What's new in DataStax Distribution of Apache Cassandra 3.x
An overview of new features in the DataStax Distribution of Apache Cassandra 3.x.
The latest version of DataStax Distribution of Apache Cassandra 3.x is 3.9.
The CHANGES.txt describes the changes in detail. You can view all version changes by branch or tag in the drop-down list on the changes page.
New features Cassandra 3.2 and later
-graph option for cassandra-stress |
|
TTL for COPY FROM |
A TTL value can be specified when copying from CSV files. |
bulkloader can use third party authentication |
The bulkloader has an
option |
CREATE TABLE WITH ID |
If a table is accidentally dropped, it can be recreated with its ID and the commitlog replayed to regain data. |
Static columns can be indexed |
In Cassandra 3.4 and later, static columns can be indexed. |
New option for nodetool compact |
In Cassandra 3.4 and later, addition of --user-definedcompact to |
Display timestamp in sub-second precision |
In Cassandra 3.4 and later, timestamp defaults to include sub-second precision. |
nodetool gettimeout and nodetool settimeout |
In Cassandra 3.4 and later, two nodetool commands to print out or set the value of a timeout in milliseconds. |
jvm.options file for GC and some JVM options |
Some JVM options have been moved from the cassandra-env.sh file into the new jvm.options file. |
JBOD improvements |
Improvements to SSTable partitioning by token range have improved JBOD compaction and backup. See Improving JBOD for more details. A new command is available to support the improvements, nodetool relocatesstables. |
Clustering columns can be used in WHERE clause without secondary index |
In Cassandra 3.6 and later, clustering columns without a secondary index can be used in a WHERE clause, provided the ALLOW FILTERING clause is also used. |
Update and delete individual subfields of a user-defined type (UDT) |
In Cassandra 3.6 and later, if a UDT has only non-collection fields, an individual field value can be updated or deleted. |
PER PARTITION LIMIT |
In Cassandra 3.6 and later, a query can be limited to return results from each partition, such as a "Top 3" listing. |
CAS statistics added to nodetool proxyhistograms |
In Cassandra 3.6 and later, CAS read and write latency is displayed for compare-and-set operations. |
--hex-format option added to nodetool getsstables |
In Cassandra 3.6 and later, an option to use a hex-formatted key to get SSTables is added to nodetool getsstables. |
Static columns can now be used with SASI indexes |
In Cassandra 3.6 and later, static columns can be used with SASI indexes. |
Change Data Capture (CDC) logging |
In Cassandra 3.8 and later, change data capture (CDC) logging can be enabled. |
New features released in Cassandra 3.0
Storage engine refactored |
The Storage Engine has been refactored. |
Materialized Views |
Materialized views handle automated server-side denormalization, with consistency between base and view data. |
Support for Windows |
Support for Windows 7, Windows 8, Windows Server 2008, and Windows Server 2012. See DataStax Cassandra 3.0 Windows Documentation. |
Operations improvements | |
Addition of MAX_WINDOW_SIZE_SECONDS to DTCS compaction settings |
Allow DTCS compaction governance based on maximum window size rather than SSTable age. |
File-based Hint Storage and Improved Replay |
Hints are now stored in files and replay is improved. |
Default garbage collector is changed to G1 |
Default garbage collector is changed from Concurrent-Mark-Sweep (CMS) to G1. G1 performance is better for nodes with heap size of 4GB or greater. |
Changed syntax for CREATE TABLE compression options |
Made the compression options more consistent for |
Add nodetool command to force blocking batchlog replay |
BatchlogManager can force batchlog replay using nodetool. |
Nodetool over SSL |
Nodetool can connect using SSL like cqlsh. |
New nodetool options for hinted handoffs |
Nodetool options |
nodetool stop |
Nodetool option added to stop compactions. |
Other notable changes | |
Requires Java 8 |
Java 8 is now required. |
nodetool cfstats and nodetool cfhistograms renamed |
Renamed |
Native protocol v1 and v2 are dropped |
Native protocol v1 and v2 are dropped in Cassandra 3.0. |
DataStax AMI does not install Cassandra 3.0 or 3.x |
You can install Cassandra 2.1 and earlier versions on Amazon EC2 using the DataStax AMI (Amazon Machine Image) as described in the AMI documentation for Cassandra 2.1. To install Cassandra 3.0 and later on Amazon EC2, use a trusted AMI for your platform and the appropriate install method for that platform. |