code base on this example: https://docs.amazonaws.cn/en_us/amazondynamodb/latest/developerguide/Streams.KCLAdapter.Walkthrough.html the can duplicate at run time a table being populated by ycsb
docker run -d -p 8080:8080 -p 9042:9042 scylladb/scylla-nightly:4.4.dev-0.20201217.a60c81b61 --alternator-port 8080 --alternator-write-isolation always --experimental 1
# wait for scylla to be ready
# run the KCL example
./gradlew run --args='-e http://localhost:8080 -t usertable -k 1000'
# after ~30sec when tables created run ycsb
# running with local ycsb
python2.7 ./bin/ycsb load dynamodb -P workloads/workloada -P dynamodb.properties -p recordcount=1000 -p insertorder=uniform -p insertcount=1000 -p fieldcount=2 -p fieldlength=50 -s
# running with docker ycsb [keep in mind you localhost won't work inside docker, and you need a real address of you network interface]
echo "accessKey=" > aws_dummy
echo "secretKey=" >> aws_dummy
docker run -v `pwd`/aws_dummy:/YCSB/aws_dummy -w /YCSB scylladb/hydra-loaders:ycsb-jdk8-20200326 ./bin/ycsb load dynamodb -P workloads/workloada \
-p dynamodb.endpoint=http://192.168.122.1:8080 -p dynamodb.primaryKey=p -p dynamodb.awsCredentialsFile=aws_dummy \
-p recordcount=10000 -p insertorder=uniform -p insertcount=1000 -p fieldcount=2 -p fieldlength=50 -s
# when you want to clear it out and try again
cqlsh> DROP KEYSPACE "alternator_streams-adapter-demo"; DROP KEYSPACE "alternator_usertable"; DROP KEYSPACE "alternator_usertable-dest";
export KCL_DOCKER_IMAGE=scylladb/hydra-loaders:kcl-jdk8-$(date +'%Y%m%d')
docker build . -t ${KCL_DOCKER_IMAGE}
docker push ${KCL_DOCKER_IMAGE}
echo "${KCL_DOCKER_IMAGE}" > image- - dockerize it for usage in SCT