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https://issues.apache.org/jira/browse/SPARK-48586?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jungtaek Lim reassigned SPARK-48586:
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Assignee: Riya Verma
> Remove lock acquisition in doMaintenance() by making a deep copy of file
> mappings in RocksDBFileManager in load()
> -----------------------------------------------------------------------------------------------------------------
>
> Key: SPARK-48586
> URL: https://issues.apache.org/jira/browse/SPARK-48586
> Project: Spark
> Issue Type: Improvement
> Components: Structured Streaming
> Affects Versions: 3.4.3
> Reporter: Riya Verma
> Assignee: Riya Verma
> Priority: Major
> Labels: pull-request-available
>
> Currently the lock of the *RocksDB* state store is acquired when uploading
> the snapshot inside maintenance tasks when change log checkpointing is
> enabled, which causes lock contention between query processing tasks and
> state maintenance thread. We want to eliminate lock contention to decrease
> latency of streaming queries so lock acquisition inside maintenance tasks
> should be avoided. This can introduce race conditions between task and
> maintenance threads. By making a deep copy of {{versionToRocksDBFiles}} and
> {{localFilesToDfsFiles}} in {*}RocksDBFileManager{*}, we can ensure that the
> file manager state is not updated by task thread when background snapshot
> uploading tasks attempt to upload a snapshot.
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