tdf#109097 - mdds accelerating random lookups

[Kohei Yoshida]

On Sat, 2017-08-26 at 09:39 -0400, Kohei Yoshida wrote:
> One good news is that, this position update
> can potentially can concurrently if necessary since such operation
> only
> modifies the size of one block at any given moment, and the delta
> size
> can be applied to all the subsequent blocks independently.

One minor correction.  Such operation can modify more than one blocks
during deletion if the deletion range spans across multiple blocks. But
the core of my argument (about concurrency potential) still stands.