public async Task <long> GetLastDocId()
{
if (_file.Length == 0)
{
return(0);
}
var initialPos = _file.Position;
try
{
var compression = new CompressionUtils();
var segment = await compression.ReadWithDecompressionFromRightToLeft(_file);
using (var ms = new MemoryStream(segment.Array, segment.Offset, segment.Count))
{
var batch = await DocumentSerializer.DeserializeBatch(ms).ConfigureAwait(false);
return(batch.Last().Id);
}
}
finally
{
_file.Position = initialPos;
}
}
