April 30, 2019
With the release of CockroachDB v19.1, we’ve made a variety of security, performance, and usability improvements. A few highlights:
Native Change Data Capture: CockroachDB extends its streaming data capabilities by enabling data to flow more easily to backend warehouses, with support for publishing distributed, row-level change feeds directly into cloud storage for downstream processing.
High-performance multi-region deployments: Our cost-based optimizer can now use data locality to optimize queries so you can get low-latency queries even when your data may be spread across regions. We’ve also added follower reads to improve read performance for certain geo-distributed workloads.
Check out a comprehensive summary of the most significant, user-facing changes and then upgrade to CockroachDB v19.1. You can also read more about these changes in the v19.1 blog post or sign up for our live webinar on May 9th where we'll dive into the details of the new capabilities.
Get future release notes emailed to you:
$ docker pull cockroachdb/cockroach:v19.1.0
This section summarizes the most significant, user-facing changes in v19.1.0. For a complete list of features and changes, including bug fixes and performance improvements, see the release notes for previous testing releases.
- Managed service offering
- Enterprise features
- Core features
- Backward-incompatible changes
- Known limitations
Managed service offering
|Managed CockroachDB Console||Paid managed CockroachDB customers can now sign into their organization's account, view the connection string details, add and edit their IP whitelists on the management console.|
|Encryption at Rest||Encryption at rest provides transparent encryption of a node's data on the local disk. This feature was introduced as experimental in v2.1 and is now ready for production use.|
|GSSAPI with Kerberos Authentication||CockroachDB now supports the Generic Security Services API (GSSAPI) with Kerberos authentication, which lets you use an external enterprise directory system that supports Kerberos, such as Active Directory.|
|Follower Reads||This feature reduces read latencies by allowing queries to perform historical reads of the closest replica of a given piece of data rather than reading from the more distant "leaseholder" replica. To enable follower reads on a query, use the
|Prefer Closest Secondary Index||Given multiple identical indexes that have different locality constraints using replication zones, the cost-based optimizer will now prefer the index that is closest to the gateway node that is planning the query. In a properly configured geo-distributed cluster, this can lead to performance improvements due to improved data locality and reduced network traffic. This feature enables scenarios where reference data such as a table of postal codes can be replicated to different regions, and queries will use the copy in the same region.|
|Change Data Capture||CDC in v19.1 includes many improvements to production-readiness.
These features are freely available in the core version and do not require an enterprise license.
|Load-Based Splitting||CockroachDB now automatically splits frequently accessed keys into smaller ranges to optimize your cluster’s performance.|
|Query Optimizer Hints||The cost-based optimizer now supports hint syntax to force the use of merge, hash, or lookup joins. This let you override the cost-based optimizer's join algorithm selection in cases where you have information about your data that the cost-based optimizer does not yet have.|
|Correlated Subqueries||Most correlated subqueries are now decorrelated and processed by the cost-based-optimizer. For those that cannot be decorrelated, CockroachDB now emits an "apply" operator that executes a sub-plan for every row in its input. This allows CockroachDB to execute a large number of additional correlated subqueries that were not able to be executed in v2.1.|
|Core Changefeeds||CockroachDB now offers a non-enterprise version of change data capture, via the
|Cost-Based Optimizer||The cost-based optimizer now supports almost all read-only queries (except window functions) and almost all mutations (e.g.,
|Logical Plans in the Admin UI||The Statement Details page in the Admin UI now shows the ordered steps CockroachDB will take to execute a query (i.e., the
|Cascading Replication Zones||Newly created replication zones will now inherit empty values from their parent. For example, if the replication zone for a table is not explicitly set with
|Custom Savepoints||CockroachDB now supports custom naming of
Before upgrading to CockroachDB v19.1.0, be sure to review the following backward-incompatible changes and adjust your application as necessary.
CockroachDB no longer supports the
B'abcde'notation to express byte array literals. This notation now expresses bit array literals like in PostgreSQL. The
b'...'notation remains for byte array literals.
The normalized results of certain timestamp + duration operations involving year or month durations have been adjusted to agree with the values returned by PostgreSQL.
experimental-avrooption has been renamed
Timezone abbreviations, such as
EST, are no longer allowed when parsing or converting to a date/time type. Previously, an abbreviation would be accepted if it were an alias for the session's timezone.
The way composite foreign key matches are evaluated has changed to match the Postgres behavior. If your schema currently uses composite keys, it may require updates, since this change may affect your foreign key constraints and cascading behavior. For more details and guidance, see this note.
Mutation statements like
DELETEno longer attempt to guarantee mutation or output ordering when an
ORDER BYclause is present. It is now an error to use
For information about limitations we've identified in CockroachDB v19.1, with suggested workarounds where applicable, see Known Limitations.
|Geo-Partitioning||Added a video and tutorial on using geo-partitioning to get very fast reads and writes in a broadly distributed cluster.|
|Security||Added an overview of CockroachDB security, with a dedicated page on authentication, encryption, authorization, and SQL audit logging.|
|Troubleshooting||Added much more guidance on troubleshooting cluster setup and troubleshooting SQL behavior.|
|Architecture||Added the Life of a Distributed Transaction, which details the path that a query takes through CockroachDB's architecture, starting with a SQL client and progressing all the way to RocksDB (and then back out again). Also added Reads and Writes in CockroachDB, which explains how reads and writes are affected by the replicated and distributed nature of data in CockroachDB.|
|Production Guidance||Expanded the Production Checklist with more current hardware recommendations and additional guidance on storage, file systems, and clock synchronization. Also added a library of common Cluster Topology Patterns.|
|ORMs||Expanded the SQLAlchemy tutorial to provide code for transaction retries and best practices for using SQLAlchemy with CockroachDB.|
|Training||Added geo-partitioning, Kubernetes, and TPC-C benchmarking modules to the intro to CockroachDB training.|
Sign up for the v19.1 release webinar
We’ll discuss what we built, why we built it, and where CockroachDB is heading in the near future.