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 TestInsertAndDeleteAllEntries()
{
var value = new byte[64];
ulong rootPageId;
const int keyCount = 20000;
using(var pageStore = TestUtils.CreateEmptyPageStore("TestInsertAndDeleteAllEntries.data"))
{
var tree = new BPlusTree(0, pageStore);
for(int i = 0; i < keyCount; i++)
{
tree.Insert(0, (ulong)i, value);
}
rootPageId = tree.Save(0, null);
pageStore.Commit(0, null);
}
using(var pageStore = TestUtils.OpenPageStore("TestInsertAndDeleteAllEntries.data", true))
{
var tree = new BPlusTree(pageStore, rootPageId);
for(int i = 0; i < keyCount; i++)
{
Assert.IsTrue(tree.Search((ulong)i, value, null), "Could not find key {0} after insert and save.");
}
}
using (var pageStore = TestUtils.OpenPageStore("TestInsertAndDeleteAllEntries.data", false))
{
var tree = new BPlusTree(pageStore, rootPageId);
Assert.IsTrue(tree.Search(3457ul, value, null), "Could not find entry 3457 before deletes");
for (int i = 0; i < keyCount; i += 2)
{
tree.Delete(1ul, (ulong)i, null);
Assert.IsFalse(tree.Search((ulong)i, value, null), "Still found entry for key {0} after delete", i);
Assert.IsTrue(tree.Search(3457ul, value, null), "Could not find entry 3457 after delete of {0}",i);
}
rootPageId = tree.Save(1, null);
pageStore.Commit(1, null);
}
using (var pageStore = TestUtils.OpenPageStore("TestInsertAndDeleteAllEntries.data", true))
{
var tree = new BPlusTree(pageStore, rootPageId);
for (int i = 1; i < keyCount; i += 2)
{
Assert.IsTrue(tree.Search((ulong)i, value, null), "Could not find key {0} after deletion of even numbered keys.", i);
Assert.IsFalse(tree.Search((ulong)i-1, value, null), "Found key {0} after deletion of even numbered keys", i-1);
}
}
using (var pageStore = TestUtils.OpenPageStore("TestInsertAndDeleteAllEntries.data", false))
{
var tree = new BPlusTree(pageStore, rootPageId);
for (int i = 1; i < keyCount; i += 2)
{
tree.Delete(2ul, (ulong)i, null);
Assert.IsFalse(tree.Search((ulong)i, value, null), "Key {0} was still found by a search after it was deleted", i);
}
rootPageId = tree.Save(2, null);
pageStore.Commit(2, null);
}
using (var pageStore = TestUtils.OpenPageStore("TestInsertAndDeleteAllEntries.data", true))
{
var tree = new BPlusTree(pageStore, rootPageId);
Console.WriteLine("After load\r\n");
tree.DumpStructure();
Assert.AreEqual(0, tree.Scan(null).Count(), "Expected an empty tree after deleting all odd-numbered entries");
}
}
public void TestValuelessBTree()
{
var insertedValues = new List<Guid>();
ulong treeRoot;
var txnId = 0ul;
using (var pageStore = TestUtils.CreateEmptyPageStore("TestValuelessBTree.data"))
{
var tree = new BPlusTree(0, pageStore, 16, 0);
for(int i = 0; i < 1000; i++)
{
var g = Guid.NewGuid();
tree.Insert(txnId, g.ToByteArray(), null);
insertedValues.Add(g);
}
tree.Save(0, null);
treeRoot = tree.RootId;
pageStore.Commit(0ul, null);
//tree.DumpStructure();
}
using (var pageStore = TestUtils.OpenPageStore("TestValuelessBTree.data", false))
{
var tree = new BPlusTree(pageStore, treeRoot, 16, 0);
tree.DumpStructure();
var buff = new byte[0];
foreach(var g in insertedValues)
{
Assert.IsTrue(tree.Search(g.ToByteArray(), buff, null));
}
}
}
public void TestMergeRight()
{
using (var pageStore = TestUtils.CreateEmptyPageStore("TestMergeRight.data"))
{
var txnId = 0ul;
var tree = new BPlusTree(txnId, pageStore);
