public void TestCoalesceEmptyTree()
{
const string storeName = "Coalesce.EmptyTree.data";
ulong srcRootId, coalescedRootId;
using(var store = TestUtils.CreateEmptyPageStore(storeName))
{
var tree = new BPlusTree(store);
srcRootId = tree.Save(0, null);
store.Commit(0, null);
}
using(var store = TestUtils.OpenPageStore(storeName, false))
{
var sourceTree = new BPlusTree(store, srcRootId);
Assert.AreEqual(0, sourceTree.Scan(null).Count());
var builder = new BPlusTreeBuilder(store, sourceTree.Configuration);
coalescedRootId = builder.Build(1, sourceTree.Scan(null));
var coalescedTree = new BPlusTree(store, coalescedRootId);
Assert.AreEqual(0, coalescedTree.Scan(null).Count());
store.Commit(1ul, null);
}
using (var store = TestUtils.OpenPageStore(storeName, true))
{
var coalescedTree = new BPlusTree(store, coalescedRootId);
Assert.AreEqual(0, coalescedTree.Scan(null).Count());
}
}
public void TestCoalesceRootLeafNode()
{
const string storeName = "Coalesce.RootLeafNode.data";
ulong srcRootId, targetRootId;
var txnId = 0ul;
using(var store = TestUtils.CreateEmptyPageStore(storeName))
{
var sourceTree = new BPlusTree(0, store);
var config = sourceTree.Configuration;
for (int i = 0; i < config.LeafLoadFactor; i++)
{
sourceTree.Insert(txnId, (ulong)i, BitConverter.GetBytes((ulong)i));
}
sourceTree.DumpStructure();
srcRootId = sourceTree.Save(txnId, null);
store.Commit(txnId, null);
}
using(var store = TestUtils.OpenPageStore(storeName, false))
{
var sourceTree = new BPlusTree(store, srcRootId);
var config = sourceTree.Configuration;
var builder = new BPlusTreeBuilder(store, config);
targetRootId = builder.Build(1, sourceTree.Scan(null));
var targetTree = new BPlusTree(store, targetRootId);
targetTree.DumpStructure();
byte[] valueBuff = new byte[64];
for(int i =0 ; i < config.LeafLoadFactor; i++)
{
Assert.IsTrue(targetTree.Search((ulong)i, valueBuff, null));
Assert.AreEqual((ulong) i, BitConverter.ToUInt64(valueBuff, 0));
}
store.Commit(1, null);
}
using(var store = TestUtils.OpenPageStore(storeName, true))
{
var targetTree = new BPlusTree(store, targetRootId);
var config = targetTree.Configuration;
targetTree.DumpStructure();
byte[] valueBuff = new byte[64];
for (int i = 0; i < config.LeafLoadFactor; i++)
{
Assert.IsTrue(targetTree.Search((ulong)i, valueBuff, null));
Assert.AreEqual((ulong)i, BitConverter.ToUInt64(valueBuff, 0));
}
}
}
private void BuildAndScan(IPageStore pageStore, string pageStoreName, PersistenceType persistenceType, int keyCount)
{
var config = new BPlusTreeConfiguration(8, 64, pageStore.PageSize);
var builder = new BPlusTreeBuilder(pageStore, config);
var treeRoot = builder.Build(1, _testOrderedValues.Take(keyCount));
var treeBeforeSave = new BPlusTree(pageStore, treeRoot);
treeBeforeSave.Save(1, null);
//ValidateScan(treeBeforeSave.Scan(null), keyCount, pageStoreName + " before save");
pageStore.Commit(1, null);
pageStore.Close();
using(var ps = TestUtils.OpenPageStore(pageStoreName, true, persistenceType, 1))
{
var tree = new BPlusTree(ps, treeRoot);
tree.DumpStructure();
ValidateScan(tree.Scan(null), keyCount, pageStoreName + " after save");
ValidateSearch(tree, keyCount, pageStoreName + "after save");
}
}
public void TestCoalesceLeafLoadPlusOne()
{
const string storeName = "Coalesce.LeafLoadPlusOne.data";
ulong srcRootId, targetRootId;
var config = new BPlusTreeConfiguration(8, 64, 4096);
var txnId = 0ul;
using (var store = TestUtils.CreateEmptyPageStore(storeName))
{
var sourceTree = new BPlusTree(store);
for (int i = 0; i < config.LeafLoadFactor + 1; i++)
{
sourceTree.Insert(txnId, (ulong)i, BitConverter.GetBytes((ulong)i));
}
sourceTree.DumpStructure();
srcRootId = sourceTree.Save(txnId, null);
store.Commit(txnId, null);
}
txnId = 1;
using (var store = TestUtils.OpenPageStore(storeName, false))
{
var sourceTree = new BPlusTree(store, srcRootId);
var builder = new BPlusTreeBuilder(store, config);
targetRootId = builder.Build(1, sourceTree.Scan(null));
var targetTree = new BPlusTree(store, targetRootId);
targetTree.DumpStructure();
byte[] valueBuff = new byte[64];
for (int i = 0; i < config.LeafLoadFactor + 1; i++)
{
Assert.IsTrue(targetTree.Search((ulong)i, valueBuff, null));
Assert.AreEqual((ulong)i, BitConverter.ToUInt64(valueBuff, 0));
}
store.Commit(1, null);
}
using (var store = TestUtils.OpenPageStore(storeName, true))
{
var targetTree = new BPlusTree(store, targetRootId);
targetTree.DumpStructure();
byte[] valueBuff = new byte[64];
for (int i = 0; i < config.LeafLoadFactor + 1; i++)
{
Assert.IsTrue(targetTree.Search((ulong)i, valueBuff, null));
Assert.AreEqual((ulong)i, BitConverter.ToUInt64(valueBuff, 0));
}
var root = targetTree.GetNode(targetTree.RootId, null) as InternalNode;
Assert.IsNotNull(root);
Assert.AreEqual(1, root.KeyCount);
var leftChild = targetTree.GetNode(root.ChildPointers[0], null) as LeafNode;
var rightChild = targetTree.GetNode(root.ChildPointers[1], null) as LeafNode;
Assert.IsNotNull(leftChild);
Assert.IsNotNull(rightChild);
Assert.AreEqual(config.LeafLoadFactor+1, leftChild.KeyCount + rightChild.KeyCount);
// Key count in each node should be >= split index
Assert.IsTrue(leftChild.KeyCount > config.LeafSplitIndex, "Left child has too few keys");
Assert.IsTrue(rightChild.KeyCount > config.LeafSplitIndex, "Right child has too few keys");
// And neither
}
}
