Fix ignoring existed cluster settings in DataTierAllocationDecider (e…

…lastic#67137)

Relates to elastic#67133.
Seem to elastic#65037.

The main changes of this PR are:

    Modify the construction method of DataTierAllocationDecider, add a param settings like FilterAllocationDecider.
    Create DataTierAllocationDecider in the main method of DataTierMigrationRoutedStep and SetSingleNodeAllocateStep, and the DataTierAllocationDecider is constructed using the cluster settings in the cluster metadata, so the cluster level _tier filters can be seen when executing the steps.
    Add some tests for the change.

x-pack/plugin/autoscaling/src/test/java/org/elasticsearch/xpack/autoscaling/storage/ReactiveStorageDeciderDecisionTests.java

@@ -369,7 +369,7 @@ private static AllocationDeciders createAllocationDeciders(AllocationDecider...
         return new AllocationDeciders(
             Stream.of(
                 Stream.of(extraDeciders),
-                Stream.of(new DataTierAllocationDecider(clusterSettings)),
+                Stream.of(new DataTierAllocationDecider(Settings.EMPTY, clusterSettings)),
                 systemAllocationDeciders.stream()
             ).flatMap(s -> s).collect(Collectors.toList())
         );

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/cluster/routing/allocation/DataTierAllocationDecider.java

@@ -70,11 +70,14 @@ private static void validateTierSetting(String setting) {
         }
     }
 
-    private volatile String clusterRequire = null;
-    private volatile String clusterInclude = null;
-    private volatile String clusterExclude = null;
-
-    public DataTierAllocationDecider(ClusterSettings clusterSettings) {
+    private volatile String clusterRequire;
+    private volatile String clusterInclude;
+    private volatile String clusterExclude;
+
+    public DataTierAllocationDecider(Settings settings, ClusterSettings clusterSettings) {
+        clusterRequire = CLUSTER_ROUTING_REQUIRE_SETTING.get(settings);
+        clusterInclude = CLUSTER_ROUTING_INCLUDE_SETTING.get(settings);
+        clusterExclude = CLUSTER_ROUTING_EXCLUDE_SETTING.get(settings);
         clusterSettings.addSettingsUpdateConsumer(CLUSTER_ROUTING_REQUIRE_SETTING, s -> this.clusterRequire = s);
         clusterSettings.addSettingsUpdateConsumer(CLUSTER_ROUTING_INCLUDE_SETTING, s -> this.clusterInclude = s);
         clusterSettings.addSettingsUpdateConsumer(CLUSTER_ROUTING_EXCLUDE_SETTING, s -> this.clusterExclude = s);

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/XPackPlugin.java

@@ -438,7 +438,7 @@ public Set<DiscoveryNodeRole> getRoles() {
 
     @Override
     public Collection<AllocationDecider> createAllocationDeciders(Settings settings, ClusterSettings clusterSettings) {
-        return Collections.singleton(new DataTierAllocationDecider(clusterSettings));
+        return Collections.singleton(new DataTierAllocationDecider(settings, clusterSettings));
     }
 
     @Override

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ilm/DataTierMigrationRoutedStep.java

@@ -47,12 +47,6 @@ public class DataTierMigrationRoutedStep extends ClusterStateWaitStep {
         ALL_CLUSTER_SETTINGS = allSettings;
     }
 
-    private static final AllocationDeciders ALLOCATION_DECIDERS = new AllocationDeciders(
-        org.elasticsearch.common.collect.List.of(
-            new DataTierAllocationDecider(new ClusterSettings(Settings.EMPTY, ALL_CLUSTER_SETTINGS))
-        )
-    );
-
     DataTierMigrationRoutedStep(StepKey key, StepKey nextStepKey) {
         super(key, nextStepKey);
     }
@@ -64,6 +58,12 @@ public boolean isRetryable() {
 
     @Override
     public Result isConditionMet(Index index, ClusterState clusterState) {
+        AllocationDeciders allocationDeciders = new AllocationDeciders(
+            org.elasticsearch.common.collect.List.of(
+                new DataTierAllocationDecider(clusterState.getMetadata().settings(),
+                    new ClusterSettings(Settings.EMPTY, ALL_CLUSTER_SETTINGS))
+            )
+        );
         IndexMetadata idxMeta = clusterState.metadata().index(index);
         if (idxMeta == null) {
             // Index must have been since deleted, ignore it
@@ -98,7 +98,7 @@ public Result isConditionMet(Index index, ClusterState clusterState) {
             return new Result(true, null);
         }
 
-        int allocationPendingAllShards = getPendingAllocations(index, ALLOCATION_DECIDERS, clusterState);
+        int allocationPendingAllShards = getPendingAllocations(index, allocationDeciders, clusterState);
 
         if (allocationPendingAllShards > 0) {
             String statusMessage = availableDestinationTier.map(

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/ilm/SetSingleNodeAllocateStep.java

