Scylla is an open source NoSQL database that provides the same Apache Cassandra Cassandra Query Language (CQL) interface, and the same level extensions and fault tolerance. 3.1 has been released, the contents are:
Support I3en server: Amazon EC2 I3en series can be used on AWS, which provides storage density is much higher than other nodes, the storage capacity on a single server up to 60 TB. Scylla has been extensively tested on these servers, which now Scylla 3.1 are supported.
3.0 is enabled by default SSTable: SSTable 3.0 format with Apache Cassandra "mc" compatible, originally provided in the Scylla 3.0 in. This format can save 50% or more of disk space. It is now the default format. However, if you want to keep the old SSTable format, can be obtained by scylla.yaml settings to disable this feature:
enable_sstables_mc_format: false
Local secondary indexes : this release, Scylla supports local and global secondary indexes, Scylla users can now also use a local secondary index, which can improve the efficiency of the query.
Materialized view improvements : Scylla way to deal materialized view made two changes. A first method by avoiding updating unselected column to minimize the number of updates generated view; in addition, by adding support for local secondary indexes (i.e., when the index table resides on the same basic data partitions), improved performance while the index of the specified partition key query.
CACHE BYPASS the CQL: BYPASS on the SELECT statement Scylla Enterprise 2019.1.1 introduced CACHE now introduced in this version. This function tells the database, less likely to read data being read in the near future and are unlikely to read the data. Thus, we should not attempt to read data from the cache or the cache filled with data.
E.g:
SELECT * from heartrate BYPASS CACHE;
IOCB CMD SPoll support: On Linux version 4.19 or later, Scylla will use a new method to wait for a network event --IOCB_CMD_Poll
CQL Group Functions Count now applies to the type of Bytes
For more, see the release notes:
https://www.scylladb.com/2019/10/15/introducing-scylla-open-source-3-1/