[jira] [Created] (ARROW-6667) [Python] Avoid Reference Cycles in pyarrow.parquet

["Aaron Opfer (Jira)" <ji...@apache.org>]

Aaron Opfer created ARROW-6667:
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             Summary: [Python] Avoid Reference Cycles in pyarrow.parquet
                 Key: ARROW-6667
                 URL: https://issues.apache.org/jira/browse/ARROW-6667
             Project: Apache Arrow
          Issue Type: Improvement
            Reporter: Aaron Opfer
         Attachments: cycle1_build_nested_path.PNG, cycle2_open_dataset.PNG

Reference cycles appear in two places inside pyarrow.parquet which causes these objects to have much longer lifetimes than necessary:

 

{{_build_nested_path}} has a reference cycle because the closured function refers to the parent cell which also refers to the closured function again (objgraph shown in attachment)

{{open_dataset_file}} is partialed with self inside the {{ParquetFile}} class (objgraph shown in attachment).



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