Gengliang Wang created SPARK-24524:
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Summary: Improve aggregateMetrics: less memory usage and loops
Key: SPARK-24524
URL: https://issues.apache.org/jira/browse/SPARK-24524
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.3.1
Reporter: Gengliang Wang
The function `aggregateMetrics` process metrics from both executors and driver.
The data can be large.
This PR is to improve the implementation with one loop(before converting to
string) and one dynamic data structure.
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