Release Avatica Go 4.0.0

Apache Calcite Avatica Go 4.0.0 is a major release with numerous improvements and a breaking change for Apache Phoenix. As this a a new major version, users of this package will need to upgrade their import paths to "".

Breaking change for Apache Phoenix (CALCITE-2763): In Apache Phoenix, null and empty strings are equivalent. For some background on why this is the case, see PHOENIX-947. In version 3 of Avatica-Go and below, null and empty strings are returned as an empty string "" to the client. This prevented database/sql’s built in NullString type from working correctly. From 4.0.0 onwards, null and empty strings will be returned as a nil. This allows the usage of the sql.NullString type.

For this release, both dep and Go modules are supported for package management. As Go modules will be turned on by default in Go 1.13.0 (estimated to be released in September/October 2019), it is highly recommended that users of this package start migrating to using Go modules to ease the transition.

The Calcite team recommends users of this package to upgrade to this version, where practical, as the dependencies being used by this package have also been upgraded.

See the release notes; download the release.

Release 1.15.0

Apache Calcite Avatica 1.15.0 is a small release that fixes a regression causing error messages to not be propagated to clients. There is also a minor update to the docker release script to automate the upload of release artifacts and build promotion. See the list of bug fixes and new features for more information.

Consumers of Avatica are encouraged to skip the 1.14.0 release and upgrade directly to 1.15.0 due to the aforementioned regression.

See the release notes; download the release.

Release 1.14.0

Apache Calcite Avatica 1.14.0 includes around 13 bug fixes and new features.

A number of dependencies were upgraded for this release, with Jetty being a noteworthy upgrade due to the old version having a medium severity vulnerability. Avatica users are encouraged to upgrade to 1.14.0 where practical.

See the release notes; download the release.

Release Avatica Go 3.2.0

Apache Calcite Avatica Go 3.2.0 is a minor release of Avatica Go with fixes to the import paths after enabling support for Go modules.

The 3.1.0 release contained a bug where packages within the library used the "" import path rather than the "" import path. This resulted in an issue where 2 versions of the library are being used at the same time, causing some programs to not build.

The Calcite team recommends consumers of the Avatica Go library to not use the 3.1.0 release and ensure that the 3.2.0 release is being used.

See the release notes; download the release.

Release Avatica Go 3.1.0

Apache Calcite Avatica Go 3.1.0 is a minor release of the Avatica Go client to bring in support for Go modules. This release includes updated dependencies, testing against more targets and support for Go Modules.

Go 1.11 along with Go modules support was released at the end of August 2018. Go modules will become the official package management solution for Go projects. As the Go team currently supports both Go 1.11 and Go 1.10, the Gopkg.toml and Gopkg.lock files are still available for those using dep for package management. We plan to remove support for dep when Go 1.12 is released in early 2019, so we encourage users to upgrade to Go 1.11 and use Go modules where possible.

See the release notes; download the release.

Release Avatica Go 3.0.0

Apache Calcite Avatica Go 3.0.0 is the first release of the Avatica Go database/sql driver since the code has been donated to the Apache Calcite project. This release includes support for Avatica with the HSQLDB backend, updated dependencies and bug fixes.

There is a breaking change where the Name() method on the ResponseError error type has been changed to a property, Name.

Users of the current Boostport/avatica library are encouraged to update to this new version of apache/calcite-avatica-go as further development will take place in the apache/calcite-avatica-go repository.

For most users, the updating is simply replacing the import path _ with _

See the release notes; download the release.

Release 1.10.0

Apache Calcite Avatica 1.10.0 adds support for JDBC Array data, Docker, and JDK 9.

From this release onwards, Docker images for Avatica Server are published to Docker Hub. These make Avatica easier than ever to run.

As the Calcite and Avatica projects become more separate, it is the first release since Avatica’s git repository separated from Calcite’s repository.

Avatica now runs on JDK 9 (and continues to run on JDK 7 and 8).

Clients may now send and receive Array data via the JDBC API. There are improvements to date/time support in DateTimeUtils, and over 20 other new features and bug fixes.

See the release notes; download the release.

New Avatica Repository

Roughly one year after Avatica’s Maven build was separated from Calcite’s (as described in this previous post), Avatica now has its own Git repository.

The Apache Calcite PMC felt like it was a good time to lift the Avatica project out of the Calcite repository, given the continue maturation of Avatica. For developers and contributors to Avatica, nothing will functionally change, except for the location of the code itself.

The de-facto repository can be found at the ASF’s Git hosting, with a mirrored-copy also available on Github at apache/calcite-avatica.

Release 1.9.0

Apache Calcite Avatica 1.9.0 includes various improvements to make it more robust and secure, while maintaining API and protocol compatibility with previous versions.

We now include non-shaded and shaded artifacts, to make it easier to embed Avatica in your application.

There are improvements to the JDBC API, adding support for canceling statements, and improving type conversions and metadata.

The transport is upgraded to use protobuf-3.1.0 (previously 3.0 beta); we have also upgraded Jetty.

See the release notes; download the release.

