thanks , that is helpful S.
----- Original Message ---- From: Jonathan Ellis <jbel...@gmail.com> To: user@cassandra.apache.org Sent: Fri, April 9, 2010 11:39:26 AM Subject: Re: Worst case #iops to read a row worst case is 2 or 3, depending on row size: one seek to read the right row index block one seek to read the row header (bloom filter + column index) if it's a big row, one seek to read the column block (block size is configurable, default is 256KB) On Thu, Apr 8, 2010 at 5:21 PM, Scott Shealy <spshe...@yahoo.com> wrote: > Not knowing know anything about the physical layout of the data on disk or > how it is accessed when it is read... Could someone who does help > estimate the worst case scenario(no caching at any level) for the number of > iops to read a row of modest size and modest number of columns in a > large column family. > > TIA, > > S. > >
