Cluster test: new unit 05, slave selection.

tests/cluster/tests/05-slave-selection.tcl

@@ -0,0 +1,94 @@
+# Slave selection test
+# Check the algorithm trying to pick the slave with the most complete history.
+
+source "../tests/includes/init-tests.tcl"
+
+# Create a cluster with 5 master and 10 slaves, so that we have 2
+# slaves for each master.
+test "Create a 5 nodes cluster" {
+    create_cluster 5 10
+}
+
+test "Cluster is up" {
+    assert_cluster_state ok
+}
+
+test "The first master has actually two slaves" {
+    assert {[llength [lindex [R 0 role] 2]] == 2}
+}
+
+test {Slaves of #0 are instance #5 and #10 as expected} {
+    set port0 [get_instance_attrib redis 0 port]
+    assert {[lindex [R 5 role] 2] == $port0}
+    assert {[lindex [R 10 role] 2] == $port0}
+}
+
+test "Instance #5 and #10 synced with the master" {
+    wait_for_condition 1000 50 {
+        [RI 5 master_link_status] eq {up} &&
+        [RI 10 master_link_status] eq {up}
+    } else {
+        fail "Instance #5 or #10 master link status is not up"
+    }
+}
+
+set cluster [redis_cluster 127.0.0.1:[get_instance_attrib redis 0 port]]
+
+test "Slaves are both able to receive and acknowledge writes" {
+    for {set j 0} {$j < 100} {incr j} {
+        $cluster set $j $j
+    }
+    assert {[R 0 wait 2 60000] == 2}
+}
+
+test "Write data while slave #10 is paused and can't receive it" {
+    # Stop the slave with a multi/exec transaction so that the master will
+    # be killed as soon as it can accept writes again.
+    R 10 multi
+    R 10 debug sleep 10
+    R 10 client kill 127.0.0.1:$port0
+    R 10 deferred 1
+    R 10 exec
+
+    # Write some data the slave can't receive.
+    for {set j 0} {$j < 100} {incr j} {
+        $cluster set $j $j
+    }
+
+    # Prevent the master from accepting new slaves.
+    # Use a large pause value since we'll kill it anyway.
+    R 0 CLIENT PAUSE 60000
+
+    # Wait for the slave to return available again
+    R 10 deferred 0
+    assert {[R 10 read] eq {OK OK}}
+
+    # Kill the master so that a reconnection will not be possible.
+    kill_instance redis 0
+}
+
+test "Wait for instance #5 (and not #10) to turn into a master" {
+    wait_for_condition 1000 50 {
+        [RI 5 role] eq {master}
+    } else {
+        fail "No failover detected"
+    }
+}
+
+test "Wait for the node #10 to return alive before ending the test" {
+    R 10 ping
+}
+
+test "Cluster should eventually be up again" {
+    assert_cluster_state ok
+}
+
+test "Node #10 should eventaully replicate node #5" {
+    set port5 [get_instance_attrib redis 5 port]
+    wait_for_condition 1000 50 {
+        ([lindex [R 10 role] 2] == $port5) &&
+        ([lindex [R 10 role] 3] eq {connected})
+    } else {
+        fail "#10 didn't became slave of #5"
+    }
+}