apisix/doc/plugins/kafka-logger.md
2020-05-07 11:20:23 +08:00

4.6 KiB

Summary

Name

kafka-logger is a plugin which works as a Kafka client driver for the ngx_lua nginx module.

This will provide the ability to send Log data requests as JSON objects to external Kafka clusters.

This plugin provides the ability to push Log data as a batch to you're external Kafka topics. In case if you did not recieve the log data don't worry give it some time it will automatically send the logs after the timer function expires in our Batch Processor.

For more info on Batch-Processor in Apache APISIX please refer. Batch-Processor

Attributes

Name Requirement Description
broker_list required An array of Kafka brokers.
kafka_topic required Target topic to push data.
timeout optional Timeout for the upstream to send data.
async optional Boolean value to control whether to perform async push.
key required Key for the message.
name optional A unique identifier to identity the batch processor
batch_max_size optional Max size of each batch, default is 1000
inactive_timeout optional maximum age in seconds when the buffer will be flushed if inactive, default is 5s
buffer_duration optional Maximum age in seconds of the oldest entry in a batch before the batch must be processed, default is 5
max_retry_count optional Maximum number of retries before removing from the processing pipe line; default is zero
retry_delay optional Number of seconds the process execution should be delayed if the execution fails; default is 1

Info

Difference between async and the sync data push.

  1. In sync model

    In case of success, returns the offset (** cdata: LL **) of the current broker and partition. In case of errors, returns nil with a string describing the error.

  2. In async model

    The message will write to the buffer first. It will send to the kafka server when the buffer exceed the batch_num, or every flush_time flush the buffer.

    In case of success, returns true. In case of errors, returns nil with a string describing the error (buffer overflow).

Sample broker list

This plugin supports to push in to more than one broker at a time. Specify the brokers of the external kafka servers as below sample to take effect of this functionality.

{
    "127.0.0.1":9092,
    "127.0.0.1":9093
}

How To Enable

The following is an example on how to enable the kafka-logger for a specific route.

curl http://127.0.0.1:9080/apisix/admin/routes/5 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
{
    "plugins": {
       "kafka-logger": {
           "broker_list" :
             {
               "127.0.0.1":9092
             },
           "kafka_topic" : "test2",
           "key" : "key1",
           "batch_max_size": 1,
           "name": "kafka logger"
       }
    },
    "upstream": {
       "nodes": {
           "127.0.0.1:1980": 1
       },
       "type": "roundrobin"
    },
    "uri": "/hello"
}'

Test Plugin

  • success:
$ curl -i http://127.0.0.1:9080/hello
HTTP/1.1 200 OK
...
hello, world

Disable Plugin

Remove the corresponding json configuration in the plugin configuration to disable the kafka-logger. APISIX plugins are hot-reloaded, therefore no need to restart APISIX.

$ curl http://127.0.0.1:2379/apisix/admin/routes/1 -X PUT -d value='
{
    "methods": ["GET"],
    "uri": "/hello",
    "plugins": {},
    "upstream": {
        "type": "roundrobin",
        "nodes": {
            "127.0.0.1:1980": 1
        }
    }
}'