Building package

sbt universal:stage

You'll get runnable application in target/universal/stage with scripts in target/universal/stage/bin.

To start app you'll have to create postgresql database

create user cluster with superuser CREATEDB password 'cluster';
create database cluster owner cluster;

You'll also have to create DB schema manually using src/main/resources/schema.sql

To clean journal and snapshots use

delete from journal where true;
delete from snapshot where true;

Start all nodes in nodes/nodeN directories

You can get cluster state using

curl localhost:8552/cluster/members/ | jq .

You can get sharding status on node2 using

curl localhost:8552/cluster/shards/ChatReader | jq .
curl localhost:8552/cluster/shards/ChatWriter | jq .

Stop node3 during slow message sending from node1 to see sharding rebalancing.