cassandra secondary index vs allow filtering

Secondary index can locate data within a single node by its non-primary-key columns. So here's the thing: Cassandra is very good at querying data by a specific key. Secondary Index. Use Cassandra secondary index very carefully. Secondary Indexes are designed to allow efficient querying of non-partition key 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). SASI (SSTable Attached Secondary Index) is an improved version of a secondary index ‘affixed’ to SSTables. SI on high or low carnality field is not a wise decision. Currently, Allow Filtering only works for secondary Index column or clustering columns. 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 ... at elaborating the problem that comes with Cassandra’s secondary indexes. 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. However, to solve the inverse query—given an email, fetch the user ID—requires a secondary index. It makes sense to also support filtering on clustering-columns. Azure Cosmos DB is a resource governed system. Secondary index group API. 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. 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. Cassandra API supports secondary indexes on all data types except frozen collection types, decimal and variant types. Since CASSANDRA-6377 queries without index filtering non-primary key columns are fully supported. It is also good at retrieving a range of data within a partition. 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. You can use execute queries that use a secondary index without ALLOW FILTERING – more on that later. Usage of Cassandra retry connection policy. For implementation details on how to build a secondary index, the old Cassandra documentation is great. 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