedPage.RemoveNode(nestedPage.LastSearchPosition); if (nestedPage.NumberOfEntries == 0) Delete(key); } }
private void MoveBranchNode(Page parentPage, Page from, Page to) { Debug.Assert(from.IsBranch); var originalFromKey = to.PrepareKeyToInsert(GetActualKey(from, from.LastSearchPositionOrLastEntry), to.LastSearchPosition); to.EnsureHasSpaceFor(_tx, originalFromKey, -1); var fromNode = from.GetNode(from.LastSearchPosition); long pageNum = fromNode->PageNumber; if (to.LastSearchPosition == 0) { // cannot add to left implicit side, adjust by moving the left node // to the right by one, then adding the new one as the left NodeHeader* actualKeyNode; var implicitLeftKey = GetActualKey(to, 0, out actualKeyNode); var implicitLeftNode = to.GetNode(0); var leftPageNumber = implicitLeftNode->PageNumber; MemorySlice implicitLeftKeyToInsert; if (implicitLeftNode == actualKeyNode) { // no need to create a prefix, just use the existing prefixed key from the node // this also prevents from creating a prefix which is the full key given in 'implicitLeftKey' if (_tree.KeysPrefixing) implicitLeftKeyToInsert = new PrefixedSlice(actualKeyNode); else implicitLeftKeyToInsert = new Slice(actualKeyNode); } else implicitLeftKeyToInsert = to.PrepareKeyToInsert(implicitLeftKey, 1); to.EnsureHasSpaceFor(_tx, implicitLeftKeyToInsert, -1); to.AddPageRefNode(1, implicitLeftKeyToInsert, leftPageNumber); to.ChangeImplicitRefPageNode(pageNum); // setup the new implicit node } else { to.AddPageRefNode(to.LastSearchPosition, originalFromKey, pageNum); } if (from.LastSearchPositionOrLastEntry == 0) { var rightPageNumber = from.GetNode(1)->PageNumber; from.RemoveNode(0); // remove the original implicit node from.ChangeImplicitRefPageNode(rightPageNumber); // setup the new implicit node Debug.Assert(from.NumberOfEntries >= 2); } else { from.RemoveNode(from.LastSearchPositionOrLastEntry); } var pos = parentPage.LastSearchPositionOrLastEntry; parentPage.RemoveNode(pos); var newSeparatorKey = GetActualKey(to, 0); // get the next smallest key it has now var pageNumber = to.PageNumber; if (parentPage.GetNode(0)->PageNumber == to.PageNumber) { pageNumber = from.PageNumber; newSeparatorKey = GetActualKey(from, 0); } AddSeparatorToParentPage(parentPage, pageNumber, newSeparatorKey, pos); }
private void MoveLeafNode(Page parentPage, Page from, Page to) { Debug.Assert(from.IsBranch == false); var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry); var fromNode = from.GetNode(from.LastSearchPosition); byte* val = @from.Base + @from.KeysOffsets[@from.LastSearchPosition] + Constants.NodeHeaderSize + originalFromKeyStart.Size; var nodeVersion = fromNode->Version; // every time new node is allocated the version is increased, but in this case we do not want to increase it if (nodeVersion > 0) nodeVersion -= 1; var prefixedOriginalFromKey = to.PrepareKeyToInsert(originalFromKeyStart, to.LastSearchPosition); byte* dataPos; var fromDataSize = fromNode->DataSize; switch (fromNode->Flags) { case NodeFlags.PageRef: to.EnsureHasSpaceFor(_tx, prefixedOriginalFromKey, -1); dataPos = to.AddPageRefNode(to.LastSearchPosition, prefixedOriginalFromKey, fromNode->PageNumber); break; case NodeFlags.Data: to.EnsureHasSpaceFor(_tx, prefixedOriginalFromKey, fromDataSize); dataPos = to.AddDataNode(to.LastSearchPosition, prefixedOriginalFromKey, fromDataSize, nodeVersion); break; case NodeFlags.MultiValuePageRef: to.EnsureHasSpaceFor(_tx, prefixedOriginalFromKey, fromDataSize); dataPos = to.AddMultiValueNode(to.LastSearchPosition, prefixedOriginalFromKey, fromDataSize, nodeVersion); break; default: throw new NotSupportedException("Invalid node type to move: " + fromNode->Flags); } if(dataPos != null && fromDataSize > 0) Memory.Copy(dataPos, val, fromDataSize); from.RemoveNode(from.LastSearchPositionOrLastEntry); var pos = parentPage.LastSearchPositionOrLastEntry; parentPage.RemoveNode(pos); var newSeparatorKey = GetActualKey(to, 0); // get the next smallest key it has now var pageNumber = to.PageNumber; if (parentPage.GetNode(0)->PageNumber == to.PageNumber) { pageNumber = from.PageNumber; newSeparatorKey = GetActualKey(from, 0); } AddSeparatorToParentPage(parentPage, pageNumber, newSeparatorKey, pos); }
