[jira] [Resolved] (KAFKA-12893) MM2 fails to replicate if starting two+ nodes same time

["Chris Egerton (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/KAFKA-12893?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Chris Egerton resolved KAFKA-12893.
-----------------------------------
    Resolution: Duplicate

> MM2 fails to replicate if starting two+ nodes same time
> -------------------------------------------------------
>
>                 Key: KAFKA-12893
>                 URL: https://issues.apache.org/jira/browse/KAFKA-12893
>             Project: Kafka
>          Issue Type: Bug
>          Components: mirrormaker
>    Affects Versions: 2.8.0
>            Reporter: Tommi Vainikainen
>            Priority: Major
>
> I've observed a situation where starting more than one MM2 node in parallel, MM2 fails to start replication ie. replication flow seems to be stuck without action. I used exactly same mm2.properties file to start only one at a time, and the replication flow was proceeding smoothly.
> In my setup dc1 has topic "mytopic1" and there is a producer with approx 1 msg/sec, and I'm trying to repilcate this to dc2. What I observed is that dc1.mytopic1 is created when initially launching two paraller MM2 instances, but no messages gets written into the topic as I would expect. If I kill MM2 instances, and only start one MM2 node, then MM2 starts replicating the messages in mytopic1.
> My mm2.properties:
> clusters=dc2, dc1
> dc1->dc2.emit.heartbeats.enabled=true
> dc1->dc2.enabled=true
> dc1->dc2.sync.group.offsets.enabled=false
> dc1->dc2.sync.group.offsets.interval.seconds=45
> dc1->dc2.topics=mytopic1
> dc1->dc2.topics.exclude=
> dc1.bootstrap.servers=tvainika-dc1-dev-sandbox.aivencloud.com:12693
> dc1.security.protocol=SSL
> dc1.ssl.keystore.type=PKCS12
> dc1.ssl.keystore.location=dc1/client.keystore.p12
> dc1.ssl.keystore.password=secret
> dc1.ssl.key.password=secret
> dc1.ssl.truststore.location=dc1/client.truststore.jks
> dc1.ssl.truststore.password=secret
> dc2.bootstrap.servers=tvainika-dc2-dev-sandbox.aivencloud.com:12693
> dc2.security.protocol=SSL
> dc2.ssl.keystore.type=PKCS12
> dc2.ssl.keystore.location=dc2/client.keystore.p12
> dc2.ssl.keystore.password=secret
> dc2.ssl.key.password=secret
> dc2.ssl.truststore.location=dc2/client.truststore.jks
> dc2.ssl.truststore.password=secret
> tasks.max=3



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