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Make ingest executing non blocking (#43361)
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Added an additional method to the Processor interface to allow a
processor implementation to make a non blocking call.

Also added semaphore in order to avoid search thread pools from rejecting
search requests originating from the match processor. This is a temporary workaround.
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@martijnvg
martijnvg authored Jul 1, 2019
1 parent 79ba94f commit 7c42cde
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Showing 22 changed files with 803 additions and 460 deletions.
54 changes: 37 additions & 17 deletions modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/ForEachProcessor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,9 @@
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.function.BiConsumer;

import org.elasticsearch.script.ScriptService;

import static org.elasticsearch.ingest.ConfigurationUtils.newConfigurationException;
Expand Down Expand Up @@ -63,29 +66,46 @@ boolean isIgnoreMissing() {
}

@Override
public IngestDocument execute(IngestDocument ingestDocument) throws Exception {
public void execute(IngestDocument ingestDocument, BiConsumer<IngestDocument, Exception> handler) {
List<?> values = ingestDocument.getFieldValue(field, List.class, ignoreMissing);
if (values == null) {
if (ignoreMissing) {
return ingestDocument;
handler.accept(ingestDocument, null);
} else {
handler.accept(null, new IllegalArgumentException("field [" + field + "] is null, cannot loop over its elements."));
}
throw new IllegalArgumentException("field [" + field + "] is null, cannot loop over its elements.");
} else {
List<Object> newValues = new CopyOnWriteArrayList<>();
innerExecute(0, values, newValues, ingestDocument, handler);
}
List<Object> newValues = new ArrayList<>(values.size());
IngestDocument document = ingestDocument;
for (Object value : values) {
Object previousValue = ingestDocument.getIngestMetadata().put("_value", value);
try {
document = processor.execute(document);
if (document == null) {
return null;
}
} finally {
newValues.add(ingestDocument.getIngestMetadata().put("_value", previousValue));
}
}

void innerExecute(int index, List<?> values, List<Object> newValues, IngestDocument document,
BiConsumer<IngestDocument, Exception> handler) {
if (index == values.size()) {
document.setFieldValue(field, new ArrayList<>(newValues));
handler.accept(document, null);
return;
}
document.setFieldValue(field, newValues);
return document;

Object value = values.get(index);
Object previousValue = document.getIngestMetadata().put("_value", value);
processor.execute(document, (result, e) -> {
if (e != null) {
newValues.add(document.getIngestMetadata().put("_value", previousValue));
handler.accept(null, e);
} else if (result == null) {
handler.accept(null, null);
} else {
newValues.add(document.getIngestMetadata().put("_value", previousValue));
innerExecute(index + 1, values, newValues, document, handler);
}
});
}

@Override
public IngestDocument execute(IngestDocument ingestDocument) throws Exception {
throw new UnsupportedOperationException("this method should not get executed");
}

@Override
Expand Down
27 changes: 12 additions & 15 deletions ...es/ingest-common/src/test/java/org/elasticsearch/ingest/common/ForEachProcessorTests.java
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Original file line number Diff line number Diff line change
Expand Up @@ -53,7 +53,7 @@ public void testExecute() throws Exception {
"_tag", "values", new UppercaseProcessor("_tag", "_ingest._value", false, "_ingest._value"),
false
);
processor.execute(ingestDocument);
processor.execute(ingestDocument, (result, e) -> {});

@SuppressWarnings("unchecked")
List<String> result = ingestDocument.getFieldValue("values", List.class);
Expand All @@ -73,12 +73,9 @@ public void testExecuteWithFailure() throws Exception {
}
});
ForEachProcessor processor = new ForEachProcessor("_tag", "values", testProcessor, false);
try {
processor.execute(ingestDocument);
fail("exception expected");
} catch (RuntimeException e) {
assertThat(e.getMessage(), equalTo("failure"));
}
Exception[] exceptions = new Exception[1];
processor.execute(ingestDocument, (result, e) -> {exceptions[0] = e;});
assertThat(exceptions[0].getMessage(), equalTo("failure"));
assertThat(testProcessor.getInvokedCounter(), equalTo(3));
assertThat(ingestDocument.getFieldValue("values", List.class), equalTo(Arrays.asList("a", "b", "c")));

