If the amount of remaining time for compaction keeps going up, does this point to an overloaded node or an un-tuned node?


On Thu, May 30, 2013 at 3:10 PM, Robert Coli <rcoli@eventbrite.com> wrote:
On Wed, May 29, 2013 at 2:38 PM, Darren Smythe <darren1482@gmail.com> wrote:
> Were using the latest JNA and separate ephemeral drives for commit log and
> data directories.

(as a note..)

Per nickmbailey, testing shows that there is little/no benefit to
separating commit log and data dirs on virtualized disk (or SSD),
because the win from this practice comes when the head doesn't move
between appends to the commit log. Because   the head must be assumed
to always be moving on shared disk (and because there is no head to
move on SSD), you'd be better off with a one-disk-larger ephemeral
stripe for both data and commit log.

=Rob