scwhittle opened a new pull request, #31410:
URL: https://github.com/apache/beam/pull/31410

   With WriteFiles, if the temp staging region/replication differs from the 
final output location, the rewrite operations used are not metadata operations 
but involve copying data.
   
   This may be desirable to reduce replication changes as GCS bills 
bytes*replication for temporary files separately even if they are rewritten 
with a metadata rewrite op.
   
   Currently when experimenting with this, the pipeline can fail due to read 
timeouts executing the rewrite op batches. Batch operations are best used for 
lightweight operations and I believe the timeout is occurring due to too much 
batching when copying data.
   
   This PR changes the lowers the batch size for rewrite operations that likely 
involve copying due to different buckets, as well as adding options to control 
the timeouts and batch size if further adjustments are needed.
   
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