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Update transactional producer docs #890

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Mar 9, 2022
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Update transactional producer docs #890

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5 changes: 5 additions & 0 deletions docs/src/main/mdoc/transactions.md
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Expand Up @@ -13,6 +13,11 @@ Kafka transactions are supported through a [`TransactionalKafkaProducer`][transa

- Create `CommittableProducerRecords` and wrap them in `TransactionalProducerRecords`.

> Note that calls to `produce` are sequenced in the `TransactionalKafkaProducer` to ensure that, when used concurrently, transactions don't run into each other resulting in an invalid transaction transition exception.
>
> Because the `TransactionalKafkaProducer` waits for the record batch to be flushed and the transaction committed on the broker, this could lead to performance bottlenecks where a single producer is shared among many threads.
> To ensure the performance of `TransactionalKafkaProducer` aligns with your performance expectations when used concurrently, it is recommended you create a pool of transactional producers.

Following is an example where transactions are used to consume, process, produce, and commit.

```scala mdoc
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