Re: Read Perf

2013-02-26 Thread Hiller, Dean
-- >From: Hiller, Dean [mailto:dean.hil...@nrel.gov] >Sent: 26 February 2013 09:32 >To: user@cassandra.apache.org >Subject: Re: Read Perf > >In that case, make sure you don't plan on going into the millions or test >the limit as I pretty sure it can't go above 10 million. (from p

RE: Read Perf

2013-02-26 Thread Kanwar Sangha
Yep. So the read will remain constant in this case ? -Original Message- From: Hiller, Dean [mailto:dean.hil...@nrel.gov] Sent: 26 February 2013 09:32 To: user@cassandra.apache.org Subject: Re: Read Perf In that case, make sure you don't plan on going into the millions or tes

Re: Read Perf

2013-02-26 Thread Hiller, Dean
be the same. The >only thing which changes is the columns and they keep getting added. > >-Original Message- >From: Hiller, Dean [mailto:dean.hil...@nrel.gov] >Sent: 26 February 2013 09:21 >To: user@cassandra.apache.org >Subject: Re: Read Perf > >To find stuf

RE: Read Perf

2013-02-26 Thread Kanwar Sangha
Thanks. For our case, the no of rows will more or less be the same. The only thing which changes is the columns and they keep getting added. -Original Message- From: Hiller, Dean [mailto:dean.hil...@nrel.gov] Sent: 26 February 2013 09:21 To: user@cassandra.apache.org Subject: Re: Read

Re: Read Perf

2013-02-26 Thread Hiller, Dean
To find stuff on disk, there is a bloomfilter for each file in memory. On the docs, 1 billion rows has 2Gig of RAM, so it really will have a huge dependency on your number of rows. As you get more rows, you may need to modify the bloomfilter false positive to use less RAM but that means slower

RE: Read perf investigation

2011-11-03 Thread Dan Hendry
Uh, so look at your await time of *107.3*. From the iostat man page: "await: The average time (in milliseconds) for I/O requests issued to the device to be served. This includes the time spent by the requests in queue and the time spent servicing them." If the key you are reading from is not