[
https://issues.apache.org/jira/browse/KAFKA-3104?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Work on KAFKA-3104 started by Guozhang Wang.
--------------------------------------------
> 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
>
> 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>.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
