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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