public void FallBackToSequentialScanWhenAllNodesDeadTest()
{
var nodes = new BobNodeClientStatusMock[]
{
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
};
var policy = FirstWorkingNodeSelectionPolicy.Factory.Create(nodes);
int prev = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
for (int i = 0; i < 100; i++)
{
int expected = (prev + 1) % nodes.Length;
int cur = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
Assert.Equal(expected, cur);
prev = cur;
}
}
public void RetrySkipsNotWorkingTest()
{
var nodes = new BobNodeClientStatusMock[]
{
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock(),
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock()
};
var policy = FirstWorkingNodeSelectionPolicy.Factory.Create(nodes);
int firstAttempt = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
Assert.Equal(1, firstAttempt);
int secondAttempt = policy.SelectNodeIndexOnRetry(firstAttempt, BobOperationKind.Get, default(BobKey));
Assert.Equal(4, secondAttempt);
}
public void SkipsNonWorkingNodesTest()
{
var nodes = new BobNodeClientStatusMock[]
{
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock(),
new BobNodeClientStatusMock()
};
var policy = FirstWorkingNodeSelectionPolicy.Factory.Create(nodes);
int initial = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
Assert.Equal(2, initial);
for (int i = 0; i < 100; i++)
{
int cur = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
Assert.Equal(initial, cur);
}
}
public void SimpleFirstNodeSelectionTest()
{
var nodes = new BobNodeClientStatusMock[]
{
new BobNodeClientStatusMock(),
new BobNodeClientStatusMock(),
new BobNodeClientStatusMock(),
new BobNodeClientStatusMock()
};
var policy = FirstWorkingNodeSelectionPolicy.Factory.Create(nodes);
int initial = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
Assert.Equal(0, initial);
for (int i = 0; i < 100; i++)
{
int cur = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
Assert.Equal(initial, cur);
}
}
public void NoRetryWhenAllNodesDeadTest()
{
var nodes = new BobNodeClientStatusMock[]
{
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
};
var policy = FirstWorkingNodeSelectionPolicy.Factory.Create(nodes);
int initial = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
int retry = policy.SelectNodeIndexOnRetry(initial, BobOperationKind.Get, default(BobKey));
Assert.True(retry < 0);
}
public void SimpleSequenceTest()
{
var nodes = new BobNodeClientStatusMock[]
{
new BobNodeClientStatusMock(),
new BobNodeClientStatusMock(),
new BobNodeClientStatusMock(),
new BobNodeClientStatusMock()
};
var factory = SequentialWorkingNodeSelectionPolicy.CreateFactory(1, 1000);
var policy = factory.Create(nodes);
int initial = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
for (int i = 0; i < 1000; i++)
{
int cur = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
Assert.Equal((initial + i + 1) % nodes.Length, cur);
}
}
public void RetrySkipsNotWorkingTest()
{
var nodes = new BobNodeClientStatusMock[]
{
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock(),
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock()
{
State = BobNodeClientState.TransientFailure, SequentialErrorCount = 100
},
new BobNodeClientStatusMock()
};
var factory = SequentialWorkingNodeSelectionPolicy.CreateFactory(1, 1000);
var policy = factory.Create(nodes);
int prev = policy.SelectNodeIndex(BobOperationKind.Get, default(BobKey));
for (int i = 0; i < 1000; i++)
{
int expected = (prev + 1) % nodes.Length;
while (nodes[expected].State != BobNodeClientState.Ready)
{
expected = (expected + 1) % nodes.Length;
}
int cur = policy.SelectNodeIndexOnRetry(prev, BobOperationKind.Get, default(BobKey));
Assert.Equal(BobNodeClientState.Ready, nodes[cur].State);
Assert.Equal(expected, cur);
prev = cur;
}
}