Release 1.8.0

Apache Calcite Avatica 1.8.0 continues the focus on compatibility with previous versions while also adding support for authentication between Avatica client and server. Performance, notably on the write-path, is also major area of improvement in this release, increasing as much as two to three times over previous versions with the addition of new API support. The documentation for both users and developers continues to receive improvements.

Authentication is a major theme of this release, providing multiple layers of additional authentication mechanisms over previous versions. In these earlier versions, the only authentication provided by Avatica was achieved via the JDBC URL’s standard user and password options. These have always been passed directly into the backend database’s authentication system, but not all databases provide username and password based authentication systems. CALCITE-1173 adds Avatica-level authentication over HTTP Basic and HTTP Digest authentication mechanisms. These are provided specifically for the case when Avatica is used with a database that does not already provide its own authentication implementation.

Some systems rely on Kerberos for strong, centrally- managed authentication. CALCITE-1159 introduces Kerberos-based authentication for clients via SPNEGO. The Avatica server can be configured to only allow clients with a valid Kerberos ticket, optionally, also passing this information to the backend database to implement basic “impersonation” (where the Avatica server issues requests on behalf of the end user).

Building on top of the work done in Avatica-1.7.0 in CALCITE-1091, this release also contains CALCITE-1128 which implements the batch-oriented JDBC APIs on Statement. Through careful inspection, it was observed that the overall performance of Avatica clients in 100% write workloads was dominated by the cost of the HTTP calls. By leveraging the Statement#addBatch() and Statement#executeBatch() API calls, clients can efficiently batch multiple updates in a single HTTP call. In testing this over the previous single HTTP call per update with Apache Phoenix, it was observed that performance increased by two to three times, bringing Avatica’s performance on par with the Phoenix “native” driver.

Returning back to compatibility, a new component appears in this release which is designed to test versions of Avatica against each other. CALCITE-1190 introduces a “Technology Compatibility Kit” (TCK) which automates the testing of one version of Avatica against other versions. To further ease this testing, a runnable JAR to launch an HSQLDB instance and an Avatica server also makes it debut with these changes. This TCK makes it much easier to run tests of newer clients against older servers and vice versa. Validating the backwards compatibility that is being built is extremely important to be confident in the guarantees being provided to users.

Finally, a number of bugs are also fixed in the Protocol Buffer wire API. Some of these include CALCITE-1113 and CALCITE-1103 which fix how certain numbers are serialized, CALITE-1243 which corrects some fields in Protocol Buffer messages which were incorrectly marked as unsigned integers instead of signed integers, and CALCITE-1209 which removes incorrect parsing of binary fields as Base64-encoded strings. All of these issues are fixed in a backwards-compatible manner and should have no additional negative impact on older clients (older clients will not break, but they may continue to return incorrect data for certain numbers).

For users of the Avatica driver, a new client reference page is added which details the options that are available in the Avatica JDBC Driver’s URL. The wire API documentation for Protocol Buffers continues to receive updates as the API continues to evolve.

See the release notes; download the release.

Release 1.7.1

Apache Calcite’s PMC has just released Avatica 1.7.1, the first release of Avatica as an independent project. We’re excited because it makes Avatica easier to use, and allows us to be more agile in our release schedule.

(Avatica was previously released as part of Calcite. Avatica is still governed by Apache Calcite’s PMC, and stored in the same git repository as Calcite, but releases are no longer synchronized, and Avatica does not depend on any Calcite modules.)

A significant portion of the work of this release was “Maven work” to separate the build and release processes, but there were several important bug fixes, including a security fix for Jetty (see below).

Performance, specifically on the write path, was a big focus in this release. [CALCITE-1091] contained a number of important changes. Some of these changes (e.g. [CALCITE-1092] and [CALCITE-1093]) were related to heap usage in the Avatica server, while [CALCITE-1094] and [CALCITE-1117] were strictly performance-related.

The latter improved performance the most. Switching to the Apache Commons HttpComponents Client library instead of using the Java platform’s built-in HttpURLConnection, we noticed a 15% improvement in pure write workloads.

Three dependent library upgrades:

  • We completely removed Commons Logging in favor of SLF4J in [CALCITE-669]. This logging framework update will allow downstream integrators to use the logging implementation of their choice instead of being forced to inherit Commons Logging.
  • We upgraded Jackson from 2.1.1 to 2.6.3 in [CALCITE-1021].
  • We upgraded Jetty from 9.2.7.v20150116 to 9.2.15.v20160210 in [CALCITE-1156] to fix a security issue.

Note that Avatica’s Maven coordinates have changed. The groupId is now “org.apache.calcite.avatica” (previously “org.apache.calcite”), and artifactIds are “avatica”, “avatica-metrics”, “avatica-metrics-dropwizardmetrics3”, “avatica-noop-driver”, “avatica-server” (previously “calcite-avatica”, etc.). Make sure to update these when upgrading to this version.

See the release notes; download the release.

Splitting Avatica from Calcite

This marks the separation of Avatica from its previous location as a sub-module of Apache Calcite’s Maven build.

This separation is not to remove Avatica from the governance of the Apache Calcite project, but to allow for even more rapid releases from both the Avatica and Calcite projects. We can confidently make new releases of each without having to worry about the current state of development features in the other.

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