Compression Levels Settings for zstd and zstd_no_dict (opensearch-pro…

…ject#8312)

* Enabling compression levels as index settings

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

* addressing review comments

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

* refactoring codec service

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

* index settings assertion

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

* default compression level change in the settings

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>

---------

Signed-off-by: Sarthak Aggarwal <sarthagg@amazon.com>
Signed-off-by: sahil buddharaju <sahilbud@amazon.com>

CHANGELOG.md

@@ -155,6 +155,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Move ZSTD compression codecs out of the sandbox ([#7908](https://github.com/opensearch-project/OpenSearch/pull/7908))
 - Update ZSTD default compression level ([#8471](https://github.com/opensearch-project/OpenSearch/pull/8471))
 - [Search Pipelines] Pass pipeline creation context to processor factories ([#8164](https://github.com/opensearch-project/OpenSearch/pull/8164))
+- Enabling compression levels for zstd and zstd_no_dict ([#8312](https://github.com/opensearch-project/OpenSearch/pull/8312))
 
 
 ### Deprecated

plugins/events-correlation-engine/src/main/java/org/opensearch/plugin/correlation/core/index/codec/CorrelationCodecService.java

@@ -27,7 +27,7 @@ public class CorrelationCodecService extends CodecService {
      * @param codecServiceConfig Generic codec service config
      */
     public CorrelationCodecService(CodecServiceConfig codecServiceConfig) {
-        super(codecServiceConfig.getMapperService(), codecServiceConfig.getLogger());
+        super(codecServiceConfig.getMapperService(), codecServiceConfig.getIndexSettings(), codecServiceConfig.getLogger());
         mapperService = codecServiceConfig.getMapperService();
     }
 

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

@@ -89,7 +89,7 @@ EngineConfig engineConfigWithLargerIndexingMemory(EngineConfig config) {
                 .mergePolicy(config.getMergePolicy())
                 .analyzer(config.getAnalyzer())
                 .similarity(config.getSimilarity())
-                .codecService(new CodecService(null, LogManager.getLogger(IndexingMemoryControllerIT.class)))
+                .codecService(new CodecService(null, indexSettings, LogManager.getLogger(IndexingMemoryControllerIT.class)))
                 .eventListener(config.getEventListener())
                 .queryCache(config.getQueryCache())
                 .queryCachingPolicy(config.getQueryCachingPolicy())

server/src/main/java/org/opensearch/common/settings/IndexScopedSettings.java

@@ -188,6 +188,7 @@ public final class IndexScopedSettings extends AbstractScopedSettings {
                 FsDirectoryFactory.INDEX_LOCK_FACTOR_SETTING,
                 Store.FORCE_RAM_TERM_DICT,
                 EngineConfig.INDEX_CODEC_SETTING,
+                EngineConfig.INDEX_CODEC_COMPRESSION_LEVEL_SETTING,
                 EngineConfig.INDEX_OPTIMIZE_AUTO_GENERATED_IDS,
                 IndexMetadata.SETTING_WAIT_FOR_ACTIVE_SHARDS,
                 IndexSettings.DEFAULT_PIPELINE,

server/src/main/java/org/opensearch/index/codec/CodecService.java

@@ -38,12 +38,15 @@
 import org.apache.lucene.codecs.lucene95.Lucene95Codec.Mode;
 import org.opensearch.common.Nullable;
 import org.opensearch.common.collect.MapBuilder;
+import org.opensearch.index.IndexSettings;
 import org.opensearch.index.codec.customcodecs.ZstdCodec;
 import org.opensearch.index.codec.customcodecs.ZstdNoDictCodec;
 import org.opensearch.index.mapper.MapperService;
 
 import java.util.Map;
 
