On Wed, May 13, 2015 at 4:37 AM, Peer, Oded <oded.p...@rsa.com> wrote:

>  The cost of issuing an UPDATE that won’t update anything is compaction
> overhead. Since you stated it’s rare for rows to be updated then the
> overhead should be negligible.
>

It's also the cost of seeking into tables which contain the row fragment.

UPDATE with identical timestamp is generally speaking an anti-pattern in
log structured immutable storage; only acceptable if done very rarely...
probably not if done every hour.

=Rob

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