Tengfei Huang created SPARK-56410:
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Summary: Add bounded k-way merge support in UnsafeExternalSorter
Key: SPARK-56410
URL: https://issues.apache.org/jira/browse/SPARK-56410
Project: Spark
Issue Type: Task
Components: Spark Core, SQL
Affects Versions: 4.1.1
Reporter: Tengfei Huang
Currently the UnsafeExternalSorter will merge all the spills at once which will
need lots of memory, increases OOM risks for large jobs.
Propose to add bounded k-way merge to remove the risk.
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