fix(ksql-driver): Kafka, list of brokers (#9009)

Author: RusovDmitriy

packages/cubejs-ksql-driver/src/KsqlDriver.ts

@@ -131,7 +131,9 @@ export class KsqlDriver extends BaseDriver implements DriverInterface {
     if (this.config.kafkaHost) {
       this.kafkaClient = new Kafka({
         clientId: 'Cube',
-        brokers: [this.config.kafkaHost],
+        brokers: this.config.kafkaHost
+          .split(',')
+          .map(h => h.trim()),
         // authenticationTimeout: 10000,
         // reauthenticationThreshold: 10000,
         ssl: this.config.kafkaUseSsl,

rust/cubestore/cubestore/src/streaming/kafka.rs

@@ -306,6 +306,13 @@ impl StreamingSource for KafkaStreamingSource {
         let unique_key_columns = self.unique_key_columns.clone();
         let seq_column_index_to_move = self.seq_column_index;
         let traffic_sender = TrafficSender::new(self.trace_obj.clone());
+        let hosts = self
+            .host
+            .clone()
+            .split(",")
+            .filter(|s| !s.is_empty())
+            .map(|s| s.trim().to_string())
+            .collect();
         let stream = self
             .kafka_client
             .create_message_stream(
@@ -321,7 +328,7 @@ impl StreamingSource for KafkaStreamingSource {
                         })
                         .unwrap_or(Offset::End),
                 ),
-                vec![self.host.clone()],
+                hosts,
                 &self.user,
                 &self.password,
                 self.use_ssl,