[
https://issues.apache.org/jira/browse/SPARK-50046?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17891374#comment-17891374
]
Jungtaek Lim commented on SPARK-50046:
--------------------------------------
Will submit a PR.
> [Possible bug] Incorrect watermark advancement if watermark node is
> lost/pruned
> -------------------------------------------------------------------------------
>
> Key: SPARK-50046
> URL: https://issues.apache.org/jira/browse/SPARK-50046
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 4.0.0
> Reporter: Jungtaek Lim
> Priority: Major
>
> This does not happen in current optimization rules, but it was mostly a luck
> and we were silently dropping CollectMetrics node, hence it'd be ideal to
> address the issue in prior.
> WatermarkTracker only looks at the physical plan during calculation of the
> new watermark value. It determines the watermark node by index, hence we have
> various issues when the watermark node is lost on the optimization.
> 1) watermark advancement is made even there is one node to be dropped (should
> be considered as no data from that node)
> 2) watermark tracker incorrectly update the memory map of the previous value
> of watermark node (index is not a stable key)
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
