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Posted to issues@arrow.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2019/09/23 16:07:00 UTC
[jira] [Updated] (ARROW-6667) [Python] Avoid Reference Cycles in
pyarrow.parquet
[ https://issues.apache.org/jira/browse/ARROW-6667?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
ASF GitHub Bot updated ARROW-6667:
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Labels: pull-request-available (was: )
> [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
> Priority: Minor
> Labels: pull-request-available
> 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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