Created a bug:

On Wed, Oct 5, 2016 at 12:34 PM, Juho Autio <> wrote:

> Does anyone know about this? Altering topic partitions seems to reset
> consumer offsets.
> On Tue, Sep 27, 2016 at 1:28 PM, Juho Autio <> wrote:
>> I increased partitions for one existing topic (2->10), but was surprised
>> to see that it entirely reset the committed offsets of my consumer group.
>> All topics & partitions were reset to the earliest offset available, and
>> the consumer read everything again.
>> Documentation doesn't mention anything like this. Is this how it's
>> supposed to work, or a bug?
>> I would've expected the consumer offsets to not decrease at all,
>> especially for the topics that I didn't even touch.
>> For the altered topic I would've expected that consuming the previously
>> existing partitions 0 and 1 would've continued from the position where they
>> were, and naturally starting to read the new added partitions from 0.
>> I added partitions according to the "Modifying topics" section of Kafka
>> 0.10.0 Documentation:
>> "To add partitions you can do
>>  > bin/ --zookeeper $ZOOKEEPER_HOST --alter --topic
>> altered_topic --partitions 10
>> "
>> Previously this topic had 2 partitions.
>> For the consumer I'm using:
>> kafka.javaapi.consumer.ConsumerConnector.createMessageStreamsByFilter()
>> And version is:
>> <groupId>org.apache.kafka</groupId>
>> <artifactId>kafka_2.11</artifactId>
>> <version></version>
>> Kafka cluster itself is kafka_2.11-

*Juho Autio*
Senior Analytics Developer

Data Ops, Games
Rovio Entertainment Ltd
Mobile: + 358 (0)45 313 0122

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