Hi all, me and my team are trying to setup sticky bucketing using the Java/Kotlin SDK but are having a hard time doing it. Can anyone assist? This is our current implementation (we are testing it locally trying to observe what happens to the same user id when using stickybucketing vs. when not).

val trackingCallback = object : TrackingCallback {
    override fun <ValueType : Any?> onTrack(
        experiment: Experiment<ValueType?>,
        experimentResult: ExperimentResult<ValueType?>,
    ) {
        println("[TrackingCallback] Experiment is: $experiment")
        println("[TrackingCallback] ExperimentResult is: ${experimentResult.toJson()}")
    }
}

val stickyBucketService = object : StickyBucketService {
    override fun getAssignments(
        attributeName: String?,
        attributeValue: String?,
    ): StickyAssignmentsDocument? {
        println("[StickyBucketService] Getting assignments")
        return StickyAssignmentsDocument(
            "id",
            "b0c7f2f4-7575-4c31-88b2-823d2c88484f",
            mapOf("test__0" to "0"),
        )
    }

    override fun saveAssignments(doc: StickyAssignmentsDocument?) {
        println("[StickyBucketService] Saving assignments $doc")
    }

    override fun getAllAssignments(attributes: Map<String?, String?>?): Map<String?, StickyAssignmentsDocument?>? {
        println("[StickyBucketService] Getting all assignments")
        return null
    }
}

fun main() {
    val featuresRepository = GBFeaturesRepository
        .builder()
        .apiHost("MY_HOST")
        .clientKey("MY_CLIENT_KEY")
        .refreshStrategy(FeatureRefreshStrategy.STALE_WHILE_REVALIDATE)
        .build()
        .apply {
            initialize()
        }
    val ctx = GBContext
        .builder()
        .featuresJson(featuresRepository.featuresJson)
        .attributesJson(
            """
                {
                    "id": "b0c7f2f4-7575-4c31-88b2-823d2c88484f"
                }
            """.trimIndent(),
        )
        .trackingCallback(trackingCallback)
        .enabled(true)
        .isQaMode(false)
        .stickyBucketService(stickyBucketService)
        .build()
    val gb = GrowthBook(ctx)
    val result = gb.getFeatureValue("test", "error")
    println("Result is: $result")
}

@freezing-postman-69602 Can you offer any help here?

Heyy.. the code you shared, especially the custom

stickyBucketService

needs some help.

getAllAssignments

returns null and

saveAssignments

doesn't do anything and

getAssignments

returns sort of a hard coded value regardless of the

attr

value or name.

Hello @freezing-postman-69602, thank you for your help. We are still debugging the sdk in order to get to know to make things work, and the point is both get methods are not being called. Whatever we return in both methods. The fact is they are not being called

I hope you've fixed the stickyBucketService and set the

stickyBucketIdentifierAttributes

. Do you mind sharing more about: 1. What does your feature "test" look like in the GrowthBook dashboard? What are the rules? 2. What's the targeting condition? I'm happy to collab w/ you to dig more into this.

I am going to undo my POC to Java and test it again. I swapped to the Kotlin SDK - btw I left a message in the channel about it - and it does not have the

stickyBucketIdentifierAttributes

api. @nutritious-garden-91325 can you please share what Madhu is asking, please?

Hi @freezing-postman-69602. Thanks for the help. This is the current flag rules in growthbook. Is not targeting a specific audience. Is a single a/b test that is supposed to show to 100% of users. Don't know if it matters, but this experiment was first set up with a 50/50 split and then I changed the configuration to 99/1 split. We are trying to force a scenario where the user would flip to another variant so we can test exactly how stickybucketing works.

"features":{"test":{"defaultValue":"NOT IN EXPERIMENT","rules":[{"id":"fr_4gtibomdqbr94v","coverage":1,"hashAttribute":"id","bucketVersion":1,"seed":"3a7577e0-eb80-4a14-863f-f29db9fea0c7","hashVersion":2,"variations":["OFF","ON"],"weights":[0.99,0.01],"key":"test","meta":[{"key":"0","name":"Control"},{"key":"1","name":"Variation 1"}],"phase":"2","name":"test-2"}]}