[PR] [Python SDK] Add support for named data streams to provide bundle isolation [beam]

Tue, 08 Sep 2026 12:20:32 -0700 


scwhittle opened a new pull request, #40061:
URL: https://github.com/apache/beam/pull/40061

   This is advertised to the runner via a new NAMED_DATA_STREAMS protocol 
capability. The runner is then free to assign bundles to named data streams as 
it chooses to isolate bundle processing from each other. Instead of single data 
stream from the sdk, the sdk will create a data stream for each name. The 
benefit of doing so is that the multiplexing currently performed on data stream 
messages being received allows a slow bundle to fill up buffers and block the 
shared stream. With separate named streams, bundles on other data streams have 
separate grpc flow control from the blocked stream and are not affected.
   
   This is related to issue #39001 and similar support was added for the Java 
sdk in #38863
   
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