public async Task Test_Can_Save_And_Reload_Snapshot()
{
const string FILE_PATH = ".\\test.pndb";
const int N = 1 * 1000 * 1000;
if (File.Exists(FILE_PATH))
{
File.Delete(FILE_PATH);
}
// insert N sequential items and bulk load with "ordered = true" to skip the sorting of levels
Console.WriteLine("Generating " + N.ToString("N0") + " keys...");
var data = new KeyValuePair <Slice, Slice> [N];
var rnd = new Random();
for (int i = 0; i < N; i++)
{
data[i] = new KeyValuePair <Slice, Slice>(
Slice.FromAscii(i.ToString("D16")),
Slice.Random(rnd, 50)
);
}
var sw = new Stopwatch();
using (var db = MemoryDatabase.CreateNew())
{
Console.Write("Inserting ...");
sw.Restart();
await db.BulkLoadAsync(data, ordered : true);
sw.Stop();
Console.WriteLine(" done in " + sw.Elapsed.TotalSeconds.ToString("N1") + " secs");
db.Debug_Dump();
Console.Write("Saving...");
sw.Restart();
await db.SaveSnapshotAsync(FILE_PATH, null, this.Cancellation);
sw.Stop();
Console.WriteLine(" done in " + sw.Elapsed.TotalSeconds.ToString("N1") + " secs");
}
var fi = new FileInfo(FILE_PATH);
Assert.That(fi.Exists, Is.True, "Snapshot file not found");
Console.WriteLine("File size is " + fi.Length.ToString("N0") + " bytes (" + (fi.Length * 1.0d / N).ToString("N2") + " bytes/item, " + (fi.Length / (1048576.0 * sw.Elapsed.TotalSeconds)).ToString("N3") + " MB/sec)");
Console.Write("Loading...");
sw.Restart();
using (var db = await MemoryDatabase.LoadFromAsync(FILE_PATH, this.Cancellation))
{
sw.Stop();
Console.WriteLine(" done in " + sw.Elapsed.TotalSeconds.ToString("N1") + " secs (" + (fi.Length / (1048576.0 * sw.Elapsed.TotalSeconds)).ToString("N0") + " MB/sec)");
db.Debug_Dump();
Console.WriteLine("Checking data integrity...");
sw.Restart();
long n = 0;
foreach (var batch in data.Buffered(50 * 1000))
{
using (var tx = db.BeginReadOnlyTransaction(this.Cancellation))
{
var res = await tx
.Snapshot
.GetRange(
FdbKeySelector.FirstGreaterOrEqual(batch[0].Key),
FdbKeySelector.FirstGreaterThan(batch[batch.Count - 1].Key))
.ToListAsync()
.ConfigureAwait(false);
Assert.That(res.Count, Is.EqualTo(batch.Count), "Some keys are missing from {0} to {1} :(", batch[0], batch[batch.Count - 1]);
for (int i = 0; i < res.Count; i++)
{
// note: Is.EqualTo(...) is slow on Slices so we speed things a bit
if (res[i].Key != batch[i].Key)
{
Assert.That(res[i].Key, Is.EqualTo(batch[i].Key), "Key is different :(");
}
if (res[i].Value != batch[i].Value)
{
Assert.That(res[i].Value, Is.EqualTo(batch[i].Value), "Value is different for key {0} :(", batch[i].Key);
}
}
}
n += batch.Count;
Console.Write("\r" + n.ToString("N0"));
}
sw.Stop();
Console.WriteLine(" done in " + sw.Elapsed.TotalSeconds.ToString("N1") + " secs");
}
Console.WriteLine("Content of database are identical ^_^");
}