Service defaults to top down reader mode by default

[Kaustubh-cribl]

Service defaults to top down reader mode by default and performs reversal in-memory, whereas expected behavior was to read in reverse to find latest lines in minimal time.

[wzdave]

Got it, I will take a look at my bottom up reader.

[Kaustubh-cribl]

In this case implementing bottom up reader was sufficient as requirement mentioned the following:

The lines returned must be presented with the newest log events rst. It is safe to
assume that log les will be written with newest events at the end of the file