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https://issues.apache.org/jira/browse/KAFKA-3104?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guozhang Wang resolved KAFKA-3104.
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Resolution: Fixed
Fix Version/s: 0.9.1.0
Issue resolved by pull request 781
[https://github.com/apache/kafka/pull/781]
> Windowed Stream Aggregation Implementation
> ------------------------------------------
>
> Key: KAFKA-3104
> URL: https://issues.apache.org/jira/browse/KAFKA-3104
> Project: Kafka
> Issue Type: Sub-task
> Reporter: Guozhang Wang
> Assignee: Guozhang Wang
> Fix For: 0.9.1.0
>
>
> Proposed approach:
> 1. Add a K-V store with format <key, window> : <agg-value> with Windowed<K>
> ser-de and <T> ser-de.
> 2. Upon receiving a record forwarded from the upstream processor:
> 2.1. First get the mapping window(s) from the context timestamp.
> 2.2. For each window, first try fetch from the store, if not exist call
> initialValue().
> 2.2. Only call add(..), and never call remove(..)
> 2.3. Forward the aggregate value with key Windowed<agg-key> and value
> Change<agg-value>.
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