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Posted to dev@flink.apache.org by "Fan Hong (Jira)" <ji...@apache.org> on 2023/03/27 07:26:00 UTC

[jira] [Created] (FLINK-31623) Improvements on DataStreamUtils#sample

Fan Hong created FLINK-31623:
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             Summary: Improvements on DataStreamUtils#sample
                 Key: FLINK-31623
                 URL: https://issues.apache.org/jira/browse/FLINK-31623
             Project: Flink
          Issue Type: Improvement
          Components: Library / Machine Learning
            Reporter: Fan Hong


Current implementation employs two-level sampling method, which could encounter two issues:
 # 
One subtask has a memory footprint twice as large as the other subtasks, which could cause unexpected OOM in some situations.
 
 # When data instances are imbalanced distributed among partitions (subtasks), the probabilities of instances to be sampled are different in different partitions (subtasks).



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