Re: Monitoring bytes read per cf

2011-05-13 Thread Daniel Doubleday
Thanks - yes I agree. Didn't want to judge solely based on this figure. It should just add to the picture. But since we know access patterns and other stats like key and row cache hit ratios we hope to be able to make a more educated guess whats going on. On May 13, 2011, at 9:08 AM, Peter Sch

Re: Monitoring bytes read per cf

2011-05-13 Thread Peter Schuller
> It seems to work fine but maybe someone here knows that this is not a good > idea It depends. If you're trying to figure out what generates actual iops to disk, it won't really tell you since you're counting all I/O including that which is cached. Since whatever goes down to disk tends to

Monitoring bytes read per cf

2011-05-12 Thread Daniel Doubleday
Hi all got a question for folks with some code insight again. To be able to better understand where our IO load is coming from we want to monitor the number of bytes read from disc per cf. (we love stats) What I have done is wrapping the FileDataInput in SSTableReader to sum the bytes read in