Deprecate batch_size parameter on bulk API (opensearch-project#14725)

By default the full _bulk payload will be passed to ingest processors as a
batch, with any sub batching logic to be implemented by each processor if
necessary.

Signed-off-by: Liyun Xiu <xiliyun@amazon.com>

CHANGELOG.md

@@ -61,6 +61,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - Allow system index warning in OpenSearchRestTestCase.refreshAllIndices ([#14635](https://github.com/opensearch-project/OpenSearch/pull/14635))
 
 ### Deprecated
+- Deprecate batch_size parameter on bulk API ([#14725](https://github.com/opensearch-project/OpenSearch/pull/14725))
 
 ### Removed
 - Remove query categorization changes ([#14759](https://github.com/opensearch-project/OpenSearch/pull/14759))

modules/ingest-common/src/yamlRestTest/resources/rest-api-spec/test/ingest/70_bulk.yml

@@ -207,15 +207,14 @@ teardown:
   - match: { _source: {"f1": "v2", "f2": 47, "field1": "value1", "field2": "value2"}}
 
 ---
-"Test bulk API with batch enabled happy case":
+"Test bulk API with default batch size":
   - skip:
       version: " - 2.13.99"
       reason: "Added in 2.14.0"
 
   - do:
       bulk:
         refresh: true
-        batch_size: 2
         pipeline: "pipeline1"
         body:
           - '{"index": {"_index": "test_index", "_id": "test_id1"}}'
@@ -245,36 +244,6 @@ teardown:
         id: test_id3
   - match: { _source: { "text": "text3", "field1": "value1" } }
 
----
-"Test bulk API with batch_size missing":
-  - skip:
-      version: " - 2.13.99"
-      reason: "Added in 2.14.0"
-
-  - do:
-      bulk:
-        refresh: true
-        pipeline: "pipeline1"
-        body:
-          - '{"index": {"_index": "test_index", "_id": "test_id1"}}'
-          - '{"text": "text1"}'
-          - '{"index": {"_index": "test_index", "_id": "test_id2"}}'
-          - '{"text": "text2"}'
-
-  - match: { errors: false }
-
-  - do:
-      get:
-        index: test_index
-        id: test_id1
-  - match: { _source: { "text": "text1", "field1": "value1" } }
-
-  - do:
-      get:
-        index: test_index
-        id: test_id2
-  - match: { _source: { "text": "text2", "field1": "value1" } }
-
 ---
 "Test bulk API with invalid batch_size":
   - skip:

server/src/internalClusterTest/java/org/opensearch/ingest/IngestClientIT.java

@@ -315,6 +315,87 @@ public void testBulkWithUpsert() throws Exception {
         assertThat(upserted.get("processed"), equalTo(true));
     }
 