var testBytes = new byte[] {1, 2, 3, 4};
var config = tree.Configuration;
var buff = new byte[config.ValueSize];
for (int i = 0; i < config.LeafLoadFactor*config.InternalBranchFactor; i++)
{
try
{
tree.Insert(txnId, (ulong) i, testBytes);
}
catch (Exception ex)
{
Assert.Fail("Insert failed for key {0} with exception {1}", i, ex);
}
}
var rootNode = tree.GetNode(tree.RootId, null);
var childId = (rootNode as IInternalNode).GetChildNodeId(rootNode.RightmostKey);
var child = tree.GetNode(childId, null) as IInternalNode;
var childLeftmostKey = BitConverter.ToUInt64(child.LeftmostKey, 0);
var grandchild =
tree.GetNode(child.GetChildNodeId(BitConverter.GetBytes(childLeftmostKey - 1)), null) as ILeafNode;
var deleteFrom = BitConverter.ToUInt64(grandchild.LeftmostKey, 0);
var findChildId = (rootNode as IInternalNode).GetChildNodeId(BitConverter.GetBytes(deleteFrom));
Assert.AreEqual(child.PageId, findChildId, "Incorrect node id returned for key {0}", deleteFrom);
tree.DumpStructure();
for (ulong i = 0; i < 4; i++)
{
var deleteKey = deleteFrom + i;
tree.Delete(txnId, deleteKey, null); // Should be enough to force a right merge
//Console.WriteLine("\n\nDeleted {0}\n", deleteKey);
//tree.DumpStructure();
Assert.IsTrue(tree.Search(10395ul, buff, null));
}
for (ulong i = 0; i < (ulong) (config.LeafLoadFactor*config.InternalBranchFactor); i++)
{
try
{
Assert.IsTrue(tree.Search(i, buff, null) ^ (i - deleteFrom >= 0 && i - deleteFrom < 4),
"Could not find key {0}. deleteFrom={1}", i, deleteFrom);
}
catch (AssertionException)
{
Console.WriteLine("\nFailed tree structure:\n");
tree.DumpStructure();
throw;
}
}
deleteFrom = (ulong) (config.LeafLoadFactor*config.InternalBranchFactor) - 5;
for (ulong i = 0; i < 4; i++)
{
var deleteKey = deleteFrom + i;
tree.Delete(txnId, deleteKey, null);
}
}
}
public void TestInsertInReverseOrder()
{
using (var pageStore = TestUtils.CreateEmptyPageStore("TestInsertInReverseOrder.data"))
{
var txnId = 0ul;
var tree = new BPlusTree(txnId, pageStore);
var config = tree.Configuration;
for (int i = 100000; i > 0; i--)
{
tree.Insert(txnId, (ulong) i, BitConverter.GetBytes(i));
}
Console.WriteLine("Tree after 100,000 inserts:");
tree.DumpStructure();
var buff = new byte[config.ValueSize];
for (int i = 100000; i > 0; i--)
{
Assert.IsTrue(tree.Search((ulong) i, buff, null), "Cannot find entry for key {0}", i);
TestUtils.AssertBuffersEqual(BitConverter.GetBytes(i), buff);
}
}
}
public void TestBatchedInserts()
{
var rng = new Random();
var keyBuff = new byte[8];
var value = new byte[64];
ulong key = 0;
var txnId = 0ul;
var inserted = new HashSet<ulong>();
inserted.Add(0); // Not using enumerable initializer because its not supported in the mobile build
using (var pageStore = TestUtils.CreateEmptyPageStore("TestBatchedInserts.data"))
{
var tree = new BPlusTree(pageStore);
for (int i = 1; i <= 10000; i++)
{
while (inserted.Contains(key))
{
rng.NextBytes(keyBuff);
key = BitConverter.ToUInt64(keyBuff, 0);
}
inserted.Add(key);
tree.Insert(txnId, key, value);
if (i%250 == 0)
{
tree.Save((ulong)i / 250, null);
pageStore.Commit((ulong)i / 250, null);
Assert.AreEqual(i, tree.Scan(0, ulong.MaxValue, null).Count());
Console.WriteLine("Dump tree @ commit after {0}", i);
tree.DumpStructure();
}
}
}
}
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
}
}