HBASE-30246 MOB compaction does not close MobCell after resolving ref…

[liuxiaocs7]

…erence cells

• see: HBASE-30246

[Copilot]

Pull request overview

Note

Copilot couldn't run its full agentic review because no GitHub Actions runner was available. Make sure your repository has a runner available to run Copilot's review, or add a copilot-setup-steps.yml file specifying one with the runs-on attribute. See the docs for more details.

This PR addresses HBASE-30246 by ensuring MOB reference resolution during compaction properly closes the MobCell and returns a safe, heap-resident copy of the resolved cell to avoid leaking scanners/buffers and referencing recycled NIO buffers.

Changes:

• Introduce DefaultMobStoreCompactor#resolveMobCell(...) that closes MobCell and returns an independent copied ExtendedCell.
• Update compaction paths to use resolveMobCell(...) instead of directly using mobStore.resolve(...).getCell().
• Strengthen tests to use try-with-resources for MobCell and add a unit test verifying close + copy semantics.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
hbase-server/src/main/java/org/apache/hadoop/hbase/mob/DefaultMobStoreCompactor.java	Adds resolveMobCell helper to close resolved MobCell and copy resolved cells safely; compaction updated to use it.
hbase-server/src/test/java/org/apache/hadoop/hbase/mob/FaultyMobStoreCompactor.java	Aligns test compactor implementation with new resolveMobCell behavior.
hbase-server/src/test/java/org/apache/hadoop/hbase/mob/TestDefaultMobStoreCompactor.java	Adds unit test verifying resolveMobCell closes MobCell and returns an independent copy.
hbase-server/src/test/java/org/apache/hadoop/hbase/regionserver/TestHMobStore.java	Updates resolve test to close MobCell via try-with-resources and dereference via getCell().

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[liuxiaocs7]

Thanks @guluo2016 for reviewing!