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 path").


On Wed, Jul 3, 2013 at 1:03 PM, Robert Coli <> wrote:
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 you are not doing any other reads and you see your disk busy doing non-compaction related reads. :)