# Apm server publishing data to single kakfa topic partition **URL:** \ **Category:** APM\ **Tags:** server\ **Created:** [September 11, 2019, 5:23pm UTC](https://discuss.elastic.co/t/apm-server-publishing-data-to-single-kakfa-topic-partition/199113 "2019-09-11T17:23:00Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Vishnu\_Singhal](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vishnu_singhal/32/52488_2.png) [@Vishnu\_Singhal](https://discuss.elastic.co/u/Vishnu_Singhal)\ **Post date:** [September 11, 2019, 5:23pm UTC](https://discuss.elastic.co/t/apm-server-publishing-data-to-single-kakfa-topic-partition/199113/1 "2019-09-11T17:23:00Z")
If you are asking about a problem you are experiencing, please use the following template, as it will help us help you. If you have a different problem, please delete all of this text 🙂 **Kibana version** :NA **Elasticsearch version** : NA **APM Server version** : 7.1.2 **APM Agent language and version** : Java **Browser version** : NA **Original install method (e.g. download page, yum, deb, from source, etc.) and version**: docker **Fresh install or upgraded from other version?** NA **Is there anything special in your setup?** For example, are you using the Logstash or Kafka outputs? using kafka output **Description of the problem including expected versus actual behavior. Please include screenshots (if relevant)**: I have enabled data publishing of transaction, span , beat on kafka. But problem is it is publishing all data to single kafka topic partition. It should be publishing to different partitions. **Steps to reproduce** : 1. Enabled kafka output. 2.Did following configuration in apm-server.yaml 2. **Errors in browser console (if relevant)**: NA **Provide logs and/or server output (if relevant)**: output.kafka: enabled: true hosts: ["kafka:9092"] topic: '%{[processor.event]}' key: '%{[transaction.id]}' How can i publish on different partitions of the kafka topic, so that its distributed ? ---
**Author:** ![Vishnu\_Singhal](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vishnu_singhal/32/52488_2.png) [@Vishnu\_Singhal](https://discuss.elastic.co/u/Vishnu_Singhal)\ **Post date:** [September 11, 2019, 5:45pm UTC](https://discuss.elastic.co/t/apm-server-publishing-data-to-single-kakfa-topic-partition/199113/2 "2019-09-11T17:45:02Z")
what does reachable\_only does? somewhat not clear with difference in true/false ---
**Author:** ![jalvz](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jalvz/32/45613_2.png) [@jalvz](https://discuss.elastic.co/u/jalvz)\ **Post date:** [September 12, 2019, 6:49am UTC](https://discuss.elastic.co/t/apm-server-publishing-data-to-single-kakfa-topic-partition/199113/3 "2019-09-12T06:49:12Z")
Hi! You can find the answer in the official docs: [https://www.elastic.co/guide/en/apm/server/current/kafka-output.html#topics-option-kafka](https://www.elastic.co/guide/en/apm/server/current/kafka-output.html#topics-option-kafka) `reachable_only` will cause unavailable partitions to be skipped. ---
**Author:** ![Vishnu\_Singhal](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vishnu_singhal/32/52488_2.png) [@Vishnu\_Singhal](https://discuss.elastic.co/u/Vishnu_Singhal)\ **Post date:** [September 20, 2019, 3:03pm UTC](https://discuss.elastic.co/t/apm-server-publishing-data-to-single-kakfa-topic-partition/199113/4 "2019-09-20T15:03:52Z")
I have enabled the same but still transaction and spans are published only in 0th partition . output.kafka: enabled: true hosts: ["kafka:9092"] topic: '%{[processor.event]}' key: '%{[transaction.id]}' partition.round\_robin: reachable\_only: true ---
**Author:** ![jalvz](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jalvz/32/45613_2.png) [@jalvz](https://discuss.elastic.co/u/jalvz)\ **Post date:** [September 23, 2019, 7:40am UTC](https://discuss.elastic.co/t/apm-server-publishing-data-to-single-kakfa-topic-partition/199113/5 "2019-09-23T07:40:53Z")
Hi, you need a `topics` attribute as described in the docs, not simply `topic`. Does that makes sense? ---
**Author:** ![Vishnu\_Singhal](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/vishnu_singhal/32/52488_2.png) [@Vishnu\_Singhal](https://discuss.elastic.co/u/Vishnu_Singhal)\ **Post date:** [September 23, 2019, 2:28pm UTC](https://discuss.elastic.co/t/apm-server-publishing-data-to-single-kakfa-topic-partition/199113/6 "2019-09-23T14:28:54Z")
I'm only using transactions and span ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [October 14, 2019, 10:28am UTC](https://discuss.elastic.co/t/apm-server-publishing-data-to-single-kakfa-topic-partition/199113/7 "2019-10-14T10:28:58Z")
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