+import static org.opensearch.index.engine.EngineConfig.INDEX_CODEC_COMPRESSION_LEVEL_SETTING;
+
 /**
  * Since Lucene 4.0 low level index segments are read and written through a
  * codec layer that allows to use use-case specific file formats &
@@ -58,23 +61,27 @@ public class CodecService {
 
     public static final String DEFAULT_CODEC = "default";
     public static final String BEST_COMPRESSION_CODEC = "best_compression";
-    /** the raw unfiltered lucene default. useful for testing */
+    /**
+     * the raw unfiltered lucene default. useful for testing
+     */
     public static final String LUCENE_DEFAULT_CODEC = "lucene_default";
     public static final String ZSTD_CODEC = "zstd";
     public static final String ZSTD_NO_DICT_CODEC = "zstd_no_dict";
 
-    public CodecService(@Nullable MapperService mapperService, Logger logger) {
+    public CodecService(@Nullable MapperService mapperService, IndexSettings indexSettings, Logger logger) {
         final MapBuilder<String, Codec> codecs = MapBuilder.<String, Codec>newMapBuilder();
+        assert null != indexSettings;
+        int compressionLevel = indexSettings.getValue(INDEX_CODEC_COMPRESSION_LEVEL_SETTING);
         if (mapperService == null) {
             codecs.put(DEFAULT_CODEC, new Lucene95Codec());
             codecs.put(BEST_COMPRESSION_CODEC, new Lucene95Codec(Mode.BEST_COMPRESSION));
-            codecs.put(ZSTD_CODEC, new ZstdCodec());
-            codecs.put(ZSTD_NO_DICT_CODEC, new ZstdNoDictCodec());
+            codecs.put(ZSTD_CODEC, new ZstdCodec(compressionLevel));
+            codecs.put(ZSTD_NO_DICT_CODEC, new ZstdNoDictCodec(compressionLevel));
         } else {
             codecs.put(DEFAULT_CODEC, new PerFieldMappingPostingFormatCodec(Mode.BEST_SPEED, mapperService, logger));
             codecs.put(BEST_COMPRESSION_CODEC, new PerFieldMappingPostingFormatCodec(Mode.BEST_COMPRESSION, mapperService, logger));
-            codecs.put(ZSTD_CODEC, new ZstdCodec(mapperService, logger));
-            codecs.put(ZSTD_NO_DICT_CODEC, new ZstdNoDictCodec(mapperService, logger));
+            codecs.put(ZSTD_CODEC, new ZstdCodec(mapperService, logger, compressionLevel));
+            codecs.put(ZSTD_NO_DICT_CODEC, new ZstdNoDictCodec(mapperService, logger, compressionLevel));
         }
         codecs.put(LUCENE_DEFAULT_CODEC, Codec.getDefault());
         for (String codec : Codec.availableCodecs()) {

server/src/main/java/org/opensearch/index/codec/customcodecs/Lucene95CustomStoredFieldsFormat.java

@@ -35,6 +35,7 @@ public class Lucene95CustomStoredFieldsFormat extends StoredFieldsFormat {
     private final CompressionMode zstdNoDictCompressionMode;
 
     private final Lucene95CustomCodec.Mode mode;
+    private final int compressionLevel;
 
     /** default constructor */
     public Lucene95CustomStoredFieldsFormat() {
@@ -58,6 +59,7 @@ public Lucene95CustomStoredFieldsFormat(Lucene95CustomCodec.Mode mode) {
      */
     public Lucene95CustomStoredFieldsFormat(Lucene95CustomCodec.Mode mode, int compressionLevel) {
         this.mode = Objects.requireNonNull(mode);
+        this.compressionLevel = compressionLevel;
         zstdCompressionMode = new ZstdCompressionMode(compressionLevel);
         zstdNoDictCompressionMode = new ZstdNoDictCompressionMode(compressionLevel);
     }
@@ -122,4 +124,8 @@ StoredFieldsFormat impl(Lucene95CustomCodec.Mode mode) {
     Lucene95CustomCodec.Mode getMode() {
         return mode;
     }
+
+    public int getCompressionLevel() {
+        return compressionLevel;
+    }
 }

server/src/main/java/org/opensearch/index/codec/customcodecs/ZstdCodec.java

@@ -32,8 +32,8 @@ public ZstdCodec(int compressionLevel) {
         super(Mode.ZSTD, compressionLevel);
     }
 
