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From <>
Subject RE: Secondary Indexes
Date Sun, 17 Mar 2013 09:17:19 GMT
I do not think this is a good use case for Cassandra alone, assuming the queries can be any
combination of the 18 columns.
I would consider using some combination of Cassandra and Solr, where Solr provides the indexing/search,
and Cassandra provides the bulk store.

From: Andy Stec []
Sent: Saturday, March 16, 2013 12:10 AM
Subject: Secondary Indexes

We need to provide search capability based on a field that is a bitmap
combination of 18 possible values. We want to use secondary indexes to
improve performance. One possible solution is to create a named column for
each value and have a secondary index for each of the 18 columns.
Questions we have are:

- Will that result in Cassandra creating 18 new column families,
one for each index?

- If a given column is not specified in any rows, will Cassandra
still create an index column family?

- The documentation says that indexes are rebuilt with every
Cassandra restart. Why is that needed? What does the rebuild do? Does it
read the whole column family into memory at once?


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