Artem Kupchinskiy created SPARK-25885:
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Summary: HighlyCompressedMapStatus deserialization optimization
Key: SPARK-25885
URL: https://issues.apache.org/jira/browse/SPARK-25885
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 2.2.0
Reporter: Artem Kupchinskiy
HighlyCompressedMapStatus uses unnecessary indirection level during
deserialization and construction. It uses ArrayBuffer, as an interim storage,
before the actual map construction. Since both methods could be application hot
spots under certain workloads, it is worth to get rid of that intermediate
level.
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