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https://issues.apache.org/jira/browse/SPARK-23827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li updated SPARK-23827:
----------------------------
    Fix Version/s:     (was: 3.0.0)

> StreamingJoinExec should ensure that input data is partitioned into specific 
> number of partitions
> -------------------------------------------------------------------------------------------------
>
>                 Key: SPARK-23827
>                 URL: https://issues.apache.org/jira/browse/SPARK-23827
>             Project: Spark
>          Issue Type: Bug
>          Components: Structured Streaming
>    Affects Versions: 2.3.0
>            Reporter: Tathagata Das
>            Assignee: Tathagata Das
>            Priority: Critical
>             Fix For: 2.3.1, 2.4.0
>
>
> Currently, the requiredChildDistribution does not specify the partitions. 
> This can cause the weird corner cases where the child's distribution is 
> `SinglePartition` which satisfies the required distribution of 
> `ClusterDistribution(no-num-partition-requirement)`, thus eliminating the 
> shuffle needed to repartition input data into the required number of 
> partitions (i.e. same as state stores). That can lead to "file not found" 
> errors on the state store delta files as the micro-batch-with-no-shuffle will 
> not run certain tasks and therefore not generate the expected state store 
> delta files.



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