-    public ZstdCodec(MapperService mapperService, Logger logger) {
-        super(Mode.ZSTD, DEFAULT_COMPRESSION_LEVEL, mapperService, logger);
+    public ZstdCodec(MapperService mapperService, Logger logger, int compressionLevel) {
+        super(Mode.ZSTD, compressionLevel, mapperService, logger);
     }
 
     /** The name for this codec. */

server/src/main/java/org/opensearch/index/codec/customcodecs/ZstdNoDictCodec.java

@@ -32,8 +32,8 @@ public ZstdNoDictCodec(int compressionLevel) {
         super(Mode.ZSTD_NO_DICT, compressionLevel);
     }
 
-    public ZstdNoDictCodec(MapperService mapperService, Logger logger) {
-        super(Mode.ZSTD_NO_DICT, DEFAULT_COMPRESSION_LEVEL, mapperService, logger);
+    public ZstdNoDictCodec(MapperService mapperService, Logger logger, int compressionLevel) {
+        super(Mode.ZSTD_NO_DICT, compressionLevel, mapperService, logger);
     }
 
     /** The name for this codec. */

server/src/main/java/org/opensearch/index/engine/EngineConfig.java

@@ -143,6 +143,19 @@ public Supplier<RetentionLeases> retentionLeasesSupplier() {
         }
     }, Property.IndexScope, Property.NodeScope);
 
+    /**
+     * Index setting to change the compression level of zstd and zstd_no_dict lucene codecs.
+     * Compression Level gives a trade-off between compression ratio and speed. The higher compression level results in higher compression ratio but slower compression and decompression speeds.
+     * This setting is <b>not</b> realtime updateable.
+     */
+    public static final Setting<Integer> INDEX_CODEC_COMPRESSION_LEVEL_SETTING = Setting.intSetting(
+        "index.codec.compression_level",
+        3,
+        1,
+        6,
+        Property.IndexScope
+    );
+
     /**
      * Configures an index to optimize documents with auto generated ids for append only. If this setting is updated from <code>false</code>
      * to <code>true</code> might not take effect immediately. In other words, disabling the optimization will be immediately applied while

server/src/main/java/org/opensearch/index/shard/IndexShard.java

@@ -368,7 +368,7 @@ public IndexShard(
         assert shardRouting.initializing();
         this.shardRouting = shardRouting;
         final Settings settings = indexSettings.getSettings();
-        this.codecService = new CodecService(mapperService, logger);
+        this.codecService = new CodecService(mapperService, indexSettings, logger);
         this.warmer = warmer;
         this.similarityService = similarityService;
         Objects.requireNonNull(store, "Store must be provided to the index shard");

server/src/test/java/org/opensearch/gateway/PrimaryShardAllocatorTests.java

@@ -60,7 +60,9 @@
 import org.opensearch.common.UUIDs;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.util.set.Sets;
+import org.opensearch.env.Environment;
 import org.opensearch.env.ShardLockObtainFailedException;
+import org.opensearch.index.IndexSettings;
 import org.opensearch.index.codec.CodecService;
 import org.opensearch.index.shard.ShardId;
 import org.opensearch.indices.replication.checkpoint.ReplicationCheckpoint;
@@ -69,6 +71,7 @@
 import org.opensearch.snapshots.SnapshotId;
 import org.opensearch.snapshots.SnapshotShardSizeInfo;
 import org.junit.Before;
+import org.opensearch.test.IndexSettingsModule;
 
 import java.util.Arrays;
 import java.util.Collections;
@@ -803,21 +806,25 @@ public TestAllocator addData(
         }
 
