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Posted to issues@spark.apache.org by "Jungtaek Lim (Jira)" <ji...@apache.org> on 2019/10/01 08:23:00 UTC
[jira] [Comment Edited] (SPARK-28094) Multiple left joins or
aggregations in one query produce incorrect results
[ https://issues.apache.org/jira/browse/SPARK-28094?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941623#comment-16941623 ]
Jungtaek Lim edited comment on SPARK-28094 at 10/1/19 8:22 AM:
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FYI: After SPARK-28074, Spark will log warn message for query which has the pattern of "possibly" emitting late rows. SPARK-24634 proposes to expose the number of late rows (older than watermark + allowed delay) in both SQL execution detail page and streaming query listener, which helps identifying the correctness issue.
was (Author: kabhwan):
FYI: After SPARK-28074, Spark will log warn message for query which has the pattern of "possibly" emitting late rows. SPARK-24634 will also expose the number of late rows (older than watermark + allowed delay) in both SQL execution detail page and streaming query listener.
> Multiple left joins or aggregations in one query produce incorrect results
> --------------------------------------------------------------------------
>
> Key: SPARK-28094
> URL: https://issues.apache.org/jira/browse/SPARK-28094
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.4.3
> Reporter: Joe Ammann
> Priority: Major
>
> Structured streaming queries which involve more than one non-map-like transformations (either left joins or aggregations) produce incorrect (and sometimes inconsistent) results.
> I have put up a sample here as Gist https://gist.github.com/jammann/b58bfbe0f4374b89ecea63c1e32c8f17
> The test case involves 4 topics, and I've implement 6 different use cases of which 3 fail to produce the expected results
> 1) A innerjoin B: to topic A_B
> expected: 10 inner joined messages
> observation: OK
> 2) A innerjoin B outerjoin C: to topic A_B_outer_C
> expected: 9 inner joined messages, last one in watermark
> observation: OK
> 3) A innerjoin B outerjoin C outerjoin D: to topic A_B_outer_C_outer_D
> expected: 9 inner/outer joined messages, 3 match C, 1 match D, last one in watermark
> observation: NOK, only 3 messages are produced, where the C outer join matches
> 4) B outerjoin C: to topic B_outer_C
> expected: 9 outer joined messages, 3 match C, 1 match D, last one in watermark
> observation: NOK, same as 3
> 5) A innerjoin B agg on field of A: to topic A_inner_B_agg
> expected: 3 groups with a total of 9 inner joined messages, last one in watermark
> observation: OK
> 6) A innerjoin B outerjoin C agg on field of A: to topic A_inner_B_outer_C_agg
> expected: 3 groups with a total of 9 inner joined messages, last one in watermark
> observation: NOK, 3 groups with 1 message each, where C outer join matches
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