+    public void testSingleDocIngestFailure() throws Exception {
+        createIndex("test");
+        BytesReference source = BytesReference.bytes(
+            jsonBuilder().startObject()
+                .field("description", "my_pipeline")
+                .startArray("processors")
+                .startObject()
+                .startObject("test")
+                .endObject()
+                .endObject()
+                .endArray()
+                .endObject()
+        );
+        PutPipelineRequest putPipelineRequest = new PutPipelineRequest("_id", source, MediaTypeRegistry.JSON);
+        client().admin().cluster().putPipeline(putPipelineRequest).get();
+
+        GetPipelineRequest getPipelineRequest = new GetPipelineRequest("_id");
+        GetPipelineResponse getResponse = client().admin().cluster().getPipeline(getPipelineRequest).get();
+        assertThat(getResponse.isFound(), is(true));
+        assertThat(getResponse.pipelines().size(), equalTo(1));
+        assertThat(getResponse.pipelines().get(0).getId(), equalTo("_id"));
+
+        assertThrows(
+            IllegalArgumentException.class,
+            () -> client().prepareIndex("test")
+                .setId("1")
+                .setPipeline("_id")
+                .setSource(Requests.INDEX_CONTENT_TYPE, "field", "value", "fail", true)
+                .get()
+        );
+
+        DeletePipelineRequest deletePipelineRequest = new DeletePipelineRequest("_id");
+        AcknowledgedResponse response = client().admin().cluster().deletePipeline(deletePipelineRequest).get();
+        assertThat(response.isAcknowledged(), is(true));
+
+        getResponse = client().admin().cluster().prepareGetPipeline("_id").get();
+        assertThat(getResponse.isFound(), is(false));
+        assertThat(getResponse.pipelines().size(), equalTo(0));
+    }
+
+    public void testSingleDocIngestDrop() throws Exception {
+        createIndex("test");
+        BytesReference source = BytesReference.bytes(
+            jsonBuilder().startObject()
+                .field("description", "my_pipeline")
+                .startArray("processors")
+                .startObject()
+                .startObject("test")
+                .endObject()
+                .endObject()
+                .endArray()
+                .endObject()
+        );
+        PutPipelineRequest putPipelineRequest = new PutPipelineRequest("_id", source, MediaTypeRegistry.JSON);
+        client().admin().cluster().putPipeline(putPipelineRequest).get();
+
+        GetPipelineRequest getPipelineRequest = new GetPipelineRequest("_id");
+        GetPipelineResponse getResponse = client().admin().cluster().getPipeline(getPipelineRequest).get();
+        assertThat(getResponse.isFound(), is(true));
+        assertThat(getResponse.pipelines().size(), equalTo(1));
+        assertThat(getResponse.pipelines().get(0).getId(), equalTo("_id"));
+
+        DocWriteResponse indexResponse = client().prepareIndex("test")
+            .setId("1")
+            .setPipeline("_id")
+            .setSource(Requests.INDEX_CONTENT_TYPE, "field", "value", "drop", true)
+            .get();
+        assertEquals(DocWriteResponse.Result.NOOP, indexResponse.getResult());
+
+        Map<String, Object> doc = client().prepareGet("test", "1").get().getSourceAsMap();
+        assertNull(doc);
+
+        DeletePipelineRequest deletePipelineRequest = new DeletePipelineRequest("_id");
+        AcknowledgedResponse response = client().admin().cluster().deletePipeline(deletePipelineRequest).get();
+        assertThat(response.isAcknowledged(), is(true));
+
+        getResponse = client().admin().cluster().prepareGetPipeline("_id").get();
+        assertThat(getResponse.isFound(), is(false));
+        assertThat(getResponse.pipelines().size(), equalTo(0));
+    }
+
     public void test() throws Exception {
         BytesReference source = BytesReference.bytes(
             jsonBuilder().startObject()

server/src/main/java/org/opensearch/action/bulk/BulkRequest.java

@@ -96,7 +96,7 @@ public class BulkRequest extends ActionRequest implements CompositeIndicesReques
     private String globalRouting;
     private String globalIndex;
     private Boolean globalRequireAlias;
-    private int batchSize = 1;
+    private int batchSize = Integer.MAX_VALUE;
 
     private long sizeInBytes = 0;
 

server/src/main/java/org/opensearch/ingest/IngestService.java

@@ -525,61 +525,7 @@ public void onFailure(Exception e) {
 
             @Override
             protected void doRun() {
-                int batchSize = originalBulkRequest.batchSize();
-                if (shouldExecuteBulkRequestInBatch(originalBulkRequest.requests().size(), batchSize)) {
-                    runBulkRequestInBatch(numberOfActionRequests, actionRequests, onFailure, onCompletion, onDropped, originalBulkRequest);
-                    return;
-                }
-
-                final Thread originalThread = Thread.currentThread();
-                final AtomicInteger counter = new AtomicInteger(numberOfActionRequests);
-                int i = 0;
-                for (DocWriteRequest<?> actionRequest : actionRequests) {
-                    IndexRequest indexRequest = TransportBulkAction.getIndexWriteRequest(actionRequest);
-                    if (indexRequest == null) {
-                        if (counter.decrementAndGet() == 0) {
-                            onCompletion.accept(originalThread, null);
-                        }
-                        assert counter.get() >= 0;
-                        i++;
-                        continue;
-                    }
-                    final String pipelineId = indexRequest.getPipeline();
-                    indexRequest.setPipeline(NOOP_PIPELINE_NAME);
-                    final String finalPipelineId = indexRequest.getFinalPipeline();
-                    indexRequest.setFinalPipeline(NOOP_PIPELINE_NAME);
-                    boolean hasFinalPipeline = true;
-                    final List<String> pipelines;
-                    if (IngestService.NOOP_PIPELINE_NAME.equals(pipelineId) == false
-                        && IngestService.NOOP_PIPELINE_NAME.equals(finalPipelineId) == false) {
-                        pipelines = Arrays.asList(pipelineId, finalPipelineId);
-                    } else if (IngestService.NOOP_PIPELINE_NAME.equals(pipelineId) == false) {
-                        pipelines = Collections.singletonList(pipelineId);
-                        hasFinalPipeline = false;
-                    } else if (IngestService.NOOP_PIPELINE_NAME.equals(finalPipelineId) == false) {
-                        pipelines = Collections.singletonList(finalPipelineId);
-                    } else {
-                        if (counter.decrementAndGet() == 0) {
-                            onCompletion.accept(originalThread, null);
-                        }
-                        assert counter.get() >= 0;
-                        i++;
-                        continue;
-                    }
-
-                    executePipelines(
-                        i,
-                        pipelines.iterator(),
-                        hasFinalPipeline,
-                        indexRequest,
-                        onDropped,
-                        onFailure,
-                        counter,
-                        onCompletion,
-                        originalThread
-                    );
-                    i++;
-                }
+                runBulkRequestInBatch(numberOfActionRequests, actionRequests, onFailure, onCompletion, onDropped, originalBulkRequest);
             }
         });
     }
@@ -635,7 +581,7 @@ private void runBulkRequestInBatch(
             i++;
         }
 
