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Posted to issues@arrow.apache.org by "Joris Van den Bossche (JIRA)" <ji...@apache.org> on 2019/07/04 15:58:00 UTC
[jira] [Commented] (ARROW-5825) [Python] Exceptions swallowed in
ParquetManifest._visit_directories
[ https://issues.apache.org/jira/browse/ARROW-5825?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16878763#comment-16878763 ]
Joris Van den Bossche commented on ARROW-5825:
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[~gsakkis] do you have a reproducible example? You need a parquet dataset with eg an invalid file that raises an error when reading the metadata?
> [Python] Exceptions swallowed in ParquetManifest._visit_directories
> -------------------------------------------------------------------
>
> Key: ARROW-5825
> URL: https://issues.apache.org/jira/browse/ARROW-5825
> Project: Apache Arrow
> Issue Type: Bug
> Components: Python
> Reporter: George Sakkis
> Priority: Major
> Labels: Parquet
>
> {{ParquetManifest._visit_directories}} uses a {{ThreadPoolExecutor}} to visit partitioned parquet datasets concurrently, it waits for them to finish but doesn't check if the respective futures have failed or not. This is quite tricky to detect and debug as an exception is either raised later as a a side-effect or (perhaps worse) it passes silently.
> Observed on 0.12.1 but appears to be on latest master too.
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