Marton Elek created HDDS-2974:
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Summary: Create Freon tests to test isolated Ratis components
Key: HDDS-2974
URL: https://issues.apache.org/jira/browse/HDDS-2974
Project: Hadoop Distributed Data Store
Issue Type: Improvement
Reporter: Marton Elek
We have a specific Freon (=load generator) test to test one specific, working,
Ratis pipeline (3 datanodes): DatanodeChunkGenerator
It sends Ozone GRPC requests to the datanode with WriteChunk requests.
But we have no easy way to test just *one* the *running* Ratis component.
In this Jira I propose to create two tests.
*FollowerAppendLogEntryGenerator*
If Datanode can be started without registration it contains an empty Ratis
server instance.
Freon test can initialize a new group and request vote with behaving like a
real LEADER. It can send real appendLogEntry requests (the Ratis HB messages)
with GRPC
With this approach we can force the datanode to be a FOLLOWER and analyze and
profile the behaviour.
*LeaderAppendLogEntryGenerator*
This is the opposite side, we need fake followers to test one leader. It
requires to patch Ratis to immediately return with a fake answer instead of
sending it to the followers.
If this patch is in place, we can start the freon test, which can configure the
group in the leader and send ratis client messages to the leader.
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