-        int batchSize = originalBulkRequest.batchSize();
+        int batchSize = Math.min(numberOfActionRequests, originalBulkRequest.batchSize());
         List<List<IndexRequestWrapper>> batches = prepareBatches(batchSize, indexRequestWrappers);
         logger.debug("batchSize: {}, batches: {}", batchSize, batches.size());
 
@@ -654,10 +600,6 @@ private void runBulkRequestInBatch(
         }
     }
 
-    private boolean shouldExecuteBulkRequestInBatch(int documentSize, int batchSize) {
-        return documentSize > 1 && batchSize > 1;
-    }
-
     /**
      * IndexRequests are grouped by unique (index + pipeline_ids) before batching.
      * Only IndexRequests in the same group could be batched. It's to ensure batched documents always
@@ -685,7 +627,7 @@ static List<List<IndexRequestWrapper>> prepareBatches(int batchSize, List<IndexR
         }
         List<List<IndexRequestWrapper>> batchedIndexRequests = new ArrayList<>();
         for (Map.Entry<Integer, List<IndexRequestWrapper>> indexRequestsPerKey : indexRequestsPerIndexAndPipelines.entrySet()) {
-            for (int i = 0; i < indexRequestsPerKey.getValue().size(); i += batchSize) {
+            for (int i = 0; i < indexRequestsPerKey.getValue().size(); i += Math.min(indexRequestsPerKey.getValue().size(), batchSize)) {
                 batchedIndexRequests.add(
                     new ArrayList<>(
                         indexRequestsPerKey.getValue().subList(i, i + Math.min(batchSize, indexRequestsPerKey.getValue().size() - i))

server/src/main/java/org/opensearch/rest/action/document/RestBulkAction.java

@@ -38,6 +38,7 @@
 import org.opensearch.action.support.ActiveShardCount;
 import org.opensearch.client.Requests;
 import org.opensearch.client.node.NodeClient;
+import org.opensearch.common.logging.DeprecationLogger;
 import org.opensearch.common.settings.Settings;
 import org.opensearch.rest.BaseRestHandler;
 import org.opensearch.rest.RestRequest;
@@ -66,6 +67,8 @@
 public class RestBulkAction extends BaseRestHandler {
 
     private final boolean allowExplicitIndex;
+    private static final DeprecationLogger deprecationLogger = DeprecationLogger.getLogger(RestBulkAction.class);
+    static final String BATCH_SIZE_DEPRECATED_MESSAGE = "The batch size option in bulk API is deprecated and will be removed in 3.0.";
 
     public RestBulkAction(Settings settings) {
         this.allowExplicitIndex = MULTI_ALLOW_EXPLICIT_INDEX.get(settings);
@@ -97,7 +100,10 @@ public RestChannelConsumer prepareRequest(final RestRequest request, final NodeC
         Boolean defaultRequireAlias = request.paramAsBoolean(DocWriteRequest.REQUIRE_ALIAS, null);
         bulkRequest.timeout(request.paramAsTime("timeout", BulkShardRequest.DEFAULT_TIMEOUT));
         bulkRequest.setRefreshPolicy(request.param("refresh"));
-        bulkRequest.batchSize(request.paramAsInt("batch_size", 1));
+        if (request.hasParam("batch_size")) {
+            deprecationLogger.deprecate("batch_size_deprecation", BATCH_SIZE_DEPRECATED_MESSAGE);
+        }
+        bulkRequest.batchSize(request.paramAsInt("batch_size", Integer.MAX_VALUE));
         bulkRequest.add(
             request.requiredContent(),
             defaultIndex,

