In one of our load tests, we're incrementing a single counter column as
well as appending columns to a single row (essentially a timeline). You can
think of it as counting the instances of an event and then keeping a
timeline of those events. The ratio is of increments to "appends" is 1:1.
When we
On Wed, Jul 3, 2013 at 9:59 AM, Andrew Bialecki
wrote:
> 2. I'm assuming in our case the cause is incrementing counters because
> disk reads are part of the write path for counters and are not for
> appending columns to a row. Does that logic make sense?
>
That's a pretty reasonable assumption if
Can someone remind me why replicate on write tasks might be related to the
high disk I/O? My understanding is the replicate on write involves sending
the update to other nodes, so it shouldn't involve any disk activity --
disk activity would be during the mutation/write phase.
The write path (not
> The write path (not replicate on write) for counters involves a read,
>
I'm afraid you got it wrong. The read done during counter writes *is* done
by the replicate on write taks. Though really, the replicate on write taks
are just one part of the counter write path (they are not "not the write
p
