# Grab all feeder records in 3.0.1 **URL:** \ **Category:** Gatling (Open-Source)\ **Created:** [November 28, 2018, 9:56pm UTC](https://community.gatling.io/t/grab-all-feeder-records-in-3-0-1/4671 "2018-11-28T21:56:54Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![vu.nguyen](https://avatars.discourse-cdn.com/v4/letter/v/ba9def/32.png) [@vu.nguyen](https://community.gatling.io/u/vu.nguyen)\ **Post date:** [November 28, 2018, 9:56pm UTC](https://community.gatling.io/t/grab-all-feeder-records-in-3-0-1/4671/1 "2018-11-28T21:56:54Z")
Hi Stephane et team, While trying out our simulator with Gatling 3.0.1, we found another unexpected change in behavior of our feeders using readRecords: > **[Feeders](https://gatling.io/docs/current/session/feeder/#grabbing-records)** > > How to use feeders to inject test data into your virtual users' Session so that they don't all hit the same content and don't wrongfully test your caches. This is the definition of one of our feeders: ` val simDataTokens: Vector[Map[String, String]] = { try { csv(file). **readRecords**.as[Vector[Map[String, String]]] .zipWithIndex .withFilter(r =\> { r.\_1.contains(“name”) && r.\_1.contains(“token”) }) .map(r =\> { val id = r.\_2.toString val tokens = r.\_1 // DEBUG println("\>\>\> id: " + id + ", tokens: " + tokens) tokens + (“id” → id) }) } catch { case \_: Exception =\> Vector.empty } } // DEBUG println("\>\>\> simDataTokens records: " + simDataTokens.size) ` With Gatling 2.3.1 (using csv(file).\*\*records.\*\*toVector instead), simDataTokens returned three expected records and size = 3 with following debugging info: ` GATLING\_HOME is set to /home/gatling/2.3.1 > > > id: 0, tokens: Map(name → a, token → 1) > > > id: 1, tokens: Map(name → b, token → 2) > > > id: 2, tokens: Map(name → c, token → 3) > > > simDataTokens records: 3 10:49:44.179 [INFO] i.g.h.a.HttpEngine - Start warm up 10:49:44.287 [INFO] i.g.h.a.HttpEngine - Warm up done Simulation com.illumio.agentSimulation started… ` With Gatling 3.0.1, simDataTokens only returned the first record, and its size becomes 0. This is unexpected: ` GATLING\_HOME is set to /home/gatling/3.0.1 > > > id: 0, tokens: Map(name → a, token → 1) > > > simDataTokens records: 0 > > > Simulation com.illumio.agentSimulation started… ` Thank you for your help along the way. Vu ---
**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:** [November 28, 2018, 10:11pm UTC](https://community.gatling.io/t/grab-all-feeder-records-in-3-0-1/4671/2 "2018-11-28T22:11:05Z")
Nah, your code is broken: .withFilter(r =\> { r.\_1.contains(“name”) && r.\_1.contains(“token”) }) How do you expect r.\_1 to both contain “name” and “token”? 😛 ---
**Author:** ![vu.nguyen](https://avatars.discourse-cdn.com/v4/letter/v/ba9def/32.png) [@vu.nguyen](https://community.gatling.io/u/vu.nguyen)\ **Post date:** [November 28, 2018, 10:27pm UTC](https://community.gatling.io/t/grab-all-feeder-records-in-3-0-1/4671/3 "2018-11-28T22:27:15Z")
Because with zipWithIndex, r.\_1 is a Map[String, String] (which are the records from csv(file)). These codes have worked for us for years using Gatling 2.3.1 and Gatling 2.2.0. They only failed when we ran them with Gatling 3.0.1. (BTW, the debug outputs were generated earlier today). Vu ---
