Spark applications must be configured with a set of Kafka topics that are either shared between multiple applications or dedicated to specific applications. The assigned topics must be created before you submit an application to the Spark cluster. Before you can create the topics you must start Zookeeper and Kafka.
Starting Services
The prerequisites for starting services are the following:
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Spark, ZooKeeper and Kafka are installed and up and running.
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Prerequisites:
Prepare scripts according to Preparing and Creating Scripts for KPI Management
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Starting
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. Startup Spark cluster:
$ start_master_workers.sh ...
. Submit the app: $ submit.sh kpiapp ...
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Spark UI
Creating Kafka Topics
Clusters
To start a cluster follow the steps:
Start Zookeeper and Kafka
To start Zookeeper, run the following:bin/zookeeper-server-start.sh config/zookeeper.properties
To start Kafka, run:bin/kafka-server-start.sh config/server.propertiesCreate Kafka topics and partitions using the scripts included in the Kafka installation.
The names of the topics must correspond to the Spark application configuration.
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In order for the Spark KPI Application to work, the required number of partitions for each topic must be equal to the setting of the property |
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$ ./bin/kafka-topics.sh --create --topic <input topic> --bootstrap-server \ localhost:9092 --partitions <number of partitions> --replication-factor <number of replicas> $ ./bin/kafka-topics.sh --create --topic <output topic> --bootstrap-server \ localhost:9092 --partitions <number of partitions> --replication-factor <number of replicas> $ ./bin/kafka-topics.sh --create --topic <alarm topic> --bootstrap-server \ localhost:9092 --partitions <number of partitions> --replication-factor <number of replicas> |
Example - Creating Kafka Topics
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./bin/kafka-topics.sh --create --topic kpi-output --partitions 6 --replication-factor 1 ./bin/kafka-topics.sh --create --topic kpi-input --partitions 6 --replication-factor 1 ./bin/kafka-topics.sh --create --topic kpi-alarm --partitions 6 --replication-factor 1 |
Example - Creating Kafka topics, overriding retention settings
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./bin/kafka-topics.sh --create --topic kpi-output --partitions 6 --replication-factor 1 --config retention.ms=86400000 ./bin/kafka-topics.sh --create --topic kpi-input --partitions 6 --replication-factor 1 --config retention.ms=86400000 ./bin/kafka-topics.sh --create --topic kpi-alarm --partitions 6 --replication-factor 1 --config retention.ms=86400000 |
Run the following command to start Spark:
$ start_master_workers.sh ...
To submit the app to the Spark cluster. Submit the app:$ submit.sh kpiapp ...You can now confirm the status of the Spark cluster. Open a browser and go to
http://<master host>:8080.
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Spark UI