func newDataCollector(brokerList []string) sarama.SyncProducer {
// For the data collector, we are looking for strong consistency semantics.
// Because we don't change the flush settings, sarama will try to produce messages
// as fast as possible to keep latency low.
config := sarama.NewConfig()
config.Producer.RequiredAcks = sarama.WaitForAll // Wait for all in-sync replicas to ack the message
config.Producer.Retry.Max = 10 // Retry up to 10 times to produce the message
tlsConfig := createTlsConfiguration()
if tlsConfig != nil {
config.Net.TLS.Config = tlsConfig
config.Net.TLS.Enable = true
}
// On the broker side, you may want to change the following settings to get
// stronger consistency guarantees:
// - For your broker, set `unclean.leader.election.enable` to false
// - For the topic, you could increase `min.insync.replicas`.
producer, err := sarama.NewSyncProducer(brokerList, config)
if err != nil {
log.Fatalln("Failed to start Sarama producer:", err)
}
return producer
}
func newAccessLogProducer(brokerList []string) sarama.AsyncProducer {
// For the access log, we are looking for AP semantics, with high throughput.
// By creating batches of compressed messages, we reduce network I/O at a cost of more latency.
config := sarama.NewConfig()
tlsConfig := createTlsConfiguration()
if tlsConfig != nil {
config.Net.TLS.Enable = true
config.Net.TLS.Config = tlsConfig
}
config.Producer.RequiredAcks = sarama.WaitForLocal // Only wait for the leader to ack
config.Producer.Compression = sarama.CompressionSnappy // Compress messages
config.Producer.Flush.Frequency = 500 * time.Millisecond // Flush batches every 500ms
producer, err := sarama.NewAsyncProducer(brokerList, config)
if err != nil {
log.Fatalln("Failed to start Sarama producer:", err)
}
// We will just log to STDOUT if we're not able to produce messages.
// Note: messages will only be returned here after all retry attempts are exhausted.
go func() {
for err := range producer.Errors() {
log.Println("Failed to write access log entry:", err)
}
}()
return producer
}
func main() {
flag.Parse()
if *brokerList == "" {
printUsageErrorAndExit("no -brokers specified. Alternatively, set the KAFKA_PEERS environment variable")
}
if *topic == "" {
printUsageErrorAndExit("no -topic specified")
}
if *verbose {
sarama.Logger = logger
}
config := sarama.NewConfig()
config.Producer.RequiredAcks = sarama.WaitForAll
switch *partitioner {
case "":
if *partition >= 0 {
config.Producer.Partitioner = sarama.NewManualPartitioner
} else {
config.Producer.Partitioner = sarama.NewHashPartitioner
}
case "hash":
config.Producer.Partitioner = sarama.NewHashPartitioner
case "random":
config.Producer.Partitioner = sarama.NewRandomPartitioner
case "manual":
config.Producer.Partitioner = sarama.NewManualPartitioner
if *partition == -1 {
printUsageErrorAndExit("-partition is required when partitioning manually")
}
default:
printUsageErrorAndExit(fmt.Sprintf("Partitioner %s not supported.", *partitioner))
}
message := &sarama.ProducerMessage{Topic: *topic, Partition: int32(*partition)}
if *key != "" {
message.Key = sarama.StringEncoder(*key)
}
if *value != "" {
message.Value = sarama.StringEncoder(*value)
} else if stdinAvailable() {
bytes, err := ioutil.ReadAll(os.Stdin)
if err != nil {
printErrorAndExit(66, "Failed to read data from the standard input: %s", err)
}
message.Value = sarama.ByteEncoder(bytes)
} else {
printUsageErrorAndExit("-value is required, or you have to provide the value on stdin")
}
producer, err := sarama.NewSyncProducer(strings.Split(*brokerList, ","), config)
if err != nil {
printErrorAndExit(69, "Failed to open Kafka producer: %s", err)
}
defer func() {
if err := producer.Close(); err != nil {
logger.Println("Failed to close Kafka producer cleanly:", err)
}
}()
partition, offset, err := producer.SendMessage(message)
if err != nil {
printErrorAndExit(69, "Failed to produce message: %s", err)
} else if !*silent {
fmt.Printf("topic=%s\tpartition=%d\toffset=%d\n", *topic, partition, offset)
}
}