[PR] AddFiles: extract bounded async task plumbing and Parquet footer reads [beam]

Wed, 26 Aug 2026 14:13:43 -0700 


claudevdm opened a new pull request, #39896:
URL: https://github.com/apache/beam/pull/39896

   ConvertToDataFile ran its per-file work (footer read, metrics, partition
   resolution) on a private thread pool.
   
   This change moves that queue into BoundedAsyncTasks and the footer read
   into ParquetFooters so the upcoming schema pre-pass (a second DoFn that
   reads every Parquet footer) can share both instead of copying them.
   
   
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