**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:** [November 28, 2018, 10:37pm UTC](https://community.gatling.io/t/grab-all-feeder-records-in-3-0-1/4671/4 "2018-11-28T22:37:05Z")
My2cents: there’s an exception and you don’t see it because you silently trap it and return Vector.empty, which looks very fishy to me. Have you checked the migration guide and how feeder file location resolution has changed (“data” folder is dropped)? ---
**Author:** ![vu.nguyen](https://avatars.discourse-cdn.com/v4/letter/v/ba9def/32.png) [@vu.nguyen](https://community.gatling.io/u/vu.nguyen)\ **Post date:** [November 28, 2018, 11:39pm UTC](https://community.gatling.io/t/grab-all-feeder-records-in-3-0-1/4671/5 "2018-11-28T23:39:56Z")
Much appreciation for Your2cents, Stephane. I repeated my experiment with following trimmed down feeder (with line number for reference): ` 200 val simDataTokens: Vector[Map[String, Any]] = { 201 csv(simTokens).readRecords.as[Vector[Map[String, String]]] 202 .zipWithIndex 203 .map(r =\> { 204 val id = r.\_2 205 val tokens = r.\_1 206 207 // DEBUG 208 println("\>\>\> id: " + id + “, tokens: " + tokens) 209 210 tokens + (“id” → id) 211 }) 212 } 213 214 println(”\>\>\> simDataTokens records: " + simDataTokens.size) ` And there was indeed an exception: ` GATLING\_HOME is set to /home/gatling/3.0.1 > > > id: 0, tokens: Map(name → a, token → 1) > > > 15:04:51.395 [ERROR] i.g.a.Gatling$ - Run crashed > > > java.lang.UnsupportedOperationException: null > > > at io.gatling.core.feeder.ArrayBasedMap.$plus(ArrayBasedMap.scala:28) > > > at io.gatling.core.feeder.ArrayBasedMap.$plus(ArrayBasedMap.scala:26) > > > at com.illumio.commonHeader$.$anonfun$simDataTokens$1(commonHeader.scala:210) > > > at scala.collection.TraversableLike.$anonfun$map$1(TraversableLike.scala:233) > > > at scala.collection.Iterator.foreach(Iterator.scala:937) > > > at scala.collection.Iterator.foreach$(Iterator.scala:937) > > > at scala.collection.AbstractIterator.foreach(Iterator.scala:1425) > > > at scala.collection.IterableLike.foreach(IterableLike.scala:70) > > > at scala.collection.IterableLike.foreach$(IterableLike.scala:69) > > > at scala.collection.AbstractIterable.foreach(Iterable.scala:54) > > > at scala.collection.TraversableLike.map(TraversableLike.scala:233) > > > at scala.collection.TraversableLike.map$(TraversableLike.scala:226) > > > at scala.collection.AbstractTraversable.map(Traversable.scala:104) > > > at com.illumio.commonHeader$.(commonHeader.scala:203) > > > at com.illumio.commonHeader$.(commonHeader.scala) > > > … 14 common frames omitted ` It appears the Map addition operation (tokens + (“id” → id)) is not supported? Any suggestion if that’s the case? > Thank you again, Stephane. Vu ---
**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:** [November 29, 2018, 12:14am UTC](https://community.gatling.io/t/grab-all-feeder-records-in-3-0-1/4671/6 "2018-11-29T00:14:44Z")
Our ArrayBasedMap doesn’t currently implement `+`, `-` and `updated` operations, simply because we don’t need them internally in Gatling and use cases such as yours are pretty exotic. Feel free to send a PR to implement them. ---
**Author:** ![vu.nguyen](https://avatars.discourse-cdn.com/v4/letter/v/ba9def/32.png) [@vu.nguyen](https://community.gatling.io/u/vu.nguyen)\ **Post date:** [November 29, 2018, 4:12am UTC](https://community.gatling.io/t/grab-all-feeder-records-in-3-0-1/4671/7 "2018-11-29T04:12:24Z")
[https://github.com/gatling/gatling/issues/3625](https://github.com/gatling/gatling/issues/3625) Thank you.