Plainwire 1.9 to 2.0

Plainwire 2.0 adds Redis and Scylla support, but neither requires a flag-day storage move.

Safe 2.0 first boot#

Keep messages on PostgreSQL:

PLAINWIRE_MESSAGE_BACKEND=postgres
PLAINWIRE_SCYLLA_ENABLED=false

Redis can be enabled after its service and password are configured:

PLAINWIRE_REDIS_ENABLED=true

Docker build change#

2.0 includes erlcass in the Erlang release. The Scylla driver compiles native code even when Scylla is disabled at runtime.

If an old 1.9 Dockerfile fails with:

cmake: command not found
Hook for compile failed

add CMake and the native driver dependencies to the builder image. See Docker deployment.

Do not enable Scylla during the code upgrade#

Get 2.0 stable on PostgreSQL first. Then introduce Scylla as a separate change using postgres -> dual -> scylla migration stages.

Redis behavior#

Redis is not durable authority. A Redis outage should degrade presence/cache/distributed rate acceleration without invalidating PostgreSQL data.

Validate old data#

After 2.0 is running, test existing accounts, friends, servers, permissions, DMs, channels, uploads, sessions, webhooks, and calls before adding new infrastructure changes.