Re: Specifying row caching on per query basis ?
Jonathan, what if the data is really homogeneous, but over a long period of time. I decided that the users who hit the database for recent past should have a better ride. Splitting into a separate CF also has costs, right? In fact, if I were to go this way, do you think I can crank down the key caches? If yes, down to what level, zero? Thanks! Jonathan Ellis-3 wrote: > > Not really, no. If you can't trust LRU to cache the hottest rows > perhaps you should split the data into different ColumnFamilies. > > On Wed, Feb 9, 2011 at 1:43 PM, Ertio Lew wrote: >> Is this under consideration for future releases ? or being thought >> about!? >> >> >> >> On Thu, Feb 10, 2011 at 12:56 AM, Jonathan Ellis >> wrote: >>> Currently there is not. >>> >>> On Wed, Feb 9, 2011 at 12:04 PM, Ertio Lew wrote: >>>> Is there any way to specify on per query basis(like we specify the >>>> Consistency level), what rows be cached while you're reading them, >>>> from a row_cache enabled CF. I believe, this could lead to much more >>>> efficient use of the cache space!!( if you use same data for different >>>> features/ parts in your application which have different caching >>>> needs). >>>> >>> >>> >>> >>> -- >>> Jonathan Ellis >>> Project Chair, Apache Cassandra >>> co-founder of DataStax, the source for professional Cassandra support >>> http://www.datastax.com >>> >> > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of DataStax, the source for professional Cassandra support > http://www.datastax.com > > -- View this message in context: http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Specifying-row-caching-on-per-query-basis-tp6008838p6009462.html Sent from the cassandra-u...@incubator.apache.org mailing list archive at Nabble.com.
Re: Specifying row caching on per query basis ?
On Wed, Feb 9, 2011 at 2:43 PM, Ertio Lew wrote: > Is this under consideration for future releases ? or being thought about!? > > > > On Thu, Feb 10, 2011 at 12:56 AM, Jonathan Ellis wrote: >> Currently there is not. >> >> On Wed, Feb 9, 2011 at 12:04 PM, Ertio Lew wrote: >>> Is there any way to specify on per query basis(like we specify the >>> Consistency level), what rows be cached while you're reading them, >>> from a row_cache enabled CF. I believe, this could lead to much more >>> efficient use of the cache space!!( if you use same data for different >>> features/ parts in your application which have different caching >>> needs). >>> >> >> >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of DataStax, the source for professional Cassandra support >> http://www.datastax.com >> > I have mentioned a suggested implemented inside this issue. https://issues.apache.org/jira/browse/CASSANDRA-2035
Re: Specifying row caching on per query basis ?
Not really, no. If you can't trust LRU to cache the hottest rows perhaps you should split the data into different ColumnFamilies. On Wed, Feb 9, 2011 at 1:43 PM, Ertio Lew wrote: > Is this under consideration for future releases ? or being thought about!? > > > > On Thu, Feb 10, 2011 at 12:56 AM, Jonathan Ellis wrote: >> Currently there is not. >> >> On Wed, Feb 9, 2011 at 12:04 PM, Ertio Lew wrote: >>> Is there any way to specify on per query basis(like we specify the >>> Consistency level), what rows be cached while you're reading them, >>> from a row_cache enabled CF. I believe, this could lead to much more >>> efficient use of the cache space!!( if you use same data for different >>> features/ parts in your application which have different caching >>> needs). >>> >> >> >> >> -- >> Jonathan Ellis >> Project Chair, Apache Cassandra >> co-founder of DataStax, the source for professional Cassandra support >> http://www.datastax.com >> > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
Re: Specifying row caching on per query basis ?
Is this under consideration for future releases ? or being thought about!? On Thu, Feb 10, 2011 at 12:56 AM, Jonathan Ellis wrote: > Currently there is not. > > On Wed, Feb 9, 2011 at 12:04 PM, Ertio Lew wrote: >> Is there any way to specify on per query basis(like we specify the >> Consistency level), what rows be cached while you're reading them, >> from a row_cache enabled CF. I believe, this could lead to much more >> efficient use of the cache space!!( if you use same data for different >> features/ parts in your application which have different caching >> needs). >> > > > > -- > Jonathan Ellis > Project Chair, Apache Cassandra > co-founder of DataStax, the source for professional Cassandra support > http://www.datastax.com >
Re: Specifying row caching on per query basis ?
Currently there is not. On Wed, Feb 9, 2011 at 12:04 PM, Ertio Lew wrote: > Is there any way to specify on per query basis(like we specify the > Consistency level), what rows be cached while you're reading them, > from a row_cache enabled CF. I believe, this could lead to much more > efficient use of the cache space!!( if you use same data for different > features/ parts in your application which have different caching > needs). > -- Jonathan Ellis Project Chair, Apache Cassandra co-founder of DataStax, the source for professional Cassandra support http://www.datastax.com
Specifying row caching on per query basis ?
Is there any way to specify on per query basis(like we specify the Consistency level), what rows be cached while you're reading them, from a row_cache enabled CF. I believe, this could lead to much more efficient use of the cache space!!( if you use same data for different features/ parts in your application which have different caching needs).
