Clear cache: allow to invalidate specific filter cache keys

closes #2653

src/main/java/org/elasticsearch/action/admin/indices/cache/clear/ClearIndicesCacheRequest.java

@@ -35,6 +35,7 @@ public class ClearIndicesCacheRequest extends BroadcastOperationRequest<ClearInd
     private boolean fieldDataCache = false;
     private boolean idCache = false;
     private String[] fields = null;
+    private String[] filterKeys = null;
 
     ClearIndicesCacheRequest() {
     }
@@ -72,6 +73,15 @@ public class ClearIndicesCacheRequest extends BroadcastOperationRequest<ClearInd
         return this.fields;
     }
 
+    public ClearIndicesCacheRequest filterKeys(String... filterKeys) {
+        this.filterKeys = filterKeys;
+        return this;
+    }
+
+    public String[] filterKeys() {
+        return this.filterKeys;
+    }
+
     public boolean idCache() {
         return this.idCache;
     }
@@ -86,13 +96,8 @@ public class ClearIndicesCacheRequest extends BroadcastOperationRequest<ClearInd
         filterCache = in.readBoolean();
         fieldDataCache = in.readBoolean();
         idCache = in.readBoolean();
-        int size = in.readVInt();
-        if (size > 0) {
-            fields = new String[size];
-            for (int i = 0; i < size; i++) {
-                fields[i] = in.readString();
-            }
-        }
+        fields = in.readStringArray();
+        filterKeys = in.readStringArray();
     }
 
     public void writeTo(StreamOutput out) throws IOException {
@@ -100,13 +105,7 @@ public class ClearIndicesCacheRequest extends BroadcastOperationRequest<ClearInd
         out.writeBoolean(filterCache);
         out.writeBoolean(fieldDataCache);
         out.writeBoolean(idCache);
-        if (fields == null) {
-            out.writeVInt(0);
-        } else {
-            out.writeVInt(fields.length);
-            for (String field : fields) {
-                out.writeString(field);
-            }
-        }
+        out.writeStringArrayNullable(fields);
+        out.writeStringArrayNullable(filterKeys);
     }
 }

src/main/java/org/elasticsearch/action/admin/indices/cache/clear/ClearIndicesCacheRequestBuilder.java

@@ -48,6 +48,11 @@ public class ClearIndicesCacheRequestBuilder extends BroadcastOperationRequestBu
         return this;
     }
 
+    public ClearIndicesCacheRequestBuilder setFilterKeys(String... filterKeys) {
+        request.filterKeys(filterKeys);
+        return this;
+    }
+
     public ClearIndicesCacheRequestBuilder setIdCache(boolean idCache) {
         request.idCache(idCache);
         return this;

src/main/java/org/elasticsearch/action/admin/indices/cache/clear/ShardClearIndicesCacheRequest.java

@@ -34,6 +34,7 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
     private boolean fieldDataCache = false;
     private boolean idCache = false;
     private String[] fields = null;
+    private String[] filterKeys = null;
 
     ShardClearIndicesCacheRequest() {
     }
@@ -44,6 +45,7 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
         fieldDataCache = request.fieldDataCache();
         idCache = request.idCache();
         fields = request.fields();
+        filterKeys = request.filterKeys();
     }
 
     public boolean filterCache() {
@@ -62,6 +64,10 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
         return this.fields;
     }
 
+    public String[] filterKeys() {
+        return this.filterKeys;
+    }
+
     public ShardClearIndicesCacheRequest waitForOperations(boolean waitForOperations) {
         this.filterCache = waitForOperations;
         return this;
@@ -73,13 +79,8 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
         filterCache = in.readBoolean();
         fieldDataCache = in.readBoolean();
         idCache = in.readBoolean();
-        int size = in.readVInt();
-        if (size > 0) {
-            fields = new String[size];
-            for (int i = 0; i < size; i++) {
-                fields[i] = in.readString();
-            }
-        }
+        fields = in.readStringArray();
+        filterKeys = in.readStringArray();
     }
 
     @Override
@@ -88,13 +89,7 @@ class ShardClearIndicesCacheRequest extends BroadcastShardOperationRequest {
         out.writeBoolean(filterCache);
         out.writeBoolean(fieldDataCache);
         out.writeBoolean(idCache);
-        if (fields == null) {
-            out.writeVInt(0);
-        } else {
-            out.writeVInt(fields.length);
-            for (String field : fields) {
-                out.writeString(field);
-            }
-        }
+        out.writeStringArrayNullable(fields);
+        out.writeStringArrayNullable(filterKeys);
     }
 }

src/main/java/org/elasticsearch/action/admin/indices/cache/clear/TransportClearIndicesCacheAction.java

@@ -124,6 +124,10 @@ public class TransportClearIndicesCacheAction extends TransportBroadcastOperatio
                 clearedAtLeastOne = true;
                 service.cache().filter().clear("api");
             }
+            if (request.filterKeys() != null && request.filterKeys().length > 0) {
+                clearedAtLeastOne = true;
+                service.cache().filter().clear("api", request.filterKeys());
+            }
             if (request.fieldDataCache()) {
                 clearedAtLeastOne = true;
                 if (request.fields() == null || request.fields().length == 0) {

src/main/java/org/elasticsearch/index/cache/filter/FilterCache.java

@@ -47,6 +47,8 @@ public interface FilterCache extends IndexComponent, CloseableComponent {
 
     void clear(String reason);
 
