batch-processor.md

title
Batch Processor

The batch processor can be used to aggregate entries(logs/any data) and process them in a batch. When the batch_max_size is set to zero the processor will execute each entry immediately. Setting the batch max size more than 1 will start aggregating the entries until it reaches the max size or the timeout expires.

Configurations

The only mandatory parameter to create a batch processor is a function. The function will be executed when the batch reaches the max size or when the buffer duration exceeds.

Name	Requirement	Description
id	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

The following code shows an example of how to use a batch processor. The batch processor takes a function to be executed as the first argument and the batch configuration as the second parameter.

local bp = require("apisix.plugins.batch-processor")
local func_to_execute = function(entries)
            -- serialize to json array core.json.encode(entries)
            -- process/send data
            return true
       end

local config = {
    max_retry_count  = 2,
    buffer_duration  = 60,
    inactive_timeout  = 5,
    batch_max_size = 1,
    retry_delay  = 0
}


local batch_processor, err = bp:new(func_to_execute, config)

if batch_processor then
    batch_processor:push({hello='world'})
end

Note: Please make sure the batch max size (entry count) is within the limits of the function execution. The timer to flush the batch runs based on the inactive_timeout configuration. Thus, for optimal usage, keep the inactive_timeout smaller than the buffer_duration.