Demo Scylla Alternator TTL with Docker

Demo Scylla Alternator TTL with Docker

## Start Scylla
docker run --name some-scylla -d scylladb/scylla:5.1.0-rc4 --alternator-port 8000 --alternator-write-isolation=always

## Download config
docker cp some-scylla:/etc/scylla/scylla.yaml .

## Config updates

# Uncomment to enable experimental features
experimental_features:
#     - udf
#     - alternator-streams
      - alternator-ttl
#     - raft

alternator_ttl_period_in_seconds: 15

## Upload new config
docker cp ./scylla.yaml some-scylla:/etc/scylla/scylla.yaml

## Restart Scylla to load the new config
docker exec -it some-scylla supervisorctl restart scylla

## Create table
aws  --endpoint-url 'http://172.17.0.2:8000'  dynamodb create-table --table-name MusicCollection --attribute-definitions AttributeName=Artist,AttributeType=S AttributeName=SongTitle,AttributeType=S --key-schema AttributeName=Artist,KeyType=HASH AttributeName=SongTitle,KeyType=RANGE --provisioned-throughput ReadCapacityUnits=5,WriteCapacityUnits=5

## Set TTL
aws  --endpoint-url 'http://172.17.0.2:8000' dynamodb update-time-to-live --table-name MusicCollection --time-to-live-specification "Enabled=true, AttributeName=ttl"

## Put an item with TTL of now() + 30s
aws  --endpoint-url 'http://172.17.0.2:8000' dynamodb put-item \
    --table-name MusicCollection  \
    --item \
        '{"Artist": {"S": "No One You Know"}, "SongTitle": {"S": "Call Me Today"}, "AlbumTitle": {"S": "Somewhat Famous"}, "Awards": {"N": "1"}, "ttl": {"N": "'$(($(date +%s)+30))'"}}'

## Scan the table (repeat till value is gone)
aws  --endpoint-url 'http://172.17.0.2:8000' dynamodb scan --table-name MusicCollection