.github, txn docs: use Kafka 3.6, avoid KAFKA-15653, doc deprecated o…

…ption

.github/workflows/lint-and-test.yml

@@ -34,10 +34,10 @@ jobs:
     needs: golangci
     runs-on: ubuntu-latest
     name: "integration test kafka"
-    container: golang:1.20.3
+    container: golang:1.21.3
     services:
       kafka:
-        image: bitnami/kafka:3.5
+        image: bitnami/kafka:latest
         ports:
           - 9092:9092
         env:
@@ -47,6 +47,7 @@ jobs:
           KAFKA_CFG_LISTENERS: PLAINTEXT://:9092,CONTROLLER://:9093
           KAFKA_CFG_LISTENER_SECURITY_PROTOCOL_MAP: CONTROLLER:PLAINTEXT,PLAINTEXT:PLAINTEXT
           KAFKA_CFG_CONTROLLER_QUORUM_VOTERS: [email protected]:9093
+          KAFKA_CFG_TRANSACTION_PARTITION_VERIFICATION_ENABLE: false
           # Set this to "PLAINTEXT://127.0.0.1:9092" if you want to run this container on localhost via Docker
           KAFKA_CFG_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092
           KAFKA_CFG_NODE_ID: 1
@@ -58,7 +59,6 @@ jobs:
         env:
           KGO_TEST_RF: 1
           KGO_SEEDS: kafka:9092
-          KGO_TEST_UNSAFE: true
           KGO_TEST_STABLE_FETCH: true
 
   integration-test-redpanda:

pkg/kgo/txn.go

@@ -511,6 +511,14 @@ const (
 	// This relies on Kafka internals. Some brokers (notably Redpanda) are
 	// more strict with enforcing transaction correctness and this option
 	// cannot be used and will cause errors.
+	//
+	// Deprecated: Kafka 3.6 removed support for the hacky behavior that
+	// this option was abusing. Thus, as of Kafka 3.6, this option does not
+	// work against Kafka. This option also has never worked for Redpanda
+	// becuse Redpanda always strictly validated that partitions were a
+	// part of a transaction. Later versions of Kafka and Redpanda will
+	// remove the need for AddPartitionsToTxn at all and thus this option
+	// ultimately will be unnecessary anyway.
 	EndBeginTxnUnsafe
 )