Logstash consumes persistent queue size when no events stored

Elastic Stack Logstash
1

Hi,
We are using persistent queue in Logstash to store the events when output is blocked. Please refer to the following configuration.

- pipeline.id: syslog
  queue.type: persisted
  queue.max_bytes: 128mb
  path.config: "/opt/logstash/resource/syslog_output.conf"

We observed Logstash is consuming queue_size_in_bytes even when there are no events stored in the queue.

 "queue" : {
        "type" : "persisted",
        "capacity" : {
          "page_capacity_in_bytes" : 67108864,
          "max_queue_size_in_bytes" : 134217728,
          "max_unread_events" : 0,
          "queue_size_in_bytes" : 16113344
        },
        "data" : {
          "free_space_in_bytes" : 48755580928,
          "path" : "/opt/logstash/data/queue/syslog",
          "storage_type" : "xfs"
        },
        "events" : 0,
        "events_count" : 0,
        "queue_size_in_bytes" : 16113344,
        "max_queue_size_in_bytes" : 134217728
      },

Could you please help to understand why Logstash consuming queue_size_in_bytes when no events stored in the queue.

2

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