[Gluster-devel] Gluster internals
ian.latter at midnightcode.org
Tue May 22 07:18:08 UTC 2012
> > But they include an assumption.
> > The query is: are async writes and reads sequential? The
> > two specific cases are;
> > 1) Are all reads that are initiated in time after a write
> > guaranteed to occur after that write has taken affect?
> > 2) Are all writes that are initiated in time after a write (x)
> > guaranteed to occur after that write (x) has taken
> > affect?
> Only overlapping offsets/regions retain causal ordering of completion. It
> is write-behind which acknowledges writes pre-maturely and therefore the
> layer which must maintain the 'effects' for further reads and writes by
> making the dependent IOs (overlapping offset/regions) wait for previous
> write's actual completion.
Ok, that should do the trick.
Let me mull over this for a while .. Thanks for that info.
Late night coder ..
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