         public TestAllocator addData(DiscoveryNode node, String allocationId, boolean primary) {
+            Settings nodeSettings = Settings.builder().put(Environment.PATH_HOME_SETTING.getKey(), createTempDir()).build();
+            IndexSettings indexSettings = IndexSettingsModule.newIndexSettings("test", nodeSettings);
             return addData(
                 node,
                 allocationId,
                 primary,
-                ReplicationCheckpoint.empty(shardId, new CodecService(null, null).codec("default").getName()),
+                ReplicationCheckpoint.empty(shardId, new CodecService(null, indexSettings, null).codec("default").getName()),
                 null
             );
         }
 
         public TestAllocator addData(DiscoveryNode node, String allocationId, boolean primary, @Nullable Exception storeException) {
+            Settings nodeSettings = Settings.builder().put(Environment.PATH_HOME_SETTING.getKey(), createTempDir()).build();
+            IndexSettings indexSettings = IndexSettingsModule.newIndexSettings("test", nodeSettings);
             return addData(
                 node,
                 allocationId,
                 primary,
-                ReplicationCheckpoint.empty(shardId, new CodecService(null, null).codec("default").getName()),
+                ReplicationCheckpoint.empty(shardId, new CodecService(null, indexSettings, null).codec("default").getName()),
                 storeException
             );
         }

server/src/test/java/org/opensearch/index/codec/CodecTests.java

@@ -83,11 +83,31 @@ public void testBestCompression() throws Exception {
     public void testZstd() throws Exception {
         Codec codec = createCodecService(false).codec("zstd");
         assertStoredFieldsCompressionEquals(Lucene95CustomCodec.Mode.ZSTD, codec);
+        Lucene95CustomStoredFieldsFormat storedFieldsFormat = (Lucene95CustomStoredFieldsFormat) codec.storedFieldsFormat();
+        assertEquals(Lucene95CustomCodec.DEFAULT_COMPRESSION_LEVEL, storedFieldsFormat.getCompressionLevel());
     }
 
     public void testZstdNoDict() throws Exception {
         Codec codec = createCodecService(false).codec("zstd_no_dict");
         assertStoredFieldsCompressionEquals(Lucene95CustomCodec.Mode.ZSTD_NO_DICT, codec);
+        Lucene95CustomStoredFieldsFormat storedFieldsFormat = (Lucene95CustomStoredFieldsFormat) codec.storedFieldsFormat();
+        assertEquals(Lucene95CustomCodec.DEFAULT_COMPRESSION_LEVEL, storedFieldsFormat.getCompressionLevel());
+    }
+
+    public void testZstdWithCompressionLevel() throws Exception {
+        int randomCompressionLevel = randomIntBetween(1, 6);
+        Codec codec = createCodecService(randomCompressionLevel).codec("zstd");
+        assertStoredFieldsCompressionEquals(Lucene95CustomCodec.Mode.ZSTD, codec);
+        Lucene95CustomStoredFieldsFormat storedFieldsFormat = (Lucene95CustomStoredFieldsFormat) codec.storedFieldsFormat();
+        assertEquals(randomCompressionLevel, storedFieldsFormat.getCompressionLevel());
+    }
+
+    public void testZstdNoDictWithCompressionLevel() throws Exception {
+        int randomCompressionLevel = randomIntBetween(1, 6);
+        Codec codec = createCodecService(randomCompressionLevel).codec("zstd_no_dict");
+        assertStoredFieldsCompressionEquals(Lucene95CustomCodec.Mode.ZSTD_NO_DICT, codec);
+        Lucene95CustomStoredFieldsFormat storedFieldsFormat = (Lucene95CustomStoredFieldsFormat) codec.storedFieldsFormat();
+        assertEquals(randomCompressionLevel, storedFieldsFormat.getCompressionLevel());
     }
 
