private static DateTime GetLastLiveTimestamp(DocumentsOperationContext context, TimeSeriesValuesSegment segment, DateTime baseline)
{
return(segment.NumberOfEntries == segment.NumberOfLiveEntries
? segment.GetLastTimestamp(baseline) // all values are alive, so we can get the last value fast
: segment.YieldAllValues(context, baseline, includeDead: false).Last().Timestamp);
}
public long UpdateStats(DocumentsOperationContext context, TimeSeriesSliceHolder slicer, CollectionName collection, TimeSeriesValuesSegment segment, DateTime baseline, int modifiedEntries)
{
long previousCount;
DateTime start, end;
context.DocumentDatabase.Metrics.TimeSeries.PutsPerSec.MarkSingleThreaded(modifiedEntries);
context.DocumentDatabase.Metrics.TimeSeries.BytesPutsPerSec.MarkSingleThreaded(segment.NumberOfBytes);
var table = GetOrCreateTable(context.Transaction.InnerTransaction, collection);
using (ReadStats(context, table, slicer, out previousCount, out start, out end, out var name))
{
var liveEntries = segment.NumberOfLiveEntries;
if (liveEntries > 0)
{
HandleLiveSegment();
}
if (liveEntries == 0)
{
if (TryHandleDeadSegment() == false)
{
// this ts was completely deleted
start = end = default;
}
}
var count = previousCount + liveEntries;
using (table.Allocate(out var tvb))
{
tvb.Add(slicer.StatsKey);
tvb.Add(GetPolicy(slicer));
tvb.Add(Bits.SwapBytes(start.Ticks));
tvb.Add(end);
tvb.Add(count);
tvb.Add(name);
table.Set(tvb);
}
return(count);
}
void HandleLiveSegment()
{
if (segment.NumberOfEntries == 1 && start > end)
{
// new series
start = end = baseline;
return;
}
var lastTimestamp = GetLastLiveTimestamp(context, segment, baseline);
if (lastTimestamp > end)
{
end = lastTimestamp; // found later end
}
else
{
var reader = _timeSeriesStorage.GetReader(context, slicer.DocId, slicer.Name, start, DateTime.MaxValue);
var last = reader.Last();
var lastValueInCurrentSegment = reader.ReadBaselineAsDateTime() == baseline;
end = lastValueInCurrentSegment ? lastTimestamp : last.Timestamp;
}
var first = segment.YieldAllValues(context, baseline, includeDead: false).First().Timestamp;
if (first < start)
{
start = first; // found earlier start
}
if (baseline <= start && first >= start)
{
// start was removed
start = first;
}
}
bool TryHandleDeadSegment()
{
if (previousCount == 0)
{
return(false); // if current and previous are zero it means that this time-series was completely deleted
}
var readerOfFirstValue = _timeSeriesStorage.GetReader(context, slicer.DocId, slicer.Name, DateTime.MinValue, DateTime.MaxValue);
readerOfFirstValue.First();
var firstValueInCurrentSegment = readerOfFirstValue.ReadBaselineAsDateTime() == baseline;
var last = segment.GetLastTimestamp(baseline);
if (baseline <= start && last >= start || firstValueInCurrentSegment)
{
// start was removed, need to find the next start
// this segment isn't relevant, so let's get the next one
var next = _timeSeriesStorage.GetReader(context, slicer.DocId, slicer.Name, start, DateTime.MaxValue).NextSegmentBaseline();
var reader = _timeSeriesStorage.GetReader(context, slicer.DocId, slicer.Name, next, DateTime.MaxValue);
var first = reader.First();
if (first == default)
{
return(false);
}
start = first.Timestamp;
}
var readerOfLastValue = _timeSeriesStorage.GetReader(context, slicer.DocId, slicer.Name, start, DateTime.MaxValue);
readerOfLastValue.Last();
var lastValueInCurrentSegment = readerOfLastValue.ReadBaselineAsDateTime() == baseline;
if (baseline <= end && end <= last || lastValueInCurrentSegment)
{
var lastEntry = _timeSeriesStorage.GetReader(context, slicer.DocId, slicer.Name, start, baseline.AddMilliseconds(-1)).Last();
if (lastEntry == default)
{
return(false);
}
end = lastEntry.Timestamp;
}
return(true);
}
}