[GitHub] [ozone] ckj996 commented on pull request #2452: HDDS-5480. [Ozone-Streaming] Client and server should support stream setup.

[GitBox <gi...@apache.org>]

ckj996 commented on pull request #2452:
URL: https://github.com/apache/ozone/pull/2452#issuecomment-885365975


   > One more question, whats the use of stream init, and how is it different from the first data packet to be sent from client to the datanode ?
   
   Stream init do 2 things: build the stream pipeline, and get a file path from the container for subsequent writes.
   
   Ratis: Build the stream pipeline according to the routing table. If no routing table is given, it will fallback to
   
   ```
   Client -----> Primary -----> Secondary 1
                    |
                    +---------> Secondary 2
   ```
   
   HDDS Container: prepare a file for write, but does not write any data. In our POC code, we let the ContainerStateMachine calculate the path of that file as if there is a WriteChunk request.
   
   ---
   
   The first data packet, of course, write data into that file.


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