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

["Antoine Pitrou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-6667?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou reassigned ARROW-6667:
-------------------------------------

    Assignee: Aaron Opfer

> [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
>          Components: Python
>            Reporter: Aaron Opfer
>            Assignee: Aaron Opfer
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 0.15.0
>
>         Attachments: cycle1_build_nested_path.PNG, cycle2_open_dataset.PNG
>
>          Time Spent: 2.5h
>  Remaining Estimate: 0h
>
> 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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