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From "Narayan Periwal (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (KAFKA-6681) Two instances of kafka consumer reading the same partition within a consumer group
Date Tue, 20 Mar 2018 16:41:00 GMT

     [ https://issues.apache.org/jira/browse/KAFKA-6681?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Narayan Periwal updated KAFKA-6681:
    Attachment: server-2.log

> Two instances of kafka consumer reading the same partition within a consumer group
> ----------------------------------------------------------------------------------
>                 Key: KAFKA-6681
>                 URL: https://issues.apache.org/jira/browse/KAFKA-6681
>             Project: Kafka
>          Issue Type: Bug
>          Components: consumer
>    Affects Versions:
>            Reporter: Narayan Periwal
>            Priority: Critical
>         Attachments: server-1.log, server-2.log
> We have seen this issue with the Kafka consumer, the new library that got introduced
in 0.9
> With this new client, the group management is done by kafka coordinator, which is one
of the kafka broker.
> We are using Kafka broker and consumer client version is also 
> The issue that we have faced is that, after rebalancing, some of the partitions gets
consumed by 2 instances within a consumer group, leading to duplication of the entire partition
data. Both the instances continue to read until the next rebalancing, or the restart of
those clients. 
> It looks like that a particular consumer goes on fetching the data from a partition,
but the broker is not able to identify this "stale" consumer instance. 
> During this time, we also see the underreplicated partition metrics spiking. 
> We have hit this twice in production. Please look at it the earliest. 

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