[ https://issues.apache.org/jira/browse/ARROW-15784?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Weston Pace updated ARROW-15784: -------------------------------- Issue Type: Bug (was: Improvement) > [C++][Python] Parallel parquet file reading disabled with single file reads > --------------------------------------------------------------------------- > > Key: ARROW-15784 > URL: https://issues.apache.org/jira/browse/ARROW-15784 > Project: Apache Arrow > Issue Type: Bug > Components: C++, Python > Affects Versions: 7.0.0 > Reporter: Weston Pace > Assignee: Weston Pace > Priority: Major > Fix For: 7.0.1 > > > There is a flag {{enable_parallel_column_conversion}} which was passed down > from python to C++ when reading parquet datasets which controlled whether we > would read columns in parallel. This was allowed for single files but not > for reading multiple files. This was an old check to help prevent nested > deadlock. > Nested deadlock is no longer an issue and the flag was mostly inert once we > removed the synchronous scanner. > Unfortunately, when we removed the synchronous scanner we forgot to remove > this flag and the result was that a single-file read ended up disabling > parallelism. -- This message was sent by Atlassian Jira (v8.20.1#820001)