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From "Zach Cox (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-3375) Allow Watermark Generation in the Kafka Source
Date Mon, 22 Feb 2016 17:11:18 GMT

    [ https://issues.apache.org/jira/browse/FLINK-3375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15157295#comment-15157295
] 

Zach Cox commented on FLINK-3375:
---------------------------------

Our specific app is currently using Kafka 0.8 (we plan to upgrade brokers to 0.9 in next few
months).

> Allow Watermark Generation in the Kafka Source
> ----------------------------------------------
>
>                 Key: FLINK-3375
>                 URL: https://issues.apache.org/jira/browse/FLINK-3375
>             Project: Flink
>          Issue Type: Improvement
>          Components: Kafka Connector
>    Affects Versions: 1.0.0
>            Reporter: Stephan Ewen
>             Fix For: 1.0.0
>
>
> It is a common case that event timestamps are ascending inside one Kafka Partition. Ascending
timestamps are easy for users, because they are handles by ascending timestamp extraction.
> If the Kafka source has multiple partitions per source task, then the records become
out of order before timestamps can be extracted and watermarks can be generated.
> If we make the FlinkKafkaConsumer an event time source function, it can generate watermarks
itself. It would internally implement the same logic as the regular operators that merge streams,
keeping track of event time progress per partition and generating watermarks based on the
current guaranteed event time progress.



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