void IHandle <SystemMessage.WaitForChaserToCatchUp> .Handle(SystemMessage.WaitForChaserToCatchUp message)
{
// if we are in states, that doesn't need to wait for chaser, ignore
if (_vnodeState != VNodeState.PreMaster && _vnodeState != VNodeState.PreReplica)
{
throw new Exception(string.Format("{0} appeared in {1} state.", message.GetType().Name, _vnodeState));
}
if (Writer.Checkpoint.Read() != Writer.Checkpoint.ReadNonFlushed())
{
Writer.Flush();
}
var sw = Stopwatch.StartNew();
while (Db.Config.ChaserCheckpoint.Read() < Db.Config.WriterCheckpoint.Read() &&
sw.Elapsed < WaitForChaserSingleIterationTimeout)
{
Thread.Sleep(1);
}
if (Db.Config.ChaserCheckpoint.Read() == Db.Config.WriterCheckpoint.Read())
{
Bus.Publish(new SystemMessage.ChaserCaughtUp(message.CorrelationId));
return;
}
var totalTime = message.TotalTimeWasted + sw.Elapsed;
if (totalTime < TimeSpan.FromSeconds(5) || (int)totalTime.TotalSeconds % 30 == 0) // too verbose otherwise
{
Log.Debug("Still waiting for chaser to catch up already for {0}...", totalTime);
}
Bus.Publish(new SystemMessage.WaitForChaserToCatchUp(message.CorrelationId, totalTime));
}
public void try_read_does_not_cache_anything_and_returns_record_once_it_is_written_later()
{
var writerchk = new InMemoryCheckpoint(0);
var chaserchk = new InMemoryCheckpoint(0);
var db = new TFChunkDb(TFChunkHelper.CreateDbConfig(PathName, writerchk, chaserchk));
db.Open();
var writer = new TFChunkWriter(db);
writer.Open();
var reader = new TFChunkReader(db, writerchk, 0);
Assert.IsFalse(reader.TryReadNext().Success);
var rec = LogRecord.SingleWrite(0, Guid.NewGuid(), Guid.NewGuid(), "ES", -1, "ET", new byte[] { 7 }, null);
long tmp;
Assert.IsTrue(writer.Write(rec, out tmp));
writer.Flush();
writer.Close();
var res = reader.TryReadNext();
Assert.IsTrue(res.Success);
Assert.AreEqual(rec, res.LogRecord);
db.Close();
}
public void try_read_does_not_cache_anything_and_returns_record_once_it_is_written_later()
{
var writerchk = new InMemoryCheckpoint(0);
var db = new TFChunkDb(new TFChunkDbConfig(PathName,
new VersionedPatternFileNamingStrategy(PathName, "chunk-"),
10000,
0,
writerchk,
new InMemoryCheckpoint()));
db.OpenVerifyAndClean();
var writer = new TFChunkWriter(db);
writer.Open();
var reader = new TFChunkSequentialReader(db, writerchk, 0);
LogRecord record;
Assert.IsFalse(reader.TryReadNext(out record));
var rec = LogRecord.SingleWrite(0, Guid.NewGuid(), Guid.NewGuid(), "ES", -1, "ET", new byte[] { 7 }, null);
long tmp;
Assert.IsTrue(writer.Write(rec, out tmp));
writer.Flush();
writer.Close();
Assert.IsTrue(reader.TryReadNext(out record));
Assert.AreEqual(rec, record);
reader.Close();
db.Close();
}
private EpochRecord WriteEpoch(int epochNumber, long lastPos, Guid instanceId)
{
long pos = _writer.Checkpoint.ReadNonFlushed();
var epoch = new EpochRecord(pos, epochNumber, Guid.NewGuid(), lastPos, DateTime.UtcNow, instanceId);
var rec = _logFormat.RecordFactory.CreateEpoch(epoch);
_writer.Write(rec, out _);
_writer.Flush();
return(epoch);
}
private EpochRecord WriteEpoch(int epochNumber, long lastPos, Guid instanceId)
{
long pos = _writer.Checkpoint.ReadNonFlushed();
var epoch = new EpochRecord(pos, epochNumber, Guid.NewGuid(), lastPos, DateTime.UtcNow, instanceId);
var rec = new SystemLogRecord(epoch.EpochPosition, epoch.TimeStamp, SystemRecordType.Epoch,
SystemRecordSerialization.Json, epoch.AsSerialized());
_writer.Write(rec, out _);
_writer.Flush();
return(epoch);
}
protected bool Flush(bool force = false)
{
var start = _watch.ElapsedTicks;
if (force || FlushMessagesInQueue == 0 || start - _lastFlushTimestamp >= _lastFlushDelay + _minFlushDelay)
{
var flushSize = Writer.Checkpoint.ReadNonFlushed() - Writer.Checkpoint.Read();
Writer.Flush();
var end = _watch.ElapsedTicks;
var flushDelay = end - start;
Interlocked.Exchange(ref _lastFlushDelay, flushDelay);
Interlocked.Exchange(ref _lastFlushSize, flushSize);
_lastFlushTimestamp = end;
if (_statCount >= LastStatsCount)
{
Interlocked.Add(ref _sumFlushSize, -_lastFlushSizes[_statIndex]);
Interlocked.Add(ref _sumFlushDelay, -_lastFlushDelays[_statIndex]);
}
else
{
_statCount += 1;
}
_lastFlushSizes[_statIndex] = flushSize;
_lastFlushDelays[_statIndex] = flushDelay;
Interlocked.Add(ref _sumFlushSize, flushSize);
Interlocked.Add(ref _sumFlushDelay, flushDelay);
Interlocked.Exchange(ref _maxFlushSize, Math.Max(Interlocked.Read(ref _maxFlushSize), flushSize));
Interlocked.Exchange(ref _maxFlushDelay, Math.Max(Interlocked.Read(ref _maxFlushDelay), flushDelay));
_statIndex = (_statIndex + 1) & (LastStatsCount - 1);
return(true);
}
return(false);
}
