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Posted to issues@spark.apache.org by "Cody Koeninger (JIRA)" <ji...@apache.org> on 2018/07/06 13:07:00 UTC
[jira] [Commented] (SPARK-24720) kafka transaction creates
Non-consecutive Offsets (due to transaction offset) making streaming fail
when failOnDataLoss=true
[ https://issues.apache.org/jira/browse/SPARK-24720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534797#comment-16534797 ]
Cody Koeninger commented on SPARK-24720:
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What's your plan to tell the difference between gaps due to transactions and gaps due to data loss?
> kafka transaction creates Non-consecutive Offsets (due to transaction offset) making streaming fail when failOnDataLoss=true
> ----------------------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-24720
> URL: https://issues.apache.org/jira/browse/SPARK-24720
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.3.1
> Reporter: Quentin Ambard
> Priority: Major
>
> When kafka transactions are used, sending 1 message to kafka will result to 1 offset for the data + 1 offset to mark the transaction.
> When kafka connector for spark streaming read a topic with non-consecutive offset, it leads to a failure. SPARK-17147 fixed this issue for compacted topics.
> However, SPARK-17147 doesn't fix this issue for kafka transactions: if 1 message + 1 transaction commit are in a partition, spark will try to read offsets [0 2[. offset 0 (containing the message) will be read, but offset 1 won't return a value and buffer.hasNext() will be false even after a poll since no data are present for offset 1 (it's the transaction commit)
>
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