Adds Cluster Balance Stats Tests

server/src/test/java/org/elasticsearch/cluster/routing/allocation/allocator/MetricStatsTests.java

@@ -0,0 +1,60 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.cluster.routing.allocation.allocator;
+
+import org.elasticsearch.common.bytes.BytesReference;
+import org.elasticsearch.common.io.stream.Writeable;
+import org.elasticsearch.common.xcontent.XContentHelper;
+import org.elasticsearch.test.AbstractWireSerializingTestCase;
+import org.elasticsearch.xcontent.ToXContent;
+import org.elasticsearch.xcontent.XContentBuilder;
+import org.elasticsearch.xcontent.XContentFactory;
+
+import java.io.IOException;
+import java.util.Map;
+
+import static org.hamcrest.Matchers.equalTo;
+
+public class MetricStatsTests extends AbstractWireSerializingTestCase<ClusterBalanceStats.MetricStats> {
+
+    @Override
+    protected Writeable.Reader<ClusterBalanceStats.MetricStats> instanceReader() {
+        return ClusterBalanceStats.MetricStats::readFrom;
+    }
+
+    @Override
+    protected ClusterBalanceStats.MetricStats createTestInstance() {
+        return createRandomMetricStats();
+    }
+
+    public static ClusterBalanceStats.MetricStats createRandomMetricStats() {
+        return new ClusterBalanceStats.MetricStats(randomDouble(), randomDouble(), randomDouble(), randomDouble(), randomDouble());
+    }
+
+    @Override
+    protected ClusterBalanceStats.MetricStats mutateInstance(ClusterBalanceStats.MetricStats instance) throws IOException {
+        return createTestInstance();
+    }
+
+    public void testToXContent() throws IOException {
+        ClusterBalanceStats.MetricStats stats = createRandomMetricStats();
+
+        XContentBuilder builder = XContentFactory.jsonBuilder();
+        builder = stats.toXContent(builder, ToXContent.EMPTY_PARAMS);
+        // Convert to map for easy assertions
+        Map<String, Object> map = XContentHelper.convertToMap(BytesReference.bytes(builder), false, builder.contentType()).v2();
+
+        assertThat(map.get("total"), equalTo(stats.total()));
+        assertThat(map.get("min"), equalTo(stats.min()));
+        assertThat(map.get("max"), equalTo(stats.max()));
+        assertThat(map.get("average"), equalTo(stats.average()));
+        assertThat(map.get("std_dev"), equalTo(stats.stdDev()));
+    }
+}

server/src/test/java/org/elasticsearch/cluster/routing/allocation/allocator/TierBalanceStatsTests.java