private bool TryMergePages(Page parentPage, Page left, Page right) { TemporaryPage tmp; using (_tx.Environment.GetTemporaryPage(_tx, out tmp)) { var mergedPage = tmp.GetTempPage(left.KeysPrefixed); Memory.Copy(mergedPage.Base, left.Base, left.PageSize); var previousSearchPosition = right.LastSearchPosition; for (int i = 0; i < right.NumberOfEntries; i++) { right.LastSearchPosition = i; var key = GetActualKey(right, right.LastSearchPositionOrLastEntry); var node = right.GetNode(i); var prefixedKey = mergedPage.PrepareKeyToInsert(key, mergedPage.NumberOfEntries); if (mergedPage.HasSpaceFor(_tx, SizeOf.NodeEntryWithAnotherKey(node, prefixedKey) + Constants.NodeOffsetSize + SizeOf.NewPrefix(prefixedKey)) == false) { right.LastSearchPosition = previousSearchPosition; //previous position --> prevent mutation of parameter return false; } mergedPage.CopyNodeDataToEndOfPage(node, prefixedKey); } Memory.Copy(left.Base, mergedPage.Base, left.PageSize); } parentPage.RemoveNode(parentPage.LastSearchPositionOrLastEntry); // unlink the right sibling _tx.FreePage(right.PageNumber); return true; }
private void RemoveLeafNode(Transaction tx, Page page, out ushort nodeVersion) { var node = page.GetNode(page.LastSearchPosition); nodeVersion = node->Version; if (node->Flags == (NodeFlags.PageRef)) // this is an overflow pointer { var overflowPage = tx.GetReadOnlyPage(node->PageNumber); var numberOfPages = tx.DataPager.GetNumberOfOverflowPages(overflowPage.OverflowSize); for (int i = 0; i < numberOfPages; i++) { tx.FreePage(overflowPage.PageNumber + i); } State.OverflowPages -= numberOfPages; State.PageCount -= numberOfPages; } page.RemoveNode(page.LastSearchPosition); }
public byte *Execute() { using (_tree.IsFreeSpaceTree ? _tx.Environment.FreeSpaceHandling.Disable() : null) { Page rightPage = _tree.NewPage(_page.Flags, 1); if (_cursor.PageCount == 0) // we need to do a root split { Page newRootPage = _tree.NewPage(_tree.KeysPrefixing ? PageFlags.Branch | PageFlags.KeysPrefixed : PageFlags.Branch, 1); _cursor.Push(newRootPage); _tree.State.RootPageNumber = newRootPage.PageNumber; _tree.State.Depth++; // now add implicit left page newRootPage.AddPageRefNode(0, _tree.KeysPrefixing ? (MemorySlice)PrefixedSlice.BeforeAllKeys : Slice.BeforeAllKeys, _page.PageNumber); _parentPage = newRootPage; _parentPage.LastSearchPosition++; } else { // we already popped the page, so the current one on the stack is the parent of the page _parentPage = _tx.ModifyPage(_cursor.CurrentPage.PageNumber, _tree, _cursor.CurrentPage); _cursor.Update(_cursor.Pages.First, _parentPage); } if (_page.IsLeaf) { _tree.ClearRecentFoundPages(); } if (_page.LastSearchPosition >= _page.NumberOfEntries) { // when we get a split at the end of the page, we take that as a hint that the user is doing // sequential inserts, at that point, we are going to keep the current page as is and create a new // page, this will allow us to do minimal amount of work to get the best density Page branchOfSeparator; byte *pos; if (_page.IsBranch) { if (_page.NumberOfEntries > 2) { // here we steal the last entry from the current page so we maintain the implicit null left entry NodeHeader *node = _page.GetNode(_page.NumberOfEntries - 1); Debug.Assert(node->Flags == NodeFlags.PageRef); rightPage.AddPageRefNode(0, _tree.KeysPrefixing ? (MemorySlice)PrefixedSlice.BeforeAllKeys : Slice.BeforeAllKeys, node->PageNumber); pos = AddNodeToPage(rightPage, 1); var separatorKey = _page.GetNodeKey(node); AddSeparatorToParentPage(rightPage.PageNumber, separatorKey, out branchOfSeparator); _page.RemoveNode(_page.NumberOfEntries - 1); } else { _tree.FreePage(rightPage); // return the unnecessary right page pos = AddSeparatorToParentPage(_pageNumber, _newKey, out branchOfSeparator); if (_cursor.CurrentPage.PageNumber != branchOfSeparator.PageNumber) { _cursor.Push(branchOfSeparator); } return(pos); } } else { AddSeparatorToParentPage(rightPage.PageNumber, _newKey, out branchOfSeparator); pos = AddNodeToPage(rightPage, 0); } _cursor.Push(rightPage); return(pos); } return(SplitPageInHalf(rightPage)); } }
