Secondary Index. 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. And it's slow, because Cassandra will read all data from SSTABLE from hard-disk to memory to filter. allow indexes on the same table to receive centralized lifecycle events called secondary index groups. [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 It makes sense to also support filtering on clustering-columns. 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. "SELECT * FROM {}. Secondary Indexes are designed to allow efficient querying of non-partition key columns. However, to solve the inverse query—given an email, fetch the user ID—requires a secondary index. Use Cassandra secondary index very carefully. Secondary index can locate data within a single node by its non-primary-key columns. SAI uses an extension of the Cassandra secondary index API to. ... at elaborating the problem that comes with Cassandra’s secondary indexes. SI on high or low carnality field is not a wise decision. SASI (SSTable Attached Secondary Index) is an improved version of a secondary index ‘affixed’ to SSTables. So here's the thing: Cassandra is very good at querying data by a specific key. Azure Cosmos DB is a resource governed system. {} WHERE timestamp > {} ALLOW FILTERING;" Secondary index group API. For implementation details on how to build a secondary index, the old Cassandra documentation is great. Currently, Allow Filtering only works for secondary Index column or clustering columns. 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. Cassandra API supports secondary indexes on all data types except frozen collection types, decimal and variant types. It is also good at retrieving a range of data within a partition. Usage of Cassandra retry connection policy. Since CASSANDRA-6377 queries without index filtering non-primary key columns are fully supported. 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