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Posted to user@cassandra.apache.org by Or Sher <or...@gmail.com> on 2014/07/07 08:08:42 UTC

Cassandra coordinator metrics

Hi,

I found that 2.0.9 exposes "CoordinatorReadLatency" and
"CoordinatorScanLatency" on a column family resolution.
1. What exactly does the CoordinatorScanLatency means?
2. Is there a write equivalent metric?

-- 
Or Sher

Re: Cassandra coordinator metrics

Posted by Or Sher <or...@gmail.com>.

1. Thanks, make sense.
2. Is there a special reason for that? Is it somewhere in the road map?


On Thu, Jul 17, 2014 at 2:45 AM, Tyler Hobbs <ty...@datastax.com> wrote:

>
> On Mon, Jul 7, 2014 at 1:08 AM, Or Sher <or...@gmail.com> wrote:
>
>> 1. What exactly does the CoordinatorScanLatency means?
>>
>
> It's the latency for table scans, like "select * from mytable".  The
> normal read latency only covers reads within a partition.
>
>
>> 2. Is there a write equivalent metric?
>>
>
> No.
>
>
> --
> Tyler Hobbs
> DataStax <http://datastax.com/>
>



-- 
Or Sher

Re: Cassandra coordinator metrics

Posted by Tyler Hobbs <ty...@datastax.com>.

On Mon, Jul 7, 2014 at 1:08 AM, Or Sher <or...@gmail.com> wrote:

> 1. What exactly does the CoordinatorScanLatency means?
>

It's the latency for table scans, like "select * from mytable".  The normal
read latency only covers reads within a partition.

> 2. Is there a write equivalent metric?
>

No.

-- 
Tyler Hobbs
DataStax <http://datastax.com/>