Hello,
Iirc writing a new value to a row will invalidate the row cache for that value. Row cache is only populated after a read operation. http://www.datastax.com/documentation/cassandra/2.0/cassandra/operations/ops_configuring_caches_c.html?scroll=concept_ds_n35_nnr_ck Cassandra provides the ability to "preheat" key and page cache, but I don't believe this is possible for row cache. Hope that helps. Jonathan Jonathan Lacefield Solutions Architect, DataStax (404) 822 3487 <http://www.linkedin.com/in/jlacefield> <http://www.datastax.com/cassandrasummit14> On Mon, Apr 28, 2014 at 10:27 PM, Jimmy Lin <y2klyf+w...@gmail.com> wrote: > I am wondering if there is any negative impact on Cassandra write > operation, if I turn on row caching for a table that has mostly 'static > columns' but few frequently write columns (like timestamp). > > The application will frequently write to a few columns, and the > application will also frequently query entire row. > > How Cassandra handle update column to a cached row? > does it update both memtables value and also the row cached row's > column(which dealing with memory update so it is very fast) ? > or in order to update the cached row, entire row need to read back from > sstable? > > > thanks > >
