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SocketCluster v11.3.1 Release Notes

Release Date: 2018-04-15 // about 6 years ago
    • ⬆️ Upgraded SCC:

    [email protected] (npm)

    ➕ Added support for skeleton-based rendezvous hashing by default - This means that adding or removing scc-broker instances to the cluster now requires fewer channel migrations that before - This means that downtime will affect a much smaller subset of channels when scaling out or scaling back. The more machines/instances there are in the cluster, the fewer channels will be affected when new machines/instances are added. You can use the old mapping engine by setting the clusterMappingEngine option in SC to 'simple' here: https://github.com/SocketCluster/socketcluster/blob/72d301146c37efa3de52b8acfc532767c1ec6cc6/sample/server.js#L37

    ➕ Added support for connection pooling so that a SocketCluster instance can now interact with an scc-broker instance through more connections; this is useful if you want to use large scc-broker instances that have more than one worker process - In this case, it should help to distribute the load more evenly across processes inside the scc-broker instance. You can set the clusterClientPoolSize option in SC; it defaults to 1 - Ideally this number should remain in the single-digit range. See https://github.com/SocketCluster/socketcluster/blob/72d301146c37efa3de52b8acfc532767c1ec6cc6/sample/server.js#L38

    • 0️⃣ Made ws the default WebSocket engine for maximum compatibility; a large number of users have been complaining about uws not working on some systems - It's better to have a default that always works out of the box (as not to scare away new users) and to make optimizations optional.

    💥 Breaking change

    • Switched to a custom uWS JS binding/module sc-uws; it's a drop-in replacement for uws.