# Kafka Consumer Input Plugin

The [Kafka](http://kafka.apache.org/) consumer plugin polls a specified Kafka
topic and adds messages to InfluxDB. The plugin assumes messages follow the
line protocol. [Consumer Group](http://godoc.org/github.com/wvanbergen/kafka/consumergroup)
is used to talk to the Kafka cluster so multiple instances of telegraf can read
from the same topic in parallel.

For old kafka version (< 0.8), please use the kafka_consumer_legacy input plugin
and use the old zookeeper connection method.

## Configuration

```toml
# Read metrics from Kafka topic(s)
[[inputs.kafka_consumer]]
  ## kafka servers
  brokers = ["localhost:9092"]
  ## topic(s) to consume
  topics = ["telegraf"]

  ## Optional Client id
  # client_id = "Telegraf"

  ## Set the minimal supported Kafka version.  Setting this enables the use of new
  ## Kafka features and APIs.  Of particular interest, lz4 compression
  ## requires at least version 0.10.0.0.
  ##   ex: version = "1.1.0"
  # version = ""

  ## Optional TLS Config
  # tls_ca = "/etc/telegraf/ca.pem"
  # tls_cert = "/etc/telegraf/cert.pem"
  # tls_key = "/etc/telegraf/key.pem"
  ## Use TLS but skip chain & host verification
  # insecure_skip_verify = false

  ## Optional SASL Config
  # sasl_username = "kafka"
  # sasl_password = "secret"

  ## the name of the consumer group
  consumer_group = "telegraf_metrics_consumers"
  ## Offset (must be either "oldest" or "newest")
  offset = "oldest"

  ## Data format to consume.
  ## Each data format has its own unique set of configuration options, read
  ## more about them here:
  ## https://github.com/influxdata/telegraf/blob/master/docs/DATA_FORMATS_INPUT.md
  data_format = "influx"

  ## Maximum length of a message to consume, in bytes (default 0/unlimited);
  ## larger messages are dropped
  max_message_len = 1000000
```

## Testing

Running integration tests requires running Zookeeper & Kafka. See Makefile
for kafka container command.