Summary

Name
Attributes
Info
How To Enable
Test Plugin
Disable Plugin

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.

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.

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.
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
        }
    }
}'

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