public void FasterLogTest6([Values] LogChecksumType logChecksum)
{
log = new FasterLog(new FasterLogSettings {
LogDevice = device, MemorySizeBits = 20, PageSizeBits = 14, LogChecksum = logChecksum, LogCommitManager = manager
});
byte[] data1 = new byte[1000];
for (int i = 0; i < 100; i++)
{
data1[i] = (byte)i;
}
for (int i = 0; i < 100; i++)
{
log.Enqueue(data1);
}
log.RefreshUncommitted();
Assert.IsTrue(log.SafeTailAddress == log.TailAddress);
Assert.IsTrue(log.CommittedUntilAddress < log.SafeTailAddress);
using (var iter = log.Scan(0, long.MaxValue, scanUncommitted: true))
{
while (iter.GetNext(out _, out _, out _))
{
log.TruncateUntil(iter.NextAddress);
}
Assert.IsTrue(iter.NextAddress == log.SafeTailAddress);
log.Enqueue(data1);
Assert.IsFalse(iter.GetNext(out _, out _, out _));
log.RefreshUncommitted();
Assert.IsTrue(iter.GetNext(out _, out _, out _));
}
log.Dispose();
}
private void FasterLogTest1(LogChecksumType logChecksum, IDevice device, ILogCommitManager logCommitManager)
{
log = new FasterLog(new FasterLogSettings {
PageSizeBits = 20, SegmentSizeBits = 20, LogDevice = device, LogChecksum = logChecksum, LogCommitManager = logCommitManager
});
byte[] entry = new byte[entryLength];
for (int i = 0; i < entryLength; i++)
{
entry[i] = (byte)i;
}
for (int i = 0; i < numEntries; i++)
{
log.Enqueue(entry);
}
log.Commit(true);
using (var iter = log.Scan(0, long.MaxValue))
{
int count = 0;
while (iter.GetNext(out byte[] result, out int length, out long currentAddress))
{
count++;
Assert.IsTrue(result.SequenceEqual(entry));
if (count % 100 == 0)
{
log.TruncateUntil(iter.NextAddress);
}
}
Assert.IsTrue(count == numEntries);
}
log.Dispose();
}
public void FasterLogTest1([Values] LogChecksumType logChecksum)
{
log = new FasterLog(new FasterLogSettings {
LogDevice = device, LogChecksum = logChecksum
});
byte[] entry = new byte[entryLength];
for (int i = 0; i < entryLength; i++)
{
entry[i] = (byte)i;
}
for (int i = 0; i < numEntries; i++)
{
log.Enqueue(entry);
}
log.Commit(true);
using (var iter = log.Scan(0, long.MaxValue))
{
int count = 0;
while (iter.GetNext(out byte[] result, out int length))
{
count++;
Assert.IsTrue(result.SequenceEqual(entry));
if (count % 100 == 0)
{
log.TruncateUntil(iter.CurrentAddress);
}
}
Assert.IsTrue(count == numEntries);
}
log.Dispose();
}
static void ScanThread()
{
Random r = new Random();
byte[] result;
using (iter = log.Scan(log.BeginAddress, long.MaxValue))
{
while (true)
{
while (!iter.GetNext(out result, out int length))
{
// For finite end address, check if iteration ended
// if (iter.CurrentAddress >= endAddress) return;
iter.WaitAsync().GetAwaiter().GetResult();
}
// Memory pool variant:
// iter.GetNext(pool, out IMemoryOwner<byte> resultMem, out int length))
if (Different(result, staticEntry, out int location))
{
throw new Exception("Invalid entry found");
}
// Re-insert entry with small probability
if (r.Next(100) < 10)
{
log.Enqueue(result);
}
// Example of random read from given address
// (result, _) = log.ReadAsync(iter.CurrentAddress).GetAwaiter().GetResult();
// Truncate log until after recently processed entry
log.TruncateUntil(iter.NextAddress);
// Safer truncate variant: truncate until start of page
// log.TruncateUntilPageStart(iter.NextAddress);
}
}
// Example of recoverable (named) iterator:
// using (iter = log.Scan(log.BeginAddress, long.MaxValue, "foo"))
}
static async Task ConsumerAsync(FasterLog log, CancellationToken cancellationToken)
{
using var iter = log.Scan(log.BeginAddress, long.MaxValue, "foo", true, ScanBufferingMode.DoublePageBuffering, scanUncommitted: true);
int count = 0;
await foreach (var(result, length, currentAddress, nextAddress) in iter.GetAsyncEnumerable(cancellationToken))
{
Console.WriteLine($"Consuming {Encoding.UTF8.GetString(result)}");
iter.CompleteUntil(nextAddress);
log.TruncateUntil(nextAddress);
// We simulate temporary slow down of data consumption
// This will cause transient log spill to disk (observe folder on storage)
if (count++ > 1000 && count < 1200)
{
Thread.Sleep(100);
}
}
}
public async Task FasterLogTest4([Values] LogChecksumType logChecksum)
{
log = new FasterLog(new FasterLogSettings {
LogDevice = device, PageSizeBits = 14, LogChecksum = logChecksum
});
byte[] data1 = new byte[100];
for (int i = 0; i < 100; i++)
{
data1[i] = (byte)i;
}
for (int i = 0; i < 100; i++)
{
log.Enqueue(data1);
}
Assert.IsTrue(log.CommittedUntilAddress == log.BeginAddress);
await log.CommitAsync();
Assert.IsTrue(log.CommittedUntilAddress == log.TailAddress);
Assert.IsTrue(log.CommittedBeginAddress == log.BeginAddress);
using (var iter = log.Scan(0, long.MaxValue))
{
// Should read the "hole" and return false
var iterResult = iter.GetNext(out byte[] entry, out _, out _);
log.TruncateUntil(iter.NextAddress);
Assert.IsTrue(log.CommittedUntilAddress == log.TailAddress);
Assert.IsTrue(log.CommittedBeginAddress < log.BeginAddress);
Assert.IsTrue(iter.NextAddress == log.BeginAddress);
await log.CommitAsync();
Assert.IsTrue(log.CommittedUntilAddress == log.TailAddress);
Assert.IsTrue(log.CommittedBeginAddress == log.BeginAddress);
}
log.Dispose();
}
public void TruncateUntil(long address)
{
logger.TruncateUntil(address);
}