Expand All @@ -95,7 +92,7 @@ public void testExecuteWithFailure() throws Exception {
"_tag", "values", new CompoundProcessor(false, Arrays.asList(testProcessor), Arrays.asList(onFailureProcessor)),
false
);
processor.execute(ingestDocument);
processor.execute(ingestDocument, (result, e) -> {});
assertThat(testProcessor.getInvokedCounter(), equalTo(3));
assertThat(ingestDocument.getFieldValue("values", List.class), equalTo(Arrays.asList("A", "B", "c")));
}
Expand All @@ -114,7 +111,7 @@ public void testMetaDataAvailable() throws Exception {
id.setFieldValue("_ingest._value.id", id.getSourceAndMetadata().get("_id"));
});
ForEachProcessor processor = new ForEachProcessor("_tag", "values", innerProcessor, false);
processor.execute(ingestDocument);
processor.execute(ingestDocument, (result, e) -> {});

assertThat(innerProcessor.getInvokedCounter(), equalTo(2));
assertThat(ingestDocument.getFieldValue("values.0.index", String.class), equalTo("_index"));
Expand Down Expand Up @@ -142,7 +139,7 @@ public void testRestOfTheDocumentIsAvailable() throws Exception {
"_tag", "values", new SetProcessor("_tag",
new TestTemplateService.MockTemplateScript.Factory("_ingest._value.new_field"),
(model) -> model.get("other")), false);
processor.execute(ingestDocument);
processor.execute(ingestDocument, (result, e) -> {});

assertThat(ingestDocument.getFieldValue("values.0.new_field", String.class), equalTo("value"));
assertThat(ingestDocument.getFieldValue("values.1.new_field", String.class), equalTo("value"));
Expand Down Expand Up @@ -180,7 +177,7 @@ public String getTag() {
);

ForEachProcessor processor = new ForEachProcessor("_tag", "values", innerProcessor, false);
processor.execute(ingestDocument);
processor.execute(ingestDocument, (result, e) -> {});
@SuppressWarnings("unchecked")
List<String> result = ingestDocument.getFieldValue("values", List.class);
assertThat(result.size(), equalTo(numValues));
Expand All @@ -205,7 +202,7 @@ public void testModifyFieldsOutsideArray() throws Exception {
Collections.singletonList(new UppercaseProcessor("_tag_upper", "_ingest._value", false, "_ingest._value")),
Collections.singletonList(new AppendProcessor("_tag", template, (model) -> (Collections.singletonList("added"))))
), false);
processor.execute(ingestDocument);
processor.execute(ingestDocument, (result, e) -> {});

List<?> result = ingestDocument.getFieldValue("values", List.class);
assertThat(result.get(0), equalTo("STRING"));
Expand All @@ -231,7 +228,7 @@ public void testScalarValueAllowsUnderscoreValueFieldToRemainAccessible() throws
TestProcessor processor = new TestProcessor(doc -> doc.setFieldValue("_ingest._value",
doc.getFieldValue("_source._value", String.class)));
ForEachProcessor forEachProcessor = new ForEachProcessor("_tag", "values", processor, false);
forEachProcessor.execute(ingestDocument);
forEachProcessor.execute(ingestDocument, (result, e) -> {});

List<?> result = ingestDocument.getFieldValue("values", List.class);
assertThat(result.get(0), equalTo("new_value"));
Expand Down Expand Up @@ -264,7 +261,7 @@ public void testNestedForEach() throws Exception {
);
ForEachProcessor processor = new ForEachProcessor(
"_tag", "values1", new ForEachProcessor("_tag", "_ingest._value.values2", testProcessor, false), false);
processor.execute(ingestDocument);
processor.execute(ingestDocument, (result, e) -> {});

