And it's slow, because Cassandra will read all data from SSTABLE from hard-disk to memory to filter. Secondary Indexes. Secondary index group API. It makes sense to also support filtering on clustering-columns. While Apache Cassandra also supports queries on non-partition key columns using ALLOW FILTERING, that’s very inefficient (requiring scanning the entire table) and currently not supported by Scylla (see issue #2200 for details). However, to solve the inverse query—given an email, fetch the user ID—requires a secondary index. Secondary index can locate data within a single node by its non-primary-key columns. allow indexes on the same table to receive centralized lifecycle events called secondary index groups. So here's the thing: Cassandra is very good at querying data by a specific key. Cassandra API supports secondary indexes on all data types except frozen collection types, decimal and variant types. ... at elaborating the problem that comes with Cassandra’s secondary indexes. Cassandra will filter down the resulSet using the other indices (if there are multiple indices in the query).The estimate returned rows for a native secondary index is equal to the estimate of number of CQL rows in the index table (estimate_rows) because each CQL row in the index table points to a single primary key of the base table. Use Cassandra secondary index very carefully. The primary index would be the user ID, so if you wanted to access a particular user’s email, you could look them up by their ID. It’s simply unfit for this purpose, and it even tries to tell you that by making you explicitly ALLOW FILTERING in the CQL query where a match by a Secondary index is needed. You can use execute queries that use a secondary index without ALLOW FILTERING – more on that later. SAI uses an extension of the Cassandra secondary index API to. Right now the table only has about 320k records and I can use ALLOW FILTERING with no problem, but I realize this might not always be the case. Azure Cosmos DB is a resource governed system. It is also good at retrieving a range of data within a partition. "SELECT * FROM {}. [Cassandra-commits] [jira] [Created] (CASSANDRA-11310) Allow filtering on clustering columns for queries without secondary indexes Benjamin Lerer (JIRA) Mar 7, 2016 at 9:30 am Secondary Index. Currently, Allow Filtering only works for secondary Index column or clustering columns. For implementation details on how to build a secondary index, the old Cassandra documentation is great. Secondary Indexes are designed to allow efficient querying of non-partition key columns. Since CASSANDRA-6377 queries without index filtering non-primary key columns are fully supported. 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