+    void clear(String reason, String[] keys);
+
     EntriesStats entriesStats();
 
     long evictions();

src/main/java/org/elasticsearch/index/cache/filter/none/NoneFilterCache.java

@@ -59,6 +59,11 @@ public class NoneFilterCache extends AbstractIndexComponent implements FilterCac
         // nothing to do here
     }
 
+    @Override
+    public void clear(String reason, String[] keys) {
+        // nothing to do there
+    }
+
     @Override
     public void clear(IndexReader reader) {
         // nothing to do here

src/main/java/org/elasticsearch/index/cache/filter/weighted/WeightedFilterCache.java

@@ -88,6 +88,16 @@ public class WeightedFilterCache extends AbstractIndexComponent implements Filte
         }
     }
 
+    @Override
+    public void clear(String reason, String[] keys) {
+        logger.debug("clear keys [], reason [{}]", reason, keys);
+        for (String key : keys) {
+            for (Object readerKey : seenReaders.keySet()) {
+                indicesFilterCache.cache().invalidate(new FilterCacheKey(this, readerKey, new CacheKeyFilter.Key(key)));
+            }
+        }
+    }
+
     @Override
     public void onClose(SegmentReader owner) {
         clear(owner);

src/main/java/org/elasticsearch/rest/action/admin/indices/cache/clear/RestClearIndicesCacheAction.java

@@ -67,6 +67,7 @@ public class RestClearIndicesCacheAction extends BaseRestHandler {
             clearIndicesCacheRequest.fieldDataCache(request.paramAsBoolean("field_data", clearIndicesCacheRequest.fieldDataCache()));
             clearIndicesCacheRequest.idCache(request.paramAsBoolean("id", clearIndicesCacheRequest.idCache()));
             clearIndicesCacheRequest.fields(request.paramAsStringArray("fields", clearIndicesCacheRequest.fields()));
+            clearIndicesCacheRequest.filterKeys(request.paramAsStringArray("filter_keys", clearIndicesCacheRequest.filterKeys()));
 
             BroadcastOperationThreading operationThreading = BroadcastOperationThreading.fromString(request.param("operationThreading"), BroadcastOperationThreading.SINGLE_THREAD);
             if (operationThreading == BroadcastOperationThreading.NO_THREADS) {

src/test/java/org/elasticsearch/test/integration/indices/cache/ClearCacheTests.java

@@ -0,0 +1,79 @@
+/*
+ * Licensed to ElasticSearch and Shay Banon under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. ElasticSearch licenses this
+ * file to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.elasticsearch.test.integration.indices.cache;
+
+import org.elasticsearch.action.admin.cluster.node.stats.NodesStatsResponse;
+import org.elasticsearch.action.search.SearchResponse;
+import org.elasticsearch.client.Client;
+import org.elasticsearch.common.settings.ImmutableSettings;
+import org.elasticsearch.index.query.FilterBuilders;
+import org.elasticsearch.test.integration.AbstractNodesTests;
+import org.testng.annotations.AfterClass;
+import org.testng.annotations.BeforeClass;
+import org.testng.annotations.Test;
+
+import static org.elasticsearch.index.query.QueryBuilders.filteredQuery;
+import static org.elasticsearch.index.query.QueryBuilders.matchAllQuery;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.equalTo;
+import static org.hamcrest.Matchers.greaterThan;
+
+/**
+ */
+@Test
+public class ClearCacheTests extends AbstractNodesTests {
+
+    private Client client;
+
+    @BeforeClass
+    public void createNodes() throws Exception {
+        startNode("node1", ImmutableSettings.settingsBuilder().put("index.cache.stats.refresh_interval", 0));
+        client = getClient();
+    }
+
+    @AfterClass
+    public void closeNodes() {
+        client.close();
+        closeAllNodes();
+    }
+
+    protected Client getClient() {
+        return client("node1");
+    }
+
+    @Test
+    public void testClearCacheFilterKeys() {
+        client.admin().indices().prepareCreate("test").setSettings(ImmutableSettings.settingsBuilder().put("index.number_of_shards", 1)).execute().actionGet();
+        client.prepareIndex("test", "type", "1").setSource("field", "value").execute().actionGet();
+        client.admin().indices().prepareRefresh().execute().actionGet();
+
+        NodesStatsResponse nodesStats = client.admin().cluster().prepareNodesStats().setIndices(true).execute().actionGet();
+        assertThat(nodesStats.nodes()[0].indices().getCache().filterSizeInBytes(), equalTo(0l));
+
+        SearchResponse searchResponse = client.prepareSearch().setQuery(filteredQuery(matchAllQuery(), FilterBuilders.termFilter("field", "value").cacheKey("test_key"))).execute().actionGet();
+        assertThat(searchResponse.hits().getHits().length, equalTo(1));
+        nodesStats = client.admin().cluster().prepareNodesStats().setIndices(true).execute().actionGet();
+        assertThat(nodesStats.nodes()[0].indices().getCache().filterSizeInBytes(), greaterThan(0l));
+
+        client.admin().indices().prepareClearCache().setFilterKeys("test_key").execute().actionGet();
+        nodesStats = client.admin().cluster().prepareNodesStats().setIndices(true).execute().actionGet();
+        assertThat(nodesStats.nodes()[0].indices().getCache().filterSizeInBytes(), equalTo(0l));
+    }
+}