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Migrating from PrestoSQL to Trino

As we previously announced, we’re rebranding Presto SQL as Trino. Now comes the hard part: migrating to the new version of the software. We just released the first version, Trino 351, which uses the name Trino everywhere, both internally and externally. Unfortunately, there are some unvoidable compatibility aspects that administrators of Trino need to know about. We hope this post makes makes the transition as smooth as possible.

Things that haven’t changed

Let’s start with the good news. For end users running queries against Trino, everything should be the same. There are no changes to the SQL language, SQL functions, session properties, etc.

Users now see Trino in error messages, a different logo in the web UI, and error stack traces have a different package name, but otherwise they won’t know that anything has changed. All of their views, reports, or other stored queries will work as before.

Similarly for administrators, except for a few things noted in the Trino 351 release notes, all the configuration properties are the same.

Client protocol compatiblity

The client protocol is how clients, such as the CLI or JDBC driver, talk to Trino. It uses standard HTTP as the underlying communications protocol, with some custom HTTP headers to communicate values to and from Trino. Unfortunately, those header names started with X-Presto- and thus had to be changed to X-Trino-.

The Trino CLI and JDBC driver send the new headers, so they are only compatible with Trino versions 351 and newer. Users should wait to upgrade the CLI or JDBC driver until the Trino servers they talk to have been upgraded.

Out of the box, the Trino server does not work with older clients. However, in order to support a graceful transition, you can allow the server to support older clients by adding a configuration property:

protocol.v1.alternate-header-name=Presto

We recommend using version 350 of CLI and JDBC driver as the transition version. It has all the newest features such as variable precision timestamps, has been tested with a range of older server versions, and is the last version to support older servers.

JDBC driver

The URL prefix for the JDBC driver now starts with jdbc:trino: instead of jdbc:presto:. This means that any client applications using the JDBC driver need to update their connection configuration. The old prefix is still supported, but will be removed in a future release.

The class name of the driver is now io.trino.jdbc.TrinoDriver. This is of no concern to most users, as the driver is normally accessed via the standard JDBC auto-discovery mechanism based on the URL. As with the URL prefix, the old name is still supported, but will be removed in a future release.

Server RPM

The name of the RPM has changed, so it is treated as a different RPM, and thus you cannot simply upgrade from the old version to the new version. All of the directories for the RPM that contained the name presto now use trino instead. You likely want to uninstall the old RPM, rename the config and log directories, then install the new RPM.

Docker image

The Trino Docker image is now published as trinodb/trino. The supported configuration directory is now /etc/trino. The CLI is now named trino instead of presto.

JMX MBean naming

Trino runs on the JVM, which has the JMX framework as a standard way to expose system and application metrics. Trino exposes a huge number of JMX metrics for administrators to monitor their clusters. You might be using these metrics via your monitoring system, or perhaps you are accessing them in SQL via the Trino JMX connector.

The metrics for Trino server now start with trino instead of presto. You might need to update this name in your monitoring system, or you can revert to the old name:

jmx.base-name=presto

Similarly, the metrics for the Elasticsearch, Hive, Iceberg, Raptor, and Thrift connectors now start with trino.plugin instead of presto.plugin. Again, you might need to update these names in your monitoring system, or you can revert to the old name. For example, for the Hive connector:

jmx.base-name=presto.plugin.hive

Thrift connector

The Thrift connector had many backwards incompatible changes to both the Thrift service interface and the configuration properties. You need update all of your implementations of the Thrift service used by the connector.

SPI

If you have any custom plugins for Trino, such as connectors or functions, these need to be updated. The package name is now io.trino.spi, and a few classes were renamed:

  • PrestoException to TrinoException
  • PrestoPrincipal to TrinoPrincipal
  • PrestoWarning to TrinoWarning

There are no functional changes, so all you should need to do is update your imports and rename the references to the above class names.

Migration guide

Now that you understand what is different and what you need to change, you can start thinking about the list of steps needed to perform the migration. The following is a rough plan for upgrading your environment.

Step 1: Prepare to deploy the new version

  • Let users know the name is changing, so they are not surprised by the logo changes in the UI.
  • Make sure that users are using recent client versions. Ideally, upgrade them all to version 350, as mentioned above. You can check the HTTP request logs for the coordinator to see what client versions are in use.
  • Update your server configuration with protocol.v1.alternate-header-name=Presto to allow supporting all of your existing Presto clients.
  • If you are using the RPM, have a plan to deal with the new RPM name and the trino directory names.
  • If you are using Docker, use the new image name, make sure your configuration will be mounted using the trino path name, and remember that the CLI is now named trino.
  • Update any custom plugins to use the new SPI.
  • Check if you have anything using JMX to monitor your clusters, and decide if you will update them to the new names or set a Trino config to revert to the old names.

Step 2: Upgrade your servers to Trino 351+

  • Upgrade development and staging servers.
  • Upgrade production servers. If you have multiple clusters, you can do them one at a time, and verify everything is working before moving on to the next one.

Step 3: Upgrade clients

  • Upgrade all clients including the CLI, JDBC driver, Python, etc., to the Trino versions.
  • Update any applications using JDBC to use the new jdbc:trino: connection URL prefix.

Step 4: Cleanup

  • Remove the protocol.v1.alternate-header-name configuration property.
  • If you configured Trino to use the old JMX names, convert your monitoring system to use the new JMX names and remove the fallback configs.

Getting help

We’re here to help! If you run into any issues while upgrading, or having any questions or concerns, ask on Slack.