     public void testDefaultMapperServiceNull() throws Exception {
@@ -103,17 +123,25 @@ public void testBestCompressionMapperServiceNull() throws Exception {
     public void testZstdMapperServiceNull() throws Exception {
         Codec codec = createCodecService(true).codec("zstd");
         assertStoredFieldsCompressionEquals(Lucene95CustomCodec.Mode.ZSTD, codec);
+        Lucene95CustomStoredFieldsFormat storedFieldsFormat = (Lucene95CustomStoredFieldsFormat) codec.storedFieldsFormat();
+        assertEquals(Lucene95CustomCodec.DEFAULT_COMPRESSION_LEVEL, storedFieldsFormat.getCompressionLevel());
     }
 
     public void testZstdNoDictMapperServiceNull() throws Exception {
         Codec codec = createCodecService(true).codec("zstd_no_dict");
         assertStoredFieldsCompressionEquals(Lucene95CustomCodec.Mode.ZSTD_NO_DICT, codec);
+        Lucene95CustomStoredFieldsFormat storedFieldsFormat = (Lucene95CustomStoredFieldsFormat) codec.storedFieldsFormat();
+        assertEquals(Lucene95CustomCodec.DEFAULT_COMPRESSION_LEVEL, storedFieldsFormat.getCompressionLevel());
     }
 
     public void testExceptionCodecNull() {
         assertThrows(IllegalArgumentException.class, () -> createCodecService(true).codec(null));
     }
 
+    public void testExceptionIndexSettingsNull() {
+        assertThrows(AssertionError.class, () -> new CodecService(null, null, LogManager.getLogger("test")));
+    }
+
     // write some docs with it, inspect .si to see this was the used compression
     private void assertStoredFieldsCompressionEquals(Lucene95Codec.Mode expected, Codec actual) throws Exception {
         SegmentReader sr = getSegmentReader(actual);
@@ -130,17 +158,29 @@ private void assertStoredFieldsCompressionEquals(Lucene95CustomCodec.Mode expect
     }
 
     private CodecService createCodecService(boolean isMapperServiceNull) throws IOException {
-
+        Settings nodeSettings = Settings.builder().put(Environment.PATH_HOME_SETTING.getKey(), createTempDir()).build();
         if (isMapperServiceNull) {
-            return new CodecService(null, LogManager.getLogger("test"));
+            return new CodecService(null, IndexSettingsModule.newIndexSettings("_na", nodeSettings), LogManager.getLogger("test"));
         }
-        Settings nodeSettings = Settings.builder().put(Environment.PATH_HOME_SETTING.getKey(), createTempDir()).build();
-        IndexSettings settings = IndexSettingsModule.newIndexSettings("_na", nodeSettings);
-        SimilarityService similarityService = new SimilarityService(settings, null, Collections.emptyMap());
-        IndexAnalyzers indexAnalyzers = createTestAnalysis(settings, nodeSettings).indexAnalyzers;
+        return buildCodecService(nodeSettings);
+    }
+
+    private CodecService createCodecService(int randomCompressionLevel) throws IOException {
+        Settings nodeSettings = Settings.builder()
+            .put(Environment.PATH_HOME_SETTING.getKey(), createTempDir())
+            .put("index.codec.compression_level", randomCompressionLevel)
+            .build();
+        return buildCodecService(nodeSettings);
+    }
+
+    private CodecService buildCodecService(Settings nodeSettings) throws IOException {
+
+        IndexSettings indexSettings = IndexSettingsModule.newIndexSettings("_na", nodeSettings);
+        SimilarityService similarityService = new SimilarityService(indexSettings, null, Collections.emptyMap());
+        IndexAnalyzers indexAnalyzers = createTestAnalysis(indexSettings, nodeSettings).indexAnalyzers;
         MapperRegistry mapperRegistry = new MapperRegistry(Collections.emptyMap(), Collections.emptyMap(), MapperPlugin.NOOP_FIELD_FILTER);
         MapperService service = new MapperService(
-            settings,
+            indexSettings,
             indexAnalyzers,
             xContentRegistry(),
             similarityService,
@@ -149,7 +189,7 @@ private CodecService createCodecService(boolean isMapperServiceNull) throws IOEx
             () -> false,
             null
         );
-        return new CodecService(service, LogManager.getLogger("test"));
+        return new CodecService(service, indexSettings, LogManager.getLogger("test"));
     }
 
