mrhhsg commented on PR #63258:
URL: https://github.com/apache/doris/pull/63258#issuecomment-6122164289

   Pushed c8b95c634a7, which replaces the previous approach (metadata-only 
request copy + a second http helper for the shared broadcast block) with one 
ownership rule for every exchange request:
   
   - `borrow_block()` / `release_borrowed_blocks()` fill and release the 
request the same way for unicast and broadcast, single-block and multi-block 
sends; the request never owns block data, so the http attachment path never has 
to know who owns the payload and never touches the shared 
`BroadcastPBlockHolder` block.
   - The attachment carries one payload per block, so multi-block requests (the 
default `exchange_multi_blocks_byte_size`) can take the http path too instead 
of failing on the brpc size limit.
   - The receiver parses the request before taking the `column_values` slots, 
so presence no longer depends on an empty field on the wire; it also validates 
the attachment framing and `tablet_writer_add_block_by_http` now answers the 
rpc when extraction fails.
   
   The PR description has been rewritten accordingly. @HappenLee since the 
mechanism changed after your approval, a second look would be appreciated.
   


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