# Logstash CSV output opening/closing file bottleneck

**URL:** <https://discuss.elastic.co/t/logstash-csv-output-opening-closing-file-bottleneck/294446>\
**Category:** Logstash\
**Created:** [January 14, 2022, 8:41pm UTC](https://discuss.elastic.co/t/logstash-csv-output-opening-closing-file-bottleneck/294446 "2022-01-14T20:41:48Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![tkirui](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/tkirui/32/100344_2.png) [@tkirui](https://discuss.elastic.co/u/tkirui)\
**Post date:** [January 14, 2022, 8:41pm UTC](https://discuss.elastic.co/t/logstash-csv-output-opening-closing-file-bottleneck/294446/1 "2022-01-14T20:41:48Z")

</div>

I am running logstash to parse many files with output to a single CSV file. This is working ok but is taking long with the bottleneck being the opening file/closing file. Im i missing something? Any faster way of doin this?

Input as below;

```auto
input {

    file {

    path =>"C:/ELK/LOGS/LX/dec/*.txt"

    start_position =>"beginning"

    sincedb_path=>"NUL"

                     

    }

}

```

Output,

```auto
output {

   

    csv {

        fields => ["timestamp","field1","field 2","field 3","field4"]

        path => "C:/ELK/LOGS/LX/file.csv"

        

    }

}

```

When i run the logstash, you can see the time stamps of the opening file/closing file

```auto
[2022-01-15T04:26:06,342][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Closing file C:/ELK/LOGS/LX/file.csv
[2022-01-15T04:26:14,563][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Opening file {:path=>"C:/ELK/LOGS/LX/file.csv"}
[2022-01-15T04:29:08,517][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Closing file C:/ELK/LOGS/LX/file.csv
[2022-01-15T04:29:11,458][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Opening file {:path=>"C:/ELK/LOGS/LX/file.csv"}
[2022-01-15T04:30:22,281][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Closing file C:/ELK/LOGS/LX/file.csv
[2022-01-15T04:30:29,816][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Opening file {:path=>"C:/ELK/LOGS/LX/file.csv"}
[2022-01-15T04:31:03,544][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Closing file C:/ELK/LOGS/LX/file.csv
[2022-01-15T04:31:08,105][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Opening file {:path=>"C:/ELK/LOGS/LX/file.csv"}
[2022-01-15T04:33:11,831][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Closing file C:/ELK/LOGS/LX/file.csv
[2022-01-15T04:34:57,481][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Opening file {:path=>"C:/ELK/LOGS/LX/file.csv"}
[2022-01-15T04:36:01,097][INFO][logstash.outputs.csv][main][62c6c42308330edea714c856c9da89029681556c2a28c1ae2345c8063277abcc] Closing file C:/ELK/LOGS/LX/file.csv}

```

Any way to make this more efficient?

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [February 11, 2022, 8:42pm UTC](https://discuss.elastic.co/t/logstash-csv-output-opening-closing-file-bottleneck/294446/2 "2022-02-11T20:42:22Z")

</div>

This topic was automatically closed 28 days after the last reply. New replies are no longer allowed.