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https://issues.apache.org/jira/browse/SPARK-35396?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean R. Owen reassigned SPARK-35396:
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Assignee: Apache Spark
> Support to manual close/release entries in MemoryStore and InMemoryRelation
> instead of replying on GC
> -----------------------------------------------------------------------------------------------------
>
> Key: SPARK-35396
> URL: https://issues.apache.org/jira/browse/SPARK-35396
> Project: Spark
> Issue Type: New Feature
> Components: Spark Core, SQL
> Affects Versions: 3.0.3, 3.1.2, 3.2.0
> Reporter: Chendi.Xue
> Assignee: Apache Spark
> Priority: Major
>
> This PR is proposing a add-on to support to manual close entries in
> MemoryStore and InMemoryRelation
> h3. What changes were proposed in this pull request?
> Currently:
> MemoryStore uses a LinkedHashMap[BlockId, MemoryEntry[_]] to store all OnHeap
> or OffHeap entries.
> And when memoryStore.remove(blockId) is called, codes will simply remove one
> entry from LinkedHashMap and leverage Java GC to do release work.
> This PR:
> We are proposing a add-on to manually close any object stored in MemoryStore
> and InMemoryRelation if this object is extended from AutoCloseable.
> Veifiication:
> In our own use case, we implemented a user-defined off-heap-hashRelation for
> BHJ, and we verified that by adding this manual close, we can make sure our
> defined off-heap-hashRelation can be released when evict is called.
> Also, we implemented user-defined cachedBatch and will be release when
> InMemoryRelation.clearCache() is called by this PR
> h3. Why are the changes needed?
> This changes can help to clean some off-heap user-defined object may be
> cached in InMemoryRelation or MemoryStore
> h3. Does this PR introduce _any_ user-facing change?
> NO
> h3. How was this patch tested?
> WIP
> Signed-off-by: Chendi Xue [chendi....@intel.com|mailto:chendi....@intel.com]
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