private void MergePages(Page parentPage, Page left, Page right) { for (int i = 0; i < right.NumberOfEntries; i++) { right.LastSearchPosition = i; var key = GetActualKey(right, right.LastSearchPositionOrLastEntry); var node = right.GetNode(i); left.CopyNodeDataToEndOfPage(node, key); } parentPage.RemoveNode(parentPage.LastSearchPositionOrLastEntry); // unlink the right sibling _tx.FreePage(right.PageNumber); }
private void MoveBranchNode(Page parentPage, Page from, Page to) { Debug.Assert(from.IsBranch); var originalFromKeyStart = GetActualKey(from, from.LastSearchPositionOrLastEntry); to.EnsureHasSpaceFor(_tx, originalFromKeyStart, -1); var fromNode = from.GetNode(from.LastSearchPosition); long pageNum = fromNode->PageNumber; if (to.LastSearchPosition == 0) { // cannot add to left implicit side, adjust by moving the left node // to the right by one, then adding the new one as the left var implicitLeftKey = GetActualKey(to, 0); var leftPageNumber = to.GetNode(0)->PageNumber; to.AddPageRefNode(1, implicitLeftKey, leftPageNumber); to.AddPageRefNode(0, Slice.BeforeAllKeys, pageNum); to.RemoveNode(1); } else { to.AddPageRefNode(to.LastSearchPosition, originalFromKeyStart, pageNum); } if (from.LastSearchPositionOrLastEntry == 0) { // cannot just remove the left node, need to adjust those var rightPageNumber = from.GetNode(1)->PageNumber; from.RemoveNode(0); // remove the original implicit node from.RemoveNode(0); // remove the next node that we now turned into implicit from.EnsureHasSpaceFor(_tx, Slice.BeforeAllKeys, -1); from.AddPageRefNode(0, Slice.BeforeAllKeys, rightPageNumber); Debug.Assert(from.NumberOfEntries >= 2); } else { from.RemoveNode(from.LastSearchPositionOrLastEntry); } var pos = parentPage.LastSearchPositionOrLastEntry; parentPage.RemoveNode(pos); var newKey = GetActualKey(to, 0); // get the next smallest key it has now var pageNumber = to.PageNumber; if (parentPage.GetNode(0)->PageNumber == to.PageNumber) { pageNumber = from.PageNumber; newKey = GetActualKey(from, 0); } parentPage.EnsureHasSpaceFor(_tx, newKey, -1); parentPage.AddPageRefNode(pos, newKey, pageNumber); }
public void MultiDelete(Slice key, Slice value, ushort?version = null) { State.IsModified = true; Lazy <Cursor> lazy; NodeHeader * node; var page = FindPageFor(key, out node, out lazy); if (page == null || page.LastMatch != 0) { return; //nothing to delete - key not found } page = _tx.ModifyPage(page.PageNumber, page); var item = page.GetNode(page.LastSearchPosition); if (item->Flags == NodeFlags.MultiValuePageRef) //multi-value tree exists { var tree = OpenMultiValueTree(_tx, key, item); tree.Delete(value, version); // previously, we would convert back to a simple model if we dropped to a single entry // however, it doesn't really make sense, once you got enough values to go to an actual nested // tree, you are probably going to remain that way, or be removed completely. if (tree.State.EntriesCount != 0) { return; } _tx.TryRemoveMultiValueTree(this, key); _tx.FreePage(tree.State.RootPageNumber); Delete(key); } else // we use a nested page here { var nestedPage = new Page(NodeHeader.DirectAccess(_tx, item), "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item)); var nestedItem = nestedPage.Search(value); if (nestedItem == null) // value not found { return; } byte *nestedPagePtr; if (item->Flags == NodeFlags.PageRef) { var overFlowPage = _tx.ModifyPage(item->PageNumber, null); nestedPagePtr = overFlowPage.Base + Constants.PageHeaderSize; } else { nestedPagePtr = NodeHeader.DirectAccess(_tx, item); } nestedPage = new Page(nestedPagePtr, "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item)) { LastSearchPosition = nestedPage.LastSearchPosition }; CheckConcurrency(key, value, version, nestedItem->Version, TreeActionType.Delete); nestedPage.RemoveNode(nestedPage.LastSearchPosition); if (nestedPage.NumberOfEntries == 0) { Delete(key); } } }