server/src/test/java/org/opensearch/ingest/IngestServiceTests.java

@@ -1134,10 +1134,14 @@ public void testBulkRequestExecutionWithFailures() throws Exception {
         Exception error = new RuntimeException();
         doAnswer(args -> {
             @SuppressWarnings("unchecked")
-            BiConsumer<IngestDocument, Exception> handler = (BiConsumer) args.getArguments()[1];
-            handler.accept(null, error);
+            List<IngestDocumentWrapper> ingestDocumentWrappers = (List) args.getArguments()[0];
+            Consumer<List<IngestDocumentWrapper>> handler = (Consumer) args.getArguments()[1];
+            for (IngestDocumentWrapper wrapper : ingestDocumentWrappers) {
+                wrapper.update(wrapper.getIngestDocument(), error);
+            }
+            handler.accept(ingestDocumentWrappers);
             return null;
-        }).when(processor).execute(any(), any());
+        }).when(processor).batchExecute(any(), any());
         IngestService ingestService = createWithProcessors(
             Collections.singletonMap("mock", (factories, tag, description, config) -> processor)
         );
@@ -1192,10 +1196,11 @@ public void testBulkRequestExecution() throws Exception {
         when(processor.getTag()).thenReturn("mockTag");
         doAnswer(args -> {
             @SuppressWarnings("unchecked")
-            BiConsumer<IngestDocument, Exception> handler = (BiConsumer) args.getArguments()[1];
-            handler.accept(RandomDocumentPicks.randomIngestDocument(random()), null);
+            List<IngestDocumentWrapper> ingestDocumentWrappers = (List) args.getArguments()[0];
+            Consumer<List<IngestDocumentWrapper>> handler = (Consumer) args.getArguments()[1];
+            handler.accept(ingestDocumentWrappers);
             return null;
-        }).when(processor).execute(any(), any());
+        }).when(processor).batchExecute(any(), any());
         Map<String, Processor.Factory> map = new HashMap<>(2);
         map.put("mock", (factories, tag, description, config) -> processor);
 
@@ -1957,6 +1962,42 @@ public void testExecuteBulkRequestInBatchWithExceptionAndDropInCallback() {
         verify(mockCompoundProcessor, never()).execute(any(), any());
     }
 
+    public void testExecuteBulkRequestInBatchWithDefaultBatchSize() {
+        CompoundProcessor mockCompoundProcessor = mockCompoundProcessor();
+        IngestService ingestService = createWithProcessors(
+            Collections.singletonMap("mock", (factories, tag, description, config) -> mockCompoundProcessor)
+        );
+        createPipeline("_id", ingestService);
+        BulkRequest bulkRequest = new BulkRequest();
+        IndexRequest indexRequest1 = new IndexRequest("_index").id("_id1").source(emptyMap()).setPipeline("_id").setFinalPipeline("_none");
+        bulkRequest.add(indexRequest1);
+        IndexRequest indexRequest2 = new IndexRequest("_index").id("_id2").source(emptyMap()).setPipeline("_id").setFinalPipeline("_none");
+        bulkRequest.add(indexRequest2);
+        IndexRequest indexRequest3 = new IndexRequest("_index").id("_id3").source(emptyMap()).setPipeline("_none").setFinalPipeline("_id");
+        bulkRequest.add(indexRequest3);
+        IndexRequest indexRequest4 = new IndexRequest("_index").id("_id4").source(emptyMap()).setPipeline("_id").setFinalPipeline("_none");
+        bulkRequest.add(indexRequest4);
+        @SuppressWarnings("unchecked")
+        final Map<Integer, Exception> failureHandler = new HashMap<>();
+        final Map<Thread, Exception> completionHandler = new HashMap<>();
+        final List<Integer> dropHandler = new ArrayList<>();
+        ingestService.executeBulkRequest(
+            4,
+            bulkRequest.requests(),
+            failureHandler::put,
+            completionHandler::put,
+            dropHandler::add,
+            Names.WRITE,
+            bulkRequest
+        );
+        assertTrue(failureHandler.isEmpty());
+        assertTrue(dropHandler.isEmpty());
+        assertEquals(1, completionHandler.size());
+        assertNull(completionHandler.get(Thread.currentThread()));
+        verify(mockCompoundProcessor, times(1)).batchExecute(any(), any());
+        verify(mockCompoundProcessor, never()).execute(any(), any());
+    }
+
     public void testPrepareBatches_same_index_pipeline() {
         IngestService.IndexRequestWrapper wrapper1 = createIndexRequestWrapper("index1", Collections.singletonList("p1"));
         IngestService.IndexRequestWrapper wrapper2 = createIndexRequestWrapper("index1", Collections.singletonList("p1"));