     private SegmentReader getSegmentReader(Codec codec) throws IOException {
@@ -166,4 +206,5 @@ private SegmentReader getSegmentReader(Codec codec) throws IOException {
         dir.close();
         return sr;
     }
+
 }

server/src/test/java/org/opensearch/index/codec/customcodecs/Lucene95CustomStoredFieldsFormatTests.java

@@ -24,4 +24,24 @@ public void testZstdNoDictLucene95CustomCodecMode() {
         assertEquals(Lucene95CustomCodec.Mode.ZSTD_NO_DICT, lucene95CustomStoredFieldsFormat.getMode());
     }
 
+    public void testZstdModeWithCompressionLevel() {
+        int randomCompressionLevel = randomIntBetween(1, 6);
+        Lucene95CustomStoredFieldsFormat lucene95CustomStoredFieldsFormat = new Lucene95CustomStoredFieldsFormat(
+            Lucene95CustomCodec.Mode.ZSTD,
+            randomCompressionLevel
+        );
+        assertEquals(Lucene95CustomCodec.Mode.ZSTD, lucene95CustomStoredFieldsFormat.getMode());
+        assertEquals(randomCompressionLevel, lucene95CustomStoredFieldsFormat.getCompressionLevel());
+    }
+
+    public void testZstdNoDictLucene95CustomCodecModeWithCompressionLevel() {
+        int randomCompressionLevel = randomIntBetween(1, 6);
+        Lucene95CustomStoredFieldsFormat lucene95CustomStoredFieldsFormat = new Lucene95CustomStoredFieldsFormat(
+            Lucene95CustomCodec.Mode.ZSTD_NO_DICT,
+            randomCompressionLevel
+        );
+        assertEquals(Lucene95CustomCodec.Mode.ZSTD_NO_DICT, lucene95CustomStoredFieldsFormat.getMode());
+        assertEquals(randomCompressionLevel, lucene95CustomStoredFieldsFormat.getCompressionLevel());
+    }
+
 }

server/src/test/java/org/opensearch/index/engine/EngineConfigFactoryTests.java

@@ -178,7 +178,7 @@ public Optional<EngineFactory> getEngineFactory(final IndexSettings indexSetting
 
         @Override
         public Optional<CodecService> getCustomCodecService(IndexSettings indexSettings) {
-            return Optional.of(new CodecService(null, LogManager.getLogger(getClass())));
+            return Optional.of(new CodecService(null, indexSettings, LogManager.getLogger(getClass())));
         }
 
         @Override
@@ -195,7 +195,7 @@ public Optional<EngineFactory> getEngineFactory(final IndexSettings indexSetting
 
         @Override
         public Optional<CodecService> getCustomCodecService(IndexSettings indexSettings) {
-            return Optional.of(new CodecService(null, LogManager.getLogger(getClass())));
+            return Optional.of(new CodecService(null, indexSettings, LogManager.getLogger(getClass())));
         }
     }
 
@@ -207,7 +207,9 @@ public Optional<EngineFactory> getEngineFactory(final IndexSettings indexSetting
 
         @Override
         public Optional<CodecServiceFactory> getCustomCodecServiceFactory(IndexSettings indexSettings) {
-            return Optional.of(config -> new CodecService(config.getMapperService(), LogManager.getLogger(getClass())));
+            return Optional.of(
+                config -> new CodecService(config.getMapperService(), config.getIndexSettings(), LogManager.getLogger(getClass()))
+            );
         }
     }