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Posted to users@kafka.apache.org by "Kyle.Hu" <Cr...@163.com> on 2018/08/01 11:52:48 UTC

A question about Kafka Stream API

Hi, bosses:
      I have read the word count demo of Kafka Stream API, it is cool that the Kafka Stream keeps the status, and I have a question about it, Weather it would cause memory problems when the keys accumulate a lot ?

Re: A question about Kafka Stream API

Posted by Damian Guy <da...@gmail.com>.

The count is stored in RocksDB which is persisted to disk. It is not
in-memory unless you specifically use an InMemoryStore.

On Wed, 1 Aug 2018 at 12:53 Kyle.Hu <Cr...@163.com> wrote:

> Hi, bosses:
>       I have read the word count demo of Kafka Stream API, it is cool that
> the Kafka Stream keeps the status, and I have a question about it, Weather
> it would cause memory problems when the keys accumulate a lot ?