Kaijie Chen created HDDS-5481:
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Summary: Fix stream() and link() method in ContainerStateMachine
Key: HDDS-5481
URL: https://issues.apache.org/jira/browse/HDDS-5481
Project: Apache Ozone
Issue Type: Sub-task
Reporter: Kaijie Chen
Assignee: Kaijie Chen
The link() method is missing `Override` annotation.
The stream() method has a bug: the parsing of request.message is inconsistent
with the ContainerStateMachine#startTransaction(), which will be called during
the close of the stream. This caused the stream closing issue in our POC.
Here is the details about the issue in stream() method, by diving deep into the
Ratis streaming implementation:
When initializing the stream, we need pass a headerMessage to
DataStreamApi#stream().
{code:java}
DataStreamOutput stream(ByteBuffer headerMessage, RoutingTable routingTable);
{code}
This message will be used again when calling the DataStreamOutput#close, by the
primary DataNode, in DataStreamManageMent#startTransaction.
It is wrapped in a Raft FORWARD request, then unwrapped in the
RaftServerImpl#SubmitClientRequestAsync. The filter here is doing the unwrap
job.
{code:java}
TransactionContext context =
stateMachine.startTransaction(filterDataStreamRaftClientRequest(request));{code}
Then it hands the headerMessage to ContainerStateMachine#startTransaction.
In ContainerStateMachine#startTransaction, it's expecting the request being a
ContainerCommandRequestMessage.
However, in ContainerStateMachine#stream, it's expecting the same request being
a ContainerCommandRequestProto.
So we have to change the ContainerStateMachine#stream to match
ContainerStateMachine#startTransaction.
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