Sentinel: new test unit 07 that tests master down conditions.

tests/sentinel/tests/07-down-conditions.tcl

@@ -0,0 +1,68 @@
+# Test conditions where an instance is considered to be down
+
+source "../tests/includes/init-tests.tcl"
+
+proc ensure_master_up {} {
+    wait_for_condition 1000 50 {
+        [dict get [S 4 sentinel master mymaster] flags] eq "master"
+    } else {
+        fail "Master flags are not just 'master'"
+    }
+}
+
+proc ensure_master_down {} {
+    wait_for_condition 1000 50 {
+        [string match *down* \
+            [dict get [S 4 sentinel master mymaster] flags]]
+    } else {
+        fail "Master is not flagged SDOWN"
+    }
+}
+
+test "Crash the majority of Sentinels to prevent failovers for this unit" {
+    for {set id 0} {$id < $quorum} {incr id} {
+        kill_instance sentinel $id
+    }
+}
+
+test "SDOWN is triggered by non-responding but not crashed instance" {
+    lassign [S 4 SENTINEL GET-MASTER-ADDR-BY-NAME mymaster] host port
+    ensure_master_up
+    exec ../../../src/redis-cli -h $host -p $port debug sleep 10 > /dev/null &
+    ensure_master_down
+    ensure_master_up
+}
+
+test "SDOWN is triggered by crashed instance" {
+    lassign [S 4 SENTINEL GET-MASTER-ADDR-BY-NAME mymaster] host port
+    ensure_master_up
+    kill_instance redis 0
+    ensure_master_down
+    restart_instance redis 0
+    ensure_master_up
+}
+
+test "SDOWN is triggered by masters advertising as slaves" {
+    ensure_master_up
+    R 0 slaveof 127.0.0.1 34567
+    ensure_master_down
+    R 0 slaveof no one
+    ensure_master_up
+}
+
+test "SDOWN is triggered by misconfigured instance repling with errors" {
+    ensure_master_up
+    set orig_dir [lindex [R 0 config get dir] 1]
+    set orig_save [lindex [R 0 config get save] 1]
+    # Set dir to / and filename to "tmp" to make sure it will fail.
+    R 0 config set dir /
+    R 0 config set dbfilename tmp
+    R 0 config set save "1000000 1000000"
+    R 0 bgsave
+    ensure_master_down
+    R 0 config set save $orig_save
+    R 0 config set dir $orig_dir
+    R 0 config set dbfilename dump.rdb
+    R 0 bgsave
+    ensure_master_up
+}