Logstash Opening file only on quit

[wheelq (Mike W)]

Very strange thing is happening.
Logstash is being launched with the following command:

logstash -f /tmp/my_config.yml
sincedb_path -> set to /dev/null

Input file is being generated- nothing happens.
Input file is being modified- nothing happens
I manually modify file- nothing happens

BUT, when I press CTRL+C I get the following info:

observingtail - QUIT 0 closing all files and shutting down.
[...]
file - Opening file {:path => "/tmp/input.json.log"} . <-- this is my log file defined in the YML..
aaaand then the data is being read and saved to the ES node....

Any ideas?

[wheelq (Mike W)]

Fixed. Resolved as a part of another issue: The shutdown process appears to be stalled due to busy or blocked plugins