public void MultiAdd(Slice key, Slice value, ushort?version = null) { if (value == null) { throw new ArgumentNullException("value"); } int maxNodeSize = AbstractPager.NodeMaxSize; if (value.Size > maxNodeSize) { throw new ArgumentException( "Cannot add a value to child tree that is over " + maxNodeSize + " bytes in size", "value"); } if (value.Size == 0) { throw new ArgumentException("Cannot add empty value to child tree"); } State.IsModified = true; Lazy <Cursor> lazy; NodeHeader * node; var page = FindPageFor(key, out node, out lazy); if ((page == null || page.LastMatch != 0)) { MultiAddOnNewValue(_tx, key, value, version, maxNodeSize); return; } page = _tx.ModifyPage(page.PageNumber, page); var item = page.GetNode(page.LastSearchPosition); // already was turned into a multi tree, not much to do here if (item->Flags == NodeFlags.MultiValuePageRef) { var existingTree = OpenMultiValueTree(_tx, key, item); existingTree.DirectAdd(value, 0, version: version); return; } byte *nestedPagePtr; if (item->Flags == NodeFlags.PageRef) { var overFlowPage = _tx.ModifyPage(item->PageNumber, null); nestedPagePtr = overFlowPage.Base + Constants.PageHeaderSize; } else { nestedPagePtr = NodeHeader.DirectAccess(_tx, item); } var nestedPage = new Page(nestedPagePtr, "multi tree", (ushort)NodeHeader.GetDataSize(_tx, item)); var existingItem = nestedPage.Search(value); if (nestedPage.LastMatch != 0) { existingItem = null; // not an actual match, just greater than } ushort previousNodeRevision = existingItem != null ? existingItem->Version : (ushort)0; CheckConcurrency(key, value, version, previousNodeRevision, TreeActionType.Add); if (existingItem != null) { // maybe same value added twice? var tmpKey = page.GetNodeKey(item); if (tmpKey.Compare(value) == 0) { return; // already there, turning into a no-op } nestedPage.RemoveNode(nestedPage.LastSearchPosition); } var valueToInsert = nestedPage.PrepareKeyToInsert(value, nestedPage.LastSearchPosition); if (nestedPage.HasSpaceFor(_tx, valueToInsert, 0)) { // we are now working on top of the modified root page, we can just modify the memory directly nestedPage.AddDataNode(nestedPage.LastSearchPosition, valueToInsert, 0, previousNodeRevision); return; } int pageSize = nestedPage.CalcSizeUsed() + Constants.PageHeaderSize; var newRequiredSize = pageSize + nestedPage.GetRequiredSpace(valueToInsert, 0); if (newRequiredSize <= maxNodeSize) { // we can just expand the current value... no need to create a nested tree yet var actualPageSize = (ushort)Math.Min(Utils.NearestPowerOfTwo(newRequiredSize), maxNodeSize); var currentDataSize = NodeHeader.GetDataSize(_tx, item); ExpandMultiTreeNestedPageSize(_tx, key, value, nestedPagePtr, actualPageSize, currentDataSize); return; } // we now have to convert this into a tree instance, instead of just a nested page var tree = Create(_tx, KeysPrefixing, TreeFlags.MultiValue); for (int i = 0; i < nestedPage.NumberOfEntries; i++) { var existingValue = nestedPage.GetNodeKey(i); tree.DirectAdd(existingValue, 0); } tree.DirectAdd(value, 0, version: version); _tx.AddMultiValueTree(this, key, tree); // we need to record that we switched to tree mode here, so the next call wouldn't also try to create the tree again DirectAdd(key, sizeof(TreeRootHeader), NodeFlags.MultiValuePageRef); }
