Ehcache disk caching tier

libs/core/src/main/java/org/opensearch/core/common/bytes/BytesReference.java

@@ -45,6 +45,7 @@
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
+import java.io.Serializable;
 import java.nio.ByteBuffer;
 import java.util.ArrayList;
 
@@ -54,7 +55,7 @@
  * @opensearch.api
  */
 @PublicApi(since = "1.0.0")
-public interface BytesReference extends Comparable<BytesReference>, ToXContentFragment {
+public interface BytesReference extends Comparable<BytesReference>, ToXContentFragment, Serializable {
 
     /**
      * Convert an {@link XContentBuilder} into a BytesReference. This method closes the builder,

server/build.gradle

@@ -158,6 +158,10 @@ dependencies {
   api "com.google.protobuf:protobuf-java:${versions.protobuf}"
   api "jakarta.annotation:jakarta.annotation-api:${versions.jakarta_annotation}"
 
+  // ehcache
+  api "org.ehcache:ehcache:3.10.8" // using 3.3.1 rather than 3.10.8 to test if dependency conflicts are causing my issues
+  api "org.slf4j:slf4j-api:1.7.36"
+
   testImplementation(project(":test:framework")) {
     // tests use the locally compiled version of server
     exclude group: 'org.opensearch', module: 'server'

server/licenses/ehcache-3.10.8.jar.sha1

@@ -0,0 +1 @@
+f0d50ede46609db78413ca7f4250d348a597b101

server/licenses/ehcache-LICENSE.txt

@@ -0,0 +1,201 @@
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+
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server/licenses/ehcache-NOTICE.txt

@@ -0,0 +1,5 @@
+Ehcache V3
+Copyright 2014-2023 Terracotta, Inc.
+
+The product includes software from the Apache Commons Lang project,
+under the Apache License 2.0 (see: org.ehcache.impl.internal.classes.commonslang)

plugins/identity-shiro/licenses/slf4j-api-LICENSE.txt → server/licenses/slf4j-api-LICENSE.txt

@@ -1,4 +1,4 @@
-Copyright (c) 2004-2014 QOS.ch
+Copyright (c) 2004-2022 QOS.ch Sarl (Switzerland)
 All rights reserved.
 
 Permission is hereby granted, free  of charge, to any person obtaining
@@ -19,3 +19,5 @@ NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 OF CONTRACT, TORT OR OTHERWISE,  ARISING FROM, OUT OF OR IN CONNECTION
 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+

server/src/internalClusterTest/java/org/opensearch/indices/IndicesRequestCacheIT.java

@@ -634,6 +634,45 @@ public void testProfileDisableCache() throws Exception {
         }
     }
 
+    public void testCacheWithInvalidation() throws Exception {
+        Client client = client();
+        assertAcked(
+            client.admin()
+                .indices()
+                .prepareCreate("index")
+                .setMapping("k", "type=keyword")
+                .setSettings(
+                    Settings.builder()
+                        .put(IndicesRequestCache.INDEX_CACHE_REQUEST_ENABLED_SETTING.getKey(), true)
+                        .put(IndexMetadata.SETTING_NUMBER_OF_SHARDS, 1)
+                        .put(IndexMetadata.SETTING_NUMBER_OF_REPLICAS, 0)
+                )
+                .get()
+        );
+        indexRandom(true, client.prepareIndex("index").setSource("k", "hello"));
+        ensureSearchable("index");
+        SearchResponse resp = client.prepareSearch("index").setRequestCache(true).setQuery(QueryBuilders.termQuery("k", "hello")).get();
+        assertSearchResponse(resp);
+        OpenSearchAssertions.assertAllSuccessful(resp);
+        assertThat(resp.getHits().getTotalHits().value, equalTo(1L));
+
+        assertCacheState(client, "index", 0, 1);
+        // Index but don't refresh
+        indexRandom(false, client.prepareIndex("index").setSource("k", "hello2"));
+        resp = client.prepareSearch("index").setRequestCache(true).setQuery(QueryBuilders.termQuery("k", "hello")).get();
+        assertSearchResponse(resp);
+        // Should expect hit as here as refresh didn't happen
+        assertCacheState(client, "index", 1, 1);
+
+        // Explicit refresh would invalidate cache
+        refresh();
+        // Hit same query again
+        resp = client.prepareSearch("index").setRequestCache(true).setQuery(QueryBuilders.termQuery("k", "hello")).get();
+        assertSearchResponse(resp);
+        // Should expect miss as key has changed due to change in IndexReader.CacheKey (due to refresh)
+        assertCacheState(client, "index", 1, 2);
+    }
+
     private static void assertCacheState(Client client, String index, long expectedHits, long expectedMisses) {
         RequestCacheStats requestCacheStats = client.admin()
             .indices()
@@ -648,6 +687,7 @@ private static void assertCacheState(Client client, String index, long expectedH
             Arrays.asList(expectedHits, expectedMisses, 0L),
             Arrays.asList(requestCacheStats.getHitCount(), requestCacheStats.getMissCount(), requestCacheStats.getEvictions())
         );
+
     }
 
 }