Hi All I’m thinking to do in this way.
1) 1) get_slice ( YYYYMMDDHH ) from Index Table. 2) 2) With the returned list of ROWKEYs 3) 3) Pass it to multiget_slice ( keys …) But my questions is how to ensure ‘Data Locality’ ?? On Tue, Mar 19, 2013 at 3:33 PM, aaron morton <aa...@thelastpickle.com>wrote: > I would be looking at Hive or Pig, rather than writing the MapReduce. > > There is an example in the source cassandra distribution, or you can look > at Data Stax Enterprise to start playing with Hive. > > Typically with hadoop queries you want to query a lot of data, if you are > only querying a few rows consider writing the code in your favourite > language. > > Cheers > > ----------------- > Aaron Morton > Freelance Cassandra Consultant > New Zealand > > @aaronmorton > http://www.thelastpickle.com > > On 18/03/2013, at 1:29 PM, Alicia Leong <lccali...@gmail.com> wrote: > > Hi All > > I have 2 tables > > Data Table > ----------------- > RowKey: 1 > => (column=name, value=apple) > RowKey: 2 > => (column=name, value=orange) > RowKey: 3 > => (column=name, value=banana) > RowKey: 4 > => (column=name, value=mango) > > > Index Table (YYYYMMDDHH) > ------------------------------------------------ > RowKey: 2013030114 > => (column=1, value=) > => (column=2, value=) > => (column=3, value=) > RowKey: 2013030115 > => (column=4, value=) > > > I would like to know, how to implement below in MapReduce > 1) first query the Index Table by RowKey: 2013030114 > 2) then pass the Index Table column names (1,2,3) to query the Data Table > > Thanks in advance. > > >