private void MoveBranchNode(Page parentPage, Page from, Page to) { Debug.Assert(from.IsBranch); var originalFromKey = to.PrepareKeyToInsert(GetActualKey(from, from.LastSearchPositionOrLastEntry), to.LastSearchPosition); to.EnsureHasSpaceFor(_tx, originalFromKey, -1); var fromNode = from.GetNode(from.LastSearchPosition); long pageNum = fromNode->PageNumber; if (to.LastSearchPosition == 0) { // cannot add to left implicit side, adjust by moving the left node // to the right by one, then adding the new one as the left NodeHeader *actualKeyNode; var implicitLeftKey = GetActualKey(to, 0, out actualKeyNode); var implicitLeftNode = to.GetNode(0); var leftPageNumber = implicitLeftNode->PageNumber; MemorySlice implicitLeftKeyToInsert; if (implicitLeftNode == actualKeyNode) { // no need to create a prefix, just use the existing prefixed key from the node // this also prevents from creating a prefix which is the full key given in 'implicitLeftKey' if (_tree.KeysPrefixing) { implicitLeftKeyToInsert = new PrefixedSlice(actualKeyNode); } else { implicitLeftKeyToInsert = new Slice(actualKeyNode); } } else { implicitLeftKeyToInsert = to.PrepareKeyToInsert(implicitLeftKey, 1); } to.EnsureHasSpaceFor(_tx, implicitLeftKeyToInsert, -1); to.AddPageRefNode(1, implicitLeftKeyToInsert, leftPageNumber); to.ChangeImplicitRefPageNode(pageNum); // setup the new implicit node } else { to.AddPageRefNode(to.LastSearchPosition, originalFromKey, pageNum); } if (from.LastSearchPositionOrLastEntry == 0) { var rightPageNumber = from.GetNode(1)->PageNumber; from.RemoveNode(0); // remove the original implicit node from.ChangeImplicitRefPageNode(rightPageNumber); // setup the new implicit node Debug.Assert(from.NumberOfEntries >= 2); } else { from.RemoveNode(from.LastSearchPositionOrLastEntry); } var pos = parentPage.LastSearchPositionOrLastEntry; parentPage.RemoveNode(pos); var newSeparatorKey = GetActualKey(to, 0); // get the next smallest key it has now var pageNumber = to.PageNumber; if (parentPage.GetNode(0)->PageNumber == to.PageNumber) { pageNumber = from.PageNumber; newSeparatorKey = GetActualKey(from, 0); } AddSeparatorToParentPage(parentPage, pageNumber, newSeparatorKey, pos); }
public byte *Execute() { Page rightPage = Tree.NewPage(_tx, _page.Flags, 1); _treeState.RecordNewPage(_page, 1); rightPage.Flags = _page.Flags; if (_cursor.PageCount == 0) // we need to do a root split { Page newRootPage = Tree.NewPage(_tx, PageFlags.Branch, 1); _cursor.Push(newRootPage); _treeState.RootPageNumber = newRootPage.PageNumber; _treeState.Depth++; _treeState.RecordNewPage(newRootPage, 1); // now add implicit left page newRootPage.AddPageRefNode(0, Slice.BeforeAllKeys, _page.PageNumber); _parentPage = newRootPage; _parentPage.LastSearchPosition++; } else { // we already popped the page, so the current one on the stack is what the parent of the page _parentPage = _tx.ModifyPage(_cursor.CurrentPage.PageNumber, _cursor.CurrentPage); _cursor.Update(_cursor.Pages.First, _parentPage); } if (_page.IsLeaf) { _tx.ClearRecentFoundPages(_tree); } if (_page.LastSearchPosition >= _page.NumberOfEntries) { // when we get a split at the end of the page, we take that as a hint that the user is doing // sequential inserts, at that point, we are going to keep the current page as is and create a new // page, this will allow us to do minimal amount of work to get the best density byte *pos; if (_page.IsBranch) { // here we steal the last entry from the current page so we maintain the implicit null left entry NodeHeader *node = _page.GetNode(_page.NumberOfEntries - 1); Debug.Assert(node->Flags == NodeFlags.PageRef); rightPage.AddPageRefNode(0, Slice.Empty, node->PageNumber); pos = AddNodeToPage(rightPage, 1); AddSeparatorToParentPage(rightPage, new Slice(node)); _page.RemoveNode(_page.NumberOfEntries - 1); } else { AddSeparatorToParentPage(rightPage, _newKey); pos = AddNodeToPage(rightPage, 0); } _cursor.Push(rightPage); return(pos); } return(SplitPageInHalf(rightPage)); }