[CASSANDRA-2245] Enable map reduce to use indexes for ColumnFamilyInputFormat

• Type: Improvement
• Status: Resolved
• Priority: Low
• Resolution: Duplicate
• Fix Version/s: 0.8 beta 1
• Labels: hadoop

Environment

Cassandra 0.7 or later and Hadoop 0.20.1 or later

• Assignee: Unassigned
• Reporter: Matt Kennedy
• Created: 25/Feb/11 00:37
• Updated: 16/Apr/19 09:33
• Resolved: 18/Mar/11 13:50

Description

Enable the ability to run a MapReduce job that takes a value in an indexed column as a parameter, and use that to select the data that the MapReduce job operates on. Right now, it looks like this isn't possible because org.apache.cassandra.hadoop.ColumnFamilyRecordReader will only fetch data with get_range_slices, not get_indexed_slices.

Issue Links

• blocks: CASSANDRA-2246 Enable Pig to use indexed data as described in CASSANDRA-2245
• duplicates: CASSANDRA-2878 Allow map/reduce to use server-side query filters
• duplicates: CASSANDRA-1125 Filter out ColumnFamily rows that aren't part of the query (using a KeyRange)