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POCompound Indexes in Apache Cassandra
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  1. POCompound Indexes in Apache Cassandra
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    copied!<p>I am trying to set up a cassandra column family with secondary indexes on a few columns I will need to filter by when reading data back out. In my initial testing, when I use multiple indexes together, things slow down. Here is how I have it configured currently (via cassandra-cli):</p> <pre><code>update column family bulkdata with comparator=UTF8Type and column_metadata=[{column_name: test_field, validation_class: UTF8Type}, {column_name: create_date, validation_class: LongType, index_type: KEYS}, {column_name: domain, validation_class: UTF8Type, index_type: KEYS}]; </code></pre> <p>I want to get all data where create_date > somevalue1 and column_name = somevalue2. Using pycassa for my client I do the following:</p> <pre><code> domain_expr = create_index_expression('domain', 'whatever.com') cd_expr = create_index_expression('create_date', 1293650000, GT) clause = create_index_clause([domain_expr, cd_expr], count=10000) for key, item in col_fam.get_indexed_slices(clause): ... </code></pre> <p>This is a common mistake in SQL of course, where one would normally have to create a compound index, based on the query needs. I'm quite new to cassandra though, so I don't know if such a thing is required or even exists.</p> <p>My interactions with cassandra will include large numbers of writes, and large numbers of reads and updates. I have set up the indexes figuring they were the right thing to do here, but perhaps I am completely wrong. I'd be interested in any ideas for setting up a performant system, with my index setup or without.</p> <p>oh, and this is on cassandra 0.7.0-rc3</p>
 

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