Tests - IP allocation - new test that shows current LCP2 failure

There are 4 IPs across 2 nodes and 2 addresses across 2 other nodes.
If one of the latter nodes is unhealthy and then becomes healthy
again, an IP isn't failed back.  This is because the nodes in the 1st
group are >= unbalanced then the nodes in the 2nd group.

Signed-off-by: Martin Schwenke <martin@meltin.net>

diff --git a/tests/takeover/testcases/lcp2.010.sh b/tests/takeover/testcases/lcp2.010.sh
new file mode 100755 (executable)
index 0000000..c47b652
--- /dev/null
+++ b/tests/takeover/testcases/lcp2.010.sh
@@ -0,0 +1,32 @@
+#!/bin/sh
+
+. "${TAKEOVER_TESTS_DIR}/common.sh"
+
+define_test "2 disjoint groups of nodes/addresses, a node becomes healthy"
+
+# This illustrates a bug in LCP2 when the the only candidate for a
+# source node is chosen to be the "most imbalanced" node.  This means
+# that nodes in the smaller group aren't necessarily (depends on sort
+# order and addresses used) considered as candidates.  If the larger
+# group has 6 addresses then the "necessarily" goes away and the
+# smaller group won't be rebalanced.
+
+export CTDB_TEST_LOGLEVEL=0
+
+required_result <<EOF
+192.168.209.102 3
+192.168.209.101 2
+192.168.140.4 1
+192.168.140.3 1
+192.168.140.2 0
+192.168.140.1 0
+EOF
+
+simple_test 0,0,0,0 <<EOF
+192.168.140.1          0       0,1
+192.168.140.2          0       0,1
+192.168.140.3          1       0,1
+192.168.140.4          1       0,1
+192.168.209.101                2       2,3
+192.168.209.102                2       2,3
+EOF