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Posted to user@accumulo.apache.org by David Medinets <da...@gmail.com> on 2013/05/28 18:50:41 UTC

Clarification of 'Scan (Entries/s)' Meaning on Monitor Page

Does this metric track entries returned to the client (as the 'Query'
column on the Master Server page does)? If the scan tracks returned
entries, is there a metric that tracks entries scanned on the server?

Re: Clarification of 'Scan (Entries/s)' Meaning on Monitor Page

Posted by Josh Elser <jo...@gmail.com>.

I believe "Scan" is for number of key-value pairs examined (what you 
were asking in your 2nd question), and "Query" is number of key-value 
pairs returned by a scan session (iterator stack).

I believe it would be accurate to say that Scan should always be greater 
than or equal to Query.

On 5/28/13 12:50 PM, David Medinets wrote:
> Does this metric track entries returned to the client (as the 'Query'
> column on the Master Server page does)? If the scan tracks returned
> entries, is there a metric that tracks entries scanned on the server?