@@ -0,0 +1,113 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.cluster.routing.allocation.allocator;
+
+import org.elasticsearch.common.bytes.BytesReference;
+import org.elasticsearch.common.io.stream.Writeable;
+import org.elasticsearch.common.xcontent.XContentHelper;
+import org.elasticsearch.test.AbstractWireSerializingTestCase;
+import org.elasticsearch.xcontent.ToXContent;
+import org.elasticsearch.xcontent.XContentBuilder;
+import org.elasticsearch.xcontent.XContentFactory;
+
+import java.io.IOException;
+import java.util.Map;
+
+import static org.elasticsearch.cluster.routing.allocation.allocator.MetricStatsTests.createRandomMetricStats;
+import static org.hamcrest.Matchers.containsInAnyOrder;
+
+public class TierBalanceStatsTests extends AbstractWireSerializingTestCase<ClusterBalanceStats.TierBalanceStats> {
+
+    @Override
+    protected Writeable.Reader<ClusterBalanceStats.TierBalanceStats> instanceReader() {
+        return ClusterBalanceStats.TierBalanceStats::readFrom;
+    }
+
+    @Override
+    protected ClusterBalanceStats.TierBalanceStats createTestInstance() {
+        return createRandomTierBalanceStats();
+    }
+
+    private ClusterBalanceStats.TierBalanceStats createRandomTierBalanceStats() {
+        return new ClusterBalanceStats.TierBalanceStats(
+            createRandomMetricStats(),
+            createRandomMetricStats(),
+            createRandomMetricStats(),
+            createRandomMetricStats(),
+            createRandomMetricStats()
+        );
+    }
+
+    @Override
+    protected ClusterBalanceStats.TierBalanceStats mutateInstance(ClusterBalanceStats.TierBalanceStats instance) throws IOException {
+        return createTestInstance();
+    }
+
+    @SuppressWarnings("unchecked")
+    public void testToXContent() throws IOException {
+        ClusterBalanceStats.TierBalanceStats tierBalanceStats = createRandomTierBalanceStats();
+
+        XContentBuilder builder = XContentFactory.jsonBuilder();
+        builder = tierBalanceStats.toXContent(builder, ToXContent.EMPTY_PARAMS);
+        // Convert to map for easy assertions
+        Map<String, Object> map = XContentHelper.convertToMap(BytesReference.bytes(builder), false, builder.contentType()).v2();
+
+        assertThat(
+            map.keySet(),
+            containsInAnyOrder(
+                "shard_count",
+                "undesired_shard_allocation_count",
+                "forecast_write_load",
+                "forecast_disk_usage",
+                "actual_disk_usage"
+            )
+        );
+
+        Map<String, Object> shardCountStats = (Map<String, Object>) map.get("shard_count");
+        assertThat(shardCountStats.keySet(), containsInAnyOrder("total", "average", "min", "max", "std_dev"));
+        assertEquals(shardCountStats.get("total"), tierBalanceStats.shardCount().total());
+        assertEquals(shardCountStats.get("average"), tierBalanceStats.shardCount().average());
+        assertEquals(shardCountStats.get("min"), tierBalanceStats.shardCount().min());
+        assertEquals(shardCountStats.get("max"), tierBalanceStats.shardCount().max());
+        assertEquals(shardCountStats.get("std_dev"), tierBalanceStats.shardCount().stdDev());
+
+        Map<String, Object> undesiredShardAllocationCountStats = (Map<String, Object>) map.get("undesired_shard_allocation_count");
+        assertThat(undesiredShardAllocationCountStats.keySet(), containsInAnyOrder("total", "average", "min", "max", "std_dev"));
+        assertEquals(undesiredShardAllocationCountStats.get("total"), tierBalanceStats.undesiredShardAllocations().total());
+        assertEquals(undesiredShardAllocationCountStats.get("average"), tierBalanceStats.undesiredShardAllocations().average());
+        assertEquals(undesiredShardAllocationCountStats.get("min"), tierBalanceStats.undesiredShardAllocations().min());
+        assertEquals(undesiredShardAllocationCountStats.get("max"), tierBalanceStats.undesiredShardAllocations().max());
+        assertEquals(undesiredShardAllocationCountStats.get("std_dev"), tierBalanceStats.undesiredShardAllocations().stdDev());
+
+        Map<String, Object> forecastWriteLoadStats = (Map<String, Object>) map.get("forecast_write_load");
+        assertThat(forecastWriteLoadStats.keySet(), containsInAnyOrder("total", "average", "min", "max", "std_dev"));
+        assertEquals(forecastWriteLoadStats.get("total"), tierBalanceStats.forecastWriteLoad().total());
+        assertEquals(forecastWriteLoadStats.get("average"), tierBalanceStats.forecastWriteLoad().average());
+        assertEquals(forecastWriteLoadStats.get("min"), tierBalanceStats.forecastWriteLoad().min());
+        assertEquals(forecastWriteLoadStats.get("max"), tierBalanceStats.forecastWriteLoad().max());
+        assertEquals(forecastWriteLoadStats.get("std_dev"), tierBalanceStats.forecastWriteLoad().stdDev());
+
+        Map<String, Object> forecastDiskUsageStats = (Map<String, Object>) map.get("forecast_disk_usage");
+        assertThat(forecastDiskUsageStats.keySet(), containsInAnyOrder("total", "average", "min", "max", "std_dev"));
+        assertEquals(forecastDiskUsageStats.get("total"), tierBalanceStats.forecastShardSize().total());
+        assertEquals(forecastDiskUsageStats.get("average"), tierBalanceStats.forecastShardSize().average());
+        assertEquals(forecastDiskUsageStats.get("min"), tierBalanceStats.forecastShardSize().min());
+        assertEquals(forecastDiskUsageStats.get("max"), tierBalanceStats.forecastShardSize().max());
+        assertEquals(forecastDiskUsageStats.get("std_dev"), tierBalanceStats.forecastShardSize().stdDev());
+
+        Map<String, Object> actualDiskUsageStats = (Map<String, Object>) map.get("actual_disk_usage");
+        assertThat(actualDiskUsageStats.keySet(), containsInAnyOrder("total", "average", "min", "max", "std_dev"));
+        assertEquals(actualDiskUsageStats.get("total"), tierBalanceStats.actualShardSize().total());
+        assertEquals(actualDiskUsageStats.get("average"), tierBalanceStats.actualShardSize().average());
+        assertEquals(actualDiskUsageStats.get("min"), tierBalanceStats.actualShardSize().min());
+        assertEquals(actualDiskUsageStats.get("max"), tierBalanceStats.actualShardSize().max());
+        assertEquals(actualDiskUsageStats.get("std_dev"), tierBalanceStats.actualShardSize().stdDev());
+    }
+}