Kirill Tkalenko created IGNITE-24785:
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Summary: Implement test of enter a node with an index greater than
the current majority
Key: IGNITE-24785
URL: https://issues.apache.org/jira/browse/IGNITE-24785
Project: Ignite
Issue Type: Improvement
Reporter: Kirill Tkalenko
Assignee: Kirill Tkalenko
It would be useful for us to check how the cluster will behave when fsync is
turned off for table raft groups and enter a node with an index greater than
the current majority.
It is proposed to implement a test with emulation of the loss of part of the
raft log by simply truncating it and implement it in the form of integration
tests.
Scenario:
1. Start 3 nodes and initialize the cluster.
2. Create a zone and table with 1 partition and 3 replicas.
3. Make node C leader of the raft group.
4. Insert 10 rows into the table row by row in its own transaction.
5. Stop all nodes.
6. Truncate the raft log at all nodes.
a. At nodes A and B we will cut off the current raft index - 5.
b. On node C we leave the raft index as is.
7. Start nodes A and B and wait for a majority to be formed from these nodes.
8. Start node C.
9. Check what is happening with the cluster. Expected behavior:
a. Raft will figure it out somehow, for example by doing a full data
replication or installing a snapshot.
b. Disaster recovery will be required for node C, and we will do it through
the disaster recovery API.
10. Check that we were able to read all 10 rows from table on all nodes.
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