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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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Riya Verma updated SPARK-48586:
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Summary: Remove lock acquisition in doMaintenance() by making a deep copy
of RocksDBFileManager in load() (was: Remove lock contention between
maintenance and task threads)
> Remove lock acquisition in doMaintenance() by making a deep copy of
> 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
> 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. To eliminate the lock contention, lock acquisition
> inside maintenance tasks should be avoided. To prevent race conditions
> between task and maintenance threads, we can ensure that *RocksDBFileManager*
> has a linear history by ensuring a deep copy of *RocksDBFileManager* every
> time a previous version is loaded. The original file manager is not affected
> by future state update. The new file manager is not affected by background
> snapshot uploading tasks that attempt to upload a snapshot.
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