Release of Canton 2.6.4

Canton 2.6.4 has been released on May 04, 2023. You can download the Daml Open Source edition from the Daml Connect Github Release Section. The Enterprise edition is available on Artifactory.
Please also consult the full documentation of this release.

Summary

This is a maintenance release of Canton, addressing a few issues.

We fixed a bug where the participant could not properly restart after a crash under high load. The issue can be detected through log messages of the type WARN c.d.c.p.DynamicDomainParametersLookup:participant=XXX/domain=YYY - Querying for list of domain parameters changes valid at T has not completed after N seconds. If encountered, it can be fixed by upgrading to a Daml version containing this patch and restarting the node.
We improved the throttling of the asynchronous message processing to limit the required memory resources required by a participant while catching up with a domain. If the node has fallen behind sufficiently and is memory constrained, this can lead to OutOfMemory exceptions that will happen periodically until the node is caught up again. If encoutered, it can be fixed by upgrading to a Daml version containing this patch and restarting the node or by granting substantially more memory to the process.

The following Canton protocol and Ethereum sequencer contract versions are supported:

Dependency	Version
Canton protocol versions	3, 4
Ethereum contract versions	1.0.0, 1.0.1

Canton has been tested against the following versions of its dependencies:

Dependency	Version
Java Runtime	OpenJDK 64-Bit Server VM Zulu11.62+17-CA (build 11.0.18+10-LTS, mixed mode)
Postgres	postgres (PostgreSQL) 14.7 (Debian 14.7-1.pgdg110+1)
Oracle	19.15.0
Besu	besu/v22.1.3/linux-x86_64/openjdk-java-11
Fabric	2.2.2