feat(sink): Support cassandra sink

integration_tests/cassandra-and-syclladb-sink/README.md

@@ -0,0 +1,65 @@
+# Demo: Sinking to Cassandra/Scylladb
+
+In this demo, we want to showcase how RisingWave is able to sink data to Cassandra.
+
+1. Set the compose profile accordingly:
+Demo with Apache Cassandra:
+```
+export COMPOSE_PROFILES=cassandra
+```
+
+Demo with Scylladb
+```
+export COMPOSE_PROFILES=scylladb
+```
+
+2. Launch the cluster:
+
+```sh
+docker-compose up -d
+```
+
+The cluster contains a RisingWave cluster and its necessary dependencies, a datagen that generates the data, a Cassandra for sink.
+
+
+3. Create the Cassandra table via cqlsh:
+
+Login to cqlsh
+```sh
+# cqlsh into cassandra
+docker compose exec cassandra cqlsh
+# cqlsh into scylladb
+docker compose exec scylladb cqlsh
+```
+
+Run the following queries to create keyspace and table.
+```sql
+CREATE KEYSPACE demo WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 1};
+use demo;
+CREATE table demo_bhv_table(
+    user_id int primary key,
+    target_id text,
+    event_timestamp timestamp,
+);
+```
+
+3. Execute the SQL queries in sequence:
+
+- create_source.sql
+- create_mv.sql
+- create_sink.sql
+
+4. Execute a simple query to check the sink results via csqlsh:
+
+Login to cqlsh
+```sh
+# cqlsh into cassandra
+docker compose exec cassandra cqlsh
+# cqlsh into scylladb
+docker compose exec scylladb cqlsh
+```
+
+Run the following query
+```sql
+select user_id, count(*) from my_keyspace.demo_test group by user_id;
+```

integration_tests/cassandra-and-syclladb-sink/create_mv.sql

@@ -0,0 +1,7 @@
+CREATE MATERIALIZED VIEW bhv_mv AS
+SELECT
+    user_id,
+    target_id,
+    event_timestamp
+FROM
+    user_behaviors;

integration_tests/cassandra-and-syclladb-sink/create_sink.sql

@@ -0,0 +1,11 @@
+CREATE SINK bhv_cassandra_sink
+FROM
+    bhv_mv WITH (
+    connector = 'cassandra',
+    type = 'append-only',
+    force_append_only='true',
+    cassandra.url = 'cassandra:9042',
+    cassandra.keyspace  = 'demo',
+    cassandra.table = 'demo_bhv_table',
+    cassandra.datacenter = 'datacenter1',
+);

integration_tests/cassandra-and-syclladb-sink/create_source.sql

@@ -0,0 +1,18 @@
+CREATE table user_behaviors (
+    user_id int,
+    target_id VARCHAR,
+    target_type VARCHAR,
+    event_timestamp TIMESTAMP,
+    behavior_type VARCHAR,
+    parent_target_type VARCHAR,
+    parent_target_id VARCHAR,
+    PRIMARY KEY(user_id)
+) WITH (
+    connector = 'datagen',
+    fields.user_id.kind = 'sequence',
+    fields.user_id.start = '1',
+    fields.user_id.end = '1000',
+    fields.user_name.kind = 'random',
+    fields.user_name.length = '10',
+    datagen.rows.per.second = '10'
+) FORMAT PLAIN ENCODE JSON;

integration_tests/cassandra-and-syclladb-sink/docker-compose.yml

@@ -0,0 +1,82 @@
+---
+version: "3"
+services:
+  cassandra:
+    image: cassandra:4.0
+    ports:
+      - 9042:9042
+    environment:
+      - CASSANDRA_CLUSTER_NAME=cloudinfra
+    profiles:
+      - cassandra
+  scylladb:
+    image: scylladb/scylla:5.1
+    ports:
+      - 9042:9042
+    environment:
+      - CASSANDRA_CLUSTER_NAME=cloudinfra
+    profiles:
+      - scylladb
+  compactor-0:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: compactor-0
+  compute-node-0:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: compute-node-0
+  etcd-0:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: etcd-0
+  frontend-node-0:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: frontend-node-0
+  grafana-0:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: grafana-0
+  meta-node-0:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: meta-node-0
+  connector-node:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: connector-node
+  minio-0:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: minio-0
+  prometheus-0:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: prometheus-0
+  message_queue:
+    extends:
+      file: ../../docker/docker-compose.yml
+      service: message_queue
+  datagen:
+    build: ../datagen
+    depends_on: [message_queue]
+    command:
+      - /bin/sh
+      - -c
+      - /datagen --mode clickstream --qps 2 kafka --brokers message_queue:29092
+    restart: always
+    container_name: datagen
+volumes:
+  compute-node-0:
+    external: false
+  etcd-0:
+    external: false
+  grafana-0:
+    external: false
+  minio-0:
+    external: false
+  prometheus-0:
+    external: false
+  message_queue:
+    external: false
+name: risingwave-compose

