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https://issues.apache.org/jira/browse/SPARK-21145?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16054945#comment-16054945
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Apache Spark commented on SPARK-21145:
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User 'tdas' has created a pull request for this issue:
https://github.com/apache/spark/pull/18355
> Restarted queries reuse same StateStoreProvider, causing multiple concurrent
> tasks to update same StateStore
> ------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-21145
> URL: https://issues.apache.org/jira/browse/SPARK-21145
> Project: Spark
> Issue Type: Bug
> Components: Structured Streaming
> Affects Versions: 2.2.0
> Reporter: Tathagata Das
> Assignee: Tathagata Das
>
> StateStoreProvider instances are loaded on-demand in a executor when a query
> is started. When a query is restarted, the loaded provider instance will get
> reused. Now, there is a non-trivial chance, that the task of the previous
> query run is still running, while the tasks of the restarted run has started.
> So for a stateful partition, there may be two concurrent tasks related to the
> same stateful partition, and there for using the same provider instance. This
> can lead to inconsistent results and possibly random failures, as state store
> implementations are not designed to be thread-safe.
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