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Posted to dev@kafka.apache.org by "Peter Romianowski (JIRA)" <ji...@apache.org> on 2012/05/18 16:37:06 UTC
[jira] [Updated] (KAFKA-345) Add a listener to
ZookeeperConsumerConnector to get notified on rebalance events
[ https://issues.apache.org/jira/browse/KAFKA-345?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Peter Romianowski updated KAFKA-345:
------------------------------------
Description:
h1. A sample use-case
In our scenario we partition events by userid and then apply these to some kind of state machine, that modifies the actual state of a user. So events trigger state transitions. In order to avoid the need of loading user's state upon each event processed, we cache that. But if a user's partition is moved to another consumer and then back to the previous consumer we have stale caches and hell breaks loose. I guess the same kind of problem occurs in other scenarios like counting numbers by user, too.
> Add a listener to ZookeeperConsumerConnector to get notified on rebalance events
> --------------------------------------------------------------------------------
>
> Key: KAFKA-345
> URL: https://issues.apache.org/jira/browse/KAFKA-345
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Affects Versions: 0.7, 0.8
> Reporter: Peter Romianowski
>
> h1. A sample use-case
> In our scenario we partition events by userid and then apply these to some kind of state machine, that modifies the actual state of a user. So events trigger state transitions. In order to avoid the need of loading user's state upon each event processed, we cache that. But if a user's partition is moved to another consumer and then back to the previous consumer we have stale caches and hell breaks loose. I guess the same kind of problem occurs in other scenarios like counting numbers by user, too.
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