process_partial_cri error="undefined method `split' for nil:NilClass"

[karthiknagraj]

Problem

Hi, I am seeing the below log in my fluentd container

2023-02-17 11:40:02 +0000 [warn]: #0 send an error event to @ERROR: error_class=NoMethodError error="undefined method `split' for nil:NilClass" location="/usr/local/lib/ruby/gems/2.7.0/gems/fluent-plugin-concat-2.5.0/lib/fluent/plugin/filter_concat.rb:286:in `process_partial_cri'" tag="kube.kube-system" time=2023-02-17 11:40:00.745388030 +0000

...

Steps to replicate

Provide example config and message

Expected Behavior

...

Your environment

• paste result of fluentd --version or td-agent --version

root [ / ]# fluentd --version
fluentd 1.13.3

• plugin version - 2.5.0
  Gemfile.lock.txt

[daipom]

That message means nil record was passed to this plugin.
The record data may have been broken in the process somewhere before this plugin process.

A similar problem is confirmed: fluent/fluentd#3970

It is confirmed when transferring data between 2 Fluentd, Forwarder(out_forward) and Aggregator(in_forward).
When a power failure occurs at Forwarder, some buffer files can be broken, and broken data are transferred.

[daipom]

Please reopen this if you need.