Re: Message order different each time stream is replayed?

[Apurva Mehta <ap...@confluent.io>]

How many partitions do you have in that topic. Kafka only guarantees a
total ordering of messages within a partition, not across partitions of a
topic. If you want total ordering over the entire topic, you need to create
a topic with a single partition.

On Wed, Nov 30, 2016 at 4:10 AM, Ali Akhtar <al...@gmail.com> wrote:

> While I was connected to console-consumer.sh, I posted a few messages to a
> Kafka topic, one message at a time, across a few hours.
>
> I'd post a message, see it arrive in console-consumer, a few mins later I'd
> post the next message, and so on.
>
> They all arrived in order.
>
> However, when I now try to view console-consumer.sh --from-beginning, each
> time I do so, the messages seem to be shown in a shuffled order.
>
> Also the last 2 messages appear to be missing, although its possible I
> didn't see them in the shuffled output (the topic has over 10k messages
> total which are all dumped to console when I view).
>
> Is this just due to network lag when viewing console-consumer, or should I
> expect my actual consumers to also receive messages out of order each time
> they replay a topic?
>

Re: Message order different each time stream is replayed?

[Ali Akhtar <al...@gmail.com>]

Ah, That explains it. I have 3 partitions.

On 1 Dec 2016 5:42 a.m., "Apurva Mehta" <ap...@confluent.io> wrote:

How many partitions do you have in that topic. Kafka only guarantees a
total ordering of messages within a partition, not across partitions of a
topic. If you want total ordering over the entire topic, you need to create
a topic with a single partition.

On Wed, Nov 30, 2016 at 4:10 AM, Ali Akhtar <al...@gmail.com> wrote:

> While I was connected to console-consumer.sh, I posted a few messages to a
> Kafka topic, one message at a time, across a few hours.
>
> I'd post a message, see it arrive in console-consumer, a few mins later
I'd
> post the next message, and so on.
>
> They all arrived in order.
>
> However, when I now try to view console-consumer.sh --from-beginning, each
> time I do so, the messages seem to be shown in a shuffled order.
>
> Also the last 2 messages appear to be missing, although its possible I
> didn't see them in the shuffled output (the topic has over 10k messages
> total which are all dumped to console when I view).
>
> Is this just due to network lag when viewing console-consumer, or should I
> expect my actual consumers to also receive messages out of order each time
> they replay a topic?
>