ScalarDB Server
ScalarDB Server is a gRPC server that implements ScalarDB interface. With ScalarDB Server, you can use ScalarDB features from multiple programming languages that are supported by gRPC.
Currently, we provide only a Java client officially, and we will support other language clients officially in the future. Of course, you can generate language-specific client stubs by yourself. However, note that it is not necessarily straightforward to implement a client since it's using a bidirectional streaming RPC in gRPC, and you need to be familiar with it.
This document explains how to install and use ScalarDB Server.
Install prerequisites
ScalarDB Server is written in Java. So the following software is required to run it.
- Oracle JDK 8 (OpenJDK 8) or higher
Install ScalarDB Server
We have Docker images in our repository and zip archives of ScalarDB Server available in releases.
If you are interested in building from source, run the following command:
./gradlew installDist
Of course, you can archive the jar and libraries by ./gradlew distZip and so on.
Configure ScalarDB Server
You need a property file holding the configuration for ScalarDB Server. It contains two sections, Server configurations and Underlying storage/database configurations.
#
# Server configurations
#
# Port number of ScalarDB Server. 60051 by default
#scalar.db.server.port=60051
# Prometheus exporter port. Use 8080 if this is not given. Prometheus exporter will not be started if a negative number is given.
#scalar.db.server.prometheus_exporter_port=8080
#
# Underlying storage/database configurations
#
# Comma separated contact points
scalar.db.contact_points=localhost
# Port number for all the contact points. Default port number for each database is used if empty.
#scalar.db.contact_port=9042
# Credential information to access the database
#scalar.db.username=cassandra
#scalar.db.password=cassandra
# Storage implementation. Either cassandra or cosmos or dynamo or jdbc can be set. Default storage is cassandra.
#scalar.db.storage=cassandra
Start ScalarDB Server
For Docker images, you can start ScalarDB Server with the following commands:
docker pull ghcr.io/scalar-labs/scalardb-server:<version>
docker run -v <your local property file path>:/scalardb/server/database.properties -d ghcr.io/scalar-labs/scalardb-server:<version>
For zip archives, you can start ScalarDB Server with the following commands:
unzip scalardb-server-<version>.zip
cd scalardb-server-<version>
bin/scalardb-server --config <your property file path>
Usage of the Java client of ScalarDB Server
You can use the Java client of ScalarDB Server in almost the same way as other storages/databases.
The difference is that you need to set scalar.db.storage and scalar.db.transaction_manager to grpc in your client side property file.
# Comma separated contact points
scalar.db.contact_points=<ScalarDB Server host>
# Port number for all the contact points
scalar.db.contact_port=60051
# Storage implementation
scalar.db.storage=grpc
# The type of the transaction manager
scalar.db.transaction_manager=grpc
# The deadline duration for gRPC connections. The default is 60000 milliseconds (60 seconds)
#scalar.db.grpc.deadline_duration_millis=