# Fingerprint filter concatenate\_all\_fields vs concatenate\_sources

**URL:** <https://discuss.elastic.co/t/fingerprint-filter-concatenate-all-fields-vs-concatenate-sources/320318>\
**Category:** Logstash\
**Created:** [December 2, 2022, 4:13am UTC](https://discuss.elastic.co/t/fingerprint-filter-concatenate-all-fields-vs-concatenate-sources/320318 "2022-12-02T04:13:33Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![mikhatanu](https://avatars.discourse-cdn.com/v4/letter/m/ba8739/32.png) [@mikhatanu](https://discuss.elastic.co/u/mikhatanu)\
**Post date:** [December 2, 2022, 4:13am UTC](https://discuss.elastic.co/t/fingerprint-filter-concatenate-all-fields-vs-concatenate-sources/320318/1 "2022-12-02T04:13:33Z")

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Hello, does concatenate\_sources only concat field in the source option and concatenate\_all\_fields concat all the fields from the input, e.g.: i have a log with a,b,c,d,e fields.

If i use this,

```auto
fingerprint{
    concatenate_sources => "true"
    method => "MURMUR3_128"
    source => ["a","b"]
    target => "fingerprint"
  }

```

the fingerprint will use the concat of a and b only. But if I use this

```auto
fingerprint{
    concatenate_all_fields => "true"
    method => "MURMUR3_128"
    source => ["a","b"]
    target => "fingerprint"
  }

```

the fingerprint will use the concat of a, b, c, d, and e?

---

<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [December 2, 2022, 4:44pm UTC](https://discuss.elastic.co/t/fingerprint-filter-concatenate-all-fields-vs-concatenate-sources/320318/2 "2022-12-02T16:44:15Z")

</div>

If you look at the [code](https://github.com/logstash-plugins/logstash-filter-fingerprint/blob/683d0b7888cca68c973ebf982128214c355d8913/lib/logstash/filters/fingerprint.rb#L156) you will see that if concatenate\_all\_fields is set then source is ignored.

---

<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:** [December 30, 2022, 4:44pm UTC](https://discuss.elastic.co/t/fingerprint-filter-concatenate-all-fields-vs-concatenate-sources/320318/3 "2022-12-30T16:44:25Z")

</div>

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