rpuch commented on code in PR #2473:
URL: https://github.com/apache/ignite-3/pull/2473#discussion_r1311744626
##########
modules/runner/src/integrationTest/java/org/apache/ignite/internal/raftsnapshot/ItTableRaftSnapshotsTest.java:
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@@ -792,6 +816,116 @@ void
testChangeLeaderDuringSnapshotInstallationToLeaderWithEnoughLog() throws Ex
assertThat(rows, is(List.of(new IgniteBiTuple<>(1, "one"))));
}
+ /**
+ * The replication mechanism must not replicate commands for which schemas
are not yet available on the node
+ * to which replication happens (in Raft, it means that followers/learners
cannot receive commands that they
+ * cannot execute without waiting for schemas). This method tests that
snapshots bringing such commands are
+ * rejected, and that, when metadata catches up, the snapshot gets
successfully installed.
+ */
+ @Test
+ void laggingSchemasOnFollowerPreventSnapshotInstallation() throws
Exception {
+ cluster.startAndInit(3);
+
+ createTestTableWith3Replicas(DEFAULT_STORAGE_ENGINE);
+
+ // Prepare the scene: force node 0 to be a leader, and node 2 to be a
follower.
+
+ final int leaderIndex = 0;
+ final int followerIndex = 2;
+
+ transferLeadershipOnSolePartitionTo(leaderIndex);
+ cluster.transferLeadershipTo(leaderIndex, MetastorageGroupId.INSTANCE);
+
+ // Block AppendEntries from being accepted on the follower so that the
leader will have to use a snapshot.
+ blockIncomingAppendEntriesAt(followerIndex);
Review Comment:
I don't understand what you suggest, please elaborate
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