@@ -75,7 +75,7 @@ public void performAction(IndexMetadata indexMetadata, ClusterState clusterState
         AllocationDeciders allocationDeciders = new AllocationDeciders(Arrays.asList(
             new FilterAllocationDecider(clusterState.getMetadata().settings(),
                 new ClusterSettings(Settings.EMPTY, ClusterSettings.BUILT_IN_CLUSTER_SETTINGS)),
-            new DataTierAllocationDecider(new ClusterSettings(Settings.EMPTY, ALL_CLUSTER_SETTINGS)),
+            new DataTierAllocationDecider(clusterState.getMetadata().settings(), new ClusterSettings(Settings.EMPTY, ALL_CLUSTER_SETTINGS)),
             new NodeVersionAllocationDecider()
         ));
         final RoutingNodes routingNodes = clusterState.getRoutingNodes();

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/cluster/routing/allocation/DataTierAllocationDeciderTests.java

@@ -53,7 +53,7 @@ public class DataTierAllocationDeciderTests extends ESAllocationTestCase {
     private static final DiscoveryNode DATA_NODE = newNode("node-data", Collections.singleton(DiscoveryNodeRole.DATA_ROLE));
 
     private final ClusterSettings clusterSettings = new ClusterSettings(Settings.EMPTY, ALL_SETTINGS);
-    private final DataTierAllocationDecider decider = new DataTierAllocationDecider(clusterSettings);
+    private final DataTierAllocationDecider decider = new DataTierAllocationDecider(Settings.EMPTY, clusterSettings);
     private final AllocationDeciders allocationDeciders = new AllocationDeciders(
         Arrays.asList(decider,
             new SameShardAllocationDecider(Settings.EMPTY, clusterSettings),
@@ -648,6 +648,59 @@ public void testPreferredTierAvailable() {
             equalTo(Optional.of("data_warm")));
     }
 
+    public void testExistedClusterFilters() {
+        Settings existedSettings = Settings.builder()
+            .put("cluster.routing.allocation.include._tier", "data_hot,data_warm")
+            .put("cluster.routing.allocation.exclude._tier", "data_cold")
+            .build();
+        ClusterSettings clusterSettings = new ClusterSettings(Settings.EMPTY, ALL_SETTINGS);
+        DataTierAllocationDecider dataTierAllocationDecider = new DataTierAllocationDecider(existedSettings, clusterSettings);
+        AllocationDeciders allocationDeciders = new AllocationDeciders(Arrays.asList(dataTierAllocationDecider));
+        AllocationService service = new AllocationService(allocationDeciders,
+            new TestGatewayAllocator(), new BalancedShardsAllocator(Settings.EMPTY), EmptyClusterInfoService.INSTANCE,
+            EmptySnapshotsInfoService.INSTANCE);
+
+        ClusterState clusterState = prepareState(service.reroute(ClusterState.EMPTY_STATE, "initial state"));
+
+        RoutingAllocation allocation = new RoutingAllocation(allocationDeciders, clusterState.getRoutingNodes(), clusterState,
+            null, null, 0);
+        allocation.debugDecision(true);
+        Decision d;
+        RoutingNode node;
+
+        for (DiscoveryNode n : Arrays.asList(HOT_NODE, WARM_NODE)) {
+            node = new RoutingNode(n.getId(), n, shard);
+            d = dataTierAllocationDecider.canAllocate(shard, node, allocation);
+            assertThat(d.type(), equalTo(Decision.Type.YES));
+            d = dataTierAllocationDecider.canRemain(shard, node, allocation);
+            assertThat(d.type(), equalTo(Decision.Type.YES));
+        }
+
+        node = new RoutingNode(DATA_NODE.getId(), DATA_NODE, shard);
+        d = dataTierAllocationDecider.canAllocate(shard, node, allocation);
+        assertThat(d.type(), equalTo(Decision.Type.NO));
+        assertThat(d.getExplanation(),
+            containsString("node matches any cluster setting [cluster.routing.allocation.exclude._tier] " +
+                "tier filters [data_cold]"));
+        d = dataTierAllocationDecider.canRemain(shard, node, allocation);
+        assertThat(d.type(), equalTo(Decision.Type.NO));
+        assertThat(d.getExplanation(),
+            containsString("node matches any cluster setting [cluster.routing.allocation.exclude._tier] " +
+                "tier filters [data_cold]"));
+
+        node = new RoutingNode(COLD_NODE.getId(), COLD_NODE, shard);
+        d = dataTierAllocationDecider.canAllocate(shard, node, allocation);
+        assertThat(d.type(), equalTo(Decision.Type.NO));
+        assertThat(d.getExplanation(),
+            containsString("node does not match any cluster setting [cluster.routing.allocation.include._tier] " +
+                "tier filters [data_hot,data_warm]"));
+        d = dataTierAllocationDecider.canRemain(shard, node, allocation);
+        assertThat(d.type(), equalTo(Decision.Type.NO));
+        assertThat(d.getExplanation(),
+            containsString("node does not match any cluster setting [cluster.routing.allocation.include._tier] " +
+                "tier filters [data_hot,data_warm]"));
+    }
+
     private ClusterState prepareState(ClusterState initialState) {
         return prepareState(initialState, Settings.EMPTY);
     }