[jira] [Created] (KAFKA-3848) Mirror Maker sometimes fails to mirror first batch of messages

["James Clarke (JIRA)" <ji...@apache.org>]

James Clarke created KAFKA-3848:
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             Summary: Mirror Maker sometimes fails to mirror first batch of messages
                 Key: KAFKA-3848
                 URL: https://issues.apache.org/jira/browse/KAFKA-3848
             Project: Kafka
          Issue Type: Bug
    Affects Versions: 0.10.0.0, 0.9.0.1
            Reporter: James Clarke


I am seeing an intermittent issue in Mirror Maker where the first batch of messages are not always mirrored to the target cluster. All messages after the first batch are mirrored.

I have a github repo ([jc/kafka-mirror-maker-test|https://github.com/jc/kafka-mirror-maker-test]) which reproduces the issue using Confluent's docker containers (running 0.10.0). However on our environment we are using our own kafka containers running 0.9.0.1.

Environment:

- edge datacenter dc1. 1 zk server, 1 kafka server.
- aggregate datacenter dc2. 1 zk server, 1 kafka server, 1 mirror maker.
- kafka server setup to auto create topics
- Mirrror maker configured mirror from dc1 to dc2 using a whitelist containing both explicitly topics and regex topics.

Steps to reproduce:

- Send message to a non-existent topic in dc1.
- Send a second message to topic in dc1.

Observed:

- After first message the topic is not created in dc2.
- After second message topic is present in dc2.
- Consuming from topic in dc1 shows both messages.
- Consuming from topic in dc2 shows only the second message.



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