java/connector-node/assembly/assembly.xml

@@ -40,6 +40,7 @@
 
                 <!-- Sink connectors -->
                 <include>*:risingwave-sink-es-7</include>
+                <include>*:risingwave-sink-cassandra</include>
                 <include>*:risingwave-sink-jdbc</include>
                 <include>*:risingwave-sink-iceberg</include>
                 <include>*:risingwave-sink-deltalake</include>

java/connector-node/assembly/pom.xml

@@ -33,6 +33,10 @@
             <groupId>com.risingwave.java</groupId>
             <artifactId>risingwave-sink-es-7</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.risingwave.java</groupId>
+            <artifactId>risingwave-sink-cassandra</artifactId>
+        </dependency>
         <dependency>
             <groupId>com.risingwave.java</groupId>
             <artifactId>risingwave-sink-jdbc</artifactId>

java/connector-node/risingwave-connector-service/pom.xml

@@ -99,5 +99,10 @@
             <artifactId>risingwave-sink-es-7</artifactId>
             <scope>provided</scope>
         </dependency>
+        <dependency>
+            <groupId>com.risingwave.java</groupId>
+            <artifactId>risingwave-sink-cassandra</artifactId>
+            <scope>provided</scope>
+        </dependency>
     </dependencies>
 </project>

java/connector-node/risingwave-connector-service/src/main/java/com/risingwave/connector/SinkUtils.java

@@ -43,6 +43,8 @@ public static SinkFactory getSinkFactory(String sinkName) {
                 return new DeltaLakeSinkFactory();
             case "elasticsearch-7":
                 return new EsSink7Factory();
+            case "cassandra":
+                return new CassandraFactory();
             default:
                 throw UNIMPLEMENTED
                         .withDescription("unknown sink type: " + sinkName)

java/connector-node/risingwave-connector-test/pom.xml

@@ -174,5 +174,10 @@
             <artifactId>risingwave-sink-es-7</artifactId>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.risingwave.java</groupId>
+            <artifactId>risingwave-sink-cassandra</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>

java/connector-node/risingwave-sink-cassandra/pom.xml

@@ -0,0 +1,60 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <parent>
+        <artifactId>java-parent</artifactId>
+        <groupId>com.risingwave.java</groupId>
+        <version>1.0-SNAPSHOT</version>
+        <relativePath>../../pom.xml</relativePath>
+    </parent>
+    <modelVersion>4.0.0</modelVersion>
+
+    <artifactId>risingwave-sink-cassandra</artifactId>
+    <version>1.0-SNAPSHOT</version>
+    <name>risingwave-sink-cassandra</name>
+
+    <dependencies>
+        <dependency>
+            <groupId>com.risingwave.java</groupId>
+            <artifactId>proto</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.risingwave.java</groupId>
+            <artifactId>connector-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-api</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-core</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-text</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-core</artifactId>
+            <version>${jackson.version}</version>
+        </dependency>
+
+        <!-- cassandra drivers -->
+        <dependency>
+            <groupId>com.datastax.oss</groupId>
+            <artifactId>java-driver-core</artifactId>
+            <version>${datastax.version}</version>
+        </dependency>
+    </dependencies>
+
+</project>

java/connector-node/risingwave-sink-cassandra/src/main/java/com/risingwave/connector/CassandraConfig.java

@@ -0,0 +1,95 @@
+/*
+ * Copyright 2023 RisingWave Labs
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.risingwave.connector;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.risingwave.connector.api.sink.CommonSinkConfig;
+
+public class CassandraConfig extends CommonSinkConfig {
+    /** Required */
+    private String type;
+    /** Required */
+    private String url;
+
+    /** Required */
+    private String keyspace;
+
+    /** Required */
+    private String table;
+
+    /** Required */
+    private String datacenter;
+
+    @JsonProperty(value = "cassandra.username")
+    private String username;
+
+    @JsonProperty(value = "cassandra.password")
+    private String password;
+
+    @JsonCreator
+    public CassandraConfig(
+            @JsonProperty(value = "cassandra.url") String url,
+            @JsonProperty(value = "cassandra.keyspace") String keyspace,
+            @JsonProperty(value = "cassandra.table") String table,
+            @JsonProperty(value = "cassandra.datacenter") String datacenter,
+            @JsonProperty(value = "type") String type) {
+        this.url = url;
+        this.keyspace = keyspace;
+        this.table = table;
+        this.datacenter = datacenter;
+        this.type = type;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public String getKeyspace() {
+        return keyspace;
+    }
+
+    public String getTable() {
+        return table;
+    }
+
+    public String getDatacenter() {
+        return datacenter;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public String getPassword() {
+        return password;
+    }
+
+    public CassandraConfig withUsername(String username) {
+        this.username = username;
+        return this;
+    }
+
+    public CassandraConfig withPassword(String password) {
+        this.password = password;
+        return this;
+    }
+}