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Posted to issues@spark.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2024/09/10 22:33:00 UTC
[jira] [Updated] (SPARK-49592) OperatorStateMetadataV2 can return incorrect metadata for the given batchId
[ https://issues.apache.org/jira/browse/SPARK-49592?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated SPARK-49592:
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Labels: pull-request-available (was: )
> OperatorStateMetadataV2 can return incorrect metadata for the given batchId
> ---------------------------------------------------------------------------
>
> Key: SPARK-49592
> URL: https://issues.apache.org/jira/browse/SPARK-49592
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 4.0.0
> Reporter: Neil Ramaswamy
> Priority: Major
> Labels: pull-request-available
>
> Currently, the `OperatorStateMetadataV2Reader` has an off-by-one error when reading metadata for a given batchId. The issue is on [this line|https://github.com/apache/spark/blob/ea4b82e97d944717b32aaaec986a8238e59b8acf/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala#L349].
> Suppose the batches in the checkpoint location is just `0`, and the desired `batchId` is 1. The logic lists all of the batches, filters for less than `batchId`, and takes the last element. This can return the metadata for `0`, when really we want the metadata for `1`. The reason we didn't catch this before was because [this check|https://github.com/apache/spark/blob/ea4b82e97d944717b32aaaec986a8238e59b8acf/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/state/OperatorStateMetadata.scala#L316-L318] prevented us from getting to the point where we attempted to read metadata for a batch whose offset didn't yet exist.
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