It doesn't read the entire row, but it does read a section of the row from disk...
How big is each supercolumn? If you re-read the data does the query time get faster? On Tue, Jul 26, 2011 at 11:59 AM, Philippe <watche...@gmail.com> wrote: > i believe it's because it needs to read the whole row to get to your super > column. > > you might have to reconsider your model. > Le 26 juil. 2011 17:39, "Priyanka" <priya...@gmail.com> a écrit : > > > > > Hello All, > > > > I am doing some read tests on Cassandra on a single node.But they > > are turning up to be very slow. > > Here is the data model in detail. > > I am using a super column family.Cassandra has total 970 rows and each > row > > has 620901 super columns and each super column has 2 columns.Total data > in > > the database would be around 45GB. > > I am trying to retrieve the data of a particular super column[Trying to > pull > > the row key associated with the super column and the column values with > in > > the super column. > > It is taking 2.5 secs with java code and 4.7 secs with the python code. > > > > Here is the python code. > > result = col_fam.get_range(start="", > > finish="",columns=None,column_start="",column_finish > > > ="",column_reversed=False,column_count=2,row_count=None,include_timestamp=False, > > super_column='200003', read_consistency_level=None,buffer_size=None) > > > > This is very slow compared to MySQL. > > Am not sure whats going wrong here.Could some one let me know if there is > > any problem with my model. > > > > > > Any help in this regard is highly appreciated. > > > > Thank you. > > > > Regards, > > Priyanka > > > > > > > > > > > > -- > > View this message in context: > http://cassandra-user-incubator-apache-org.3065146.n2.nabble.com/Slow-Reads-tp6622680p6622680.html > > Sent from the cassandra-u...@incubator.apache.org mailing list archive > at Nabble.com. > -- http://twitter.com/tjake
