# Modify feeder during load test is running

**URL:** <https://community.gatling.io/t/modify-feeder-during-load-test-is-running/5954>\
**Category:** Gatling (Open-Source)\
**Created:** [January 7, 2021, 6:32am UTC](https://community.gatling.io/t/modify-feeder-during-load-test-is-running/5954 "2021-01-07T06:32:14Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Travis\_Nguyen](https://avatars.discourse-cdn.com/v4/letter/t/a88e4f/32.png) [@Travis\_Nguyen](https://community.gatling.io/u/Travis_Nguyen)\
**Post date:** [January 7, 2021, 6:32am UTC](https://community.gatling.io/t/modify-feeder-during-load-test-is-running/5954/1 "2021-01-07T06:32:14Z")

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Hi Gatling team,

I want to setup two scenarios as below:

S1: requesters post a lot of new records.

S2. assessors load new records and make some changes.

S1 will produce a lot of id from HTTP response, and I want to feed that seq of id into feeder for S2. Does Gatling has API for this purpose?

Thanks,  
Ben

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**Author:** ![slandelle](https://dub1.discourse-cdn.com/flex013/user_avatar/community.gatling.io/slandelle/32/4_2.png) [@slandelle](https://community.gatling.io/u/slandelle)\
**Post date:** [January 7, 2021, 8:02am UTC](https://community.gatling.io/t/modify-feeder-during-load-test-is-running/5954/2 "2021-01-07T08:02:29Z")

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As explained in the [documentation](https://gatling.io/docs/current/session/feeder/), Feeder is just an Iterator, so you can bring your own implementation: eg an Iterator backed by a ConcurrentLinkedQueue where you would offer and pull records. Beware of S2 going faster than S1 though.