List<?> result = ingestDocument.getFieldValue("values1.0.values2", List.class);
assertThat(result.get(0), equalTo("ABC"));
Expand All @@ -282,7 +279,7 @@ public void testIgnoreMissing() throws Exception {
IngestDocument ingestDocument = new IngestDocument(originalIngestDocument);
TestProcessor testProcessor = new TestProcessor(doc -> {});
ForEachProcessor processor = new ForEachProcessor("_tag", "_ingest._value", testProcessor, true);
processor.execute(ingestDocument);
processor.execute(ingestDocument, (result, e) -> {});
assertIngestDocument(originalIngestDocument, ingestDocument);
assertThat(testProcessor.getInvokedCounter(), equalTo(0));
}
Expand Down
80 changes: 57 additions & 23 deletions server/src/main/java/org/elasticsearch/action/bulk/TransportBulkAction.java
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,8 @@

package org.elasticsearch.action.bulk;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.message.ParameterizedMessage;
import org.apache.lucene.util.SparseFixedBitSet;
import org.elasticsearch.ElasticsearchParseException;
Expand Down Expand Up @@ -80,6 +82,7 @@
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicIntegerArray;
import java.util.function.LongSupplier;
import java.util.function.Supplier;
import java.util.stream.Collectors;
Expand Down Expand Up @@ -581,14 +584,13 @@ private long relativeTime() {
}

void processBulkIndexIngestRequest(Task task, BulkRequest original, ActionListener<BulkResponse> listener) {
long ingestStartTimeInNanos = System.nanoTime();
BulkRequestModifier bulkRequestModifier = new BulkRequestModifier(original);
ingestService.executeBulkRequest(() -> bulkRequestModifier,
(indexRequest, exception) -> {
logger.debug(() -> new ParameterizedMessage("failed to execute pipeline [{}] for document [{}/{}/{}]",
indexRequest.getPipeline(), indexRequest.index(), indexRequest.type(), indexRequest.id()), exception);
bulkRequestModifier.markCurrentItemAsFailed(exception);
}, (exception) -> {
final long ingestStartTimeInNanos = System.nanoTime();
final BulkRequestModifier bulkRequestModifier = new BulkRequestModifier(original);
ingestService.executeBulkRequest(
original.numberOfActions(),
() -> bulkRequestModifier,
bulkRequestModifier::markItemAsFailed,
(originalThread, exception) -> {
if (exception != null) {
logger.error("failed to execute pipeline for a bulk request", exception);
listener.onFailure(exception);
Expand All @@ -603,26 +605,56 @@ void processBulkIndexIngestRequest(Task task, BulkRequest original, ActionListen
// (this will happen if pre-processing all items in the bulk failed)
actionListener.onResponse(new BulkResponse(new BulkItemResponse[0], 0));
} else {
doExecute(task, bulkRequest, actionListener);
// If a processor went async and returned a response on a different thread then
// before we continue the bulk request we should fork back on a write thread:
if (originalThread == Thread.currentThread()) {
assert Thread.currentThread().getName().contains(ThreadPool.Names.WRITE);
doExecute(task, bulkRequest, actionListener);
} else {
threadPool.executor(ThreadPool.Names.WRITE).execute(new AbstractRunnable() {
@Override
public void onFailure(Exception e) {
listener.onFailure(e);
}

@Override
protected void doRun() throws Exception {
doExecute(task, bulkRequest, actionListener);
}

@Override
public boolean isForceExecution() {
// If we fork back to a write thread we **not** should fail, because tp queue is full.
// (Otherwise the work done during ingest will be lost)
// It is okay to force execution here. Throttling of write requests happens prior to
// ingest when a node receives a bulk request.
return true;
}
});
}
}
}
},
indexRequest -> bulkRequestModifier.markCurrentItemAsDropped());
bulkRequestModifier::markItemAsDropped
);
}

static final class BulkRequestModifier implements Iterator<DocWriteRequest<?>> {

private static final Logger LOGGER = LogManager.getLogger(BulkRequestModifier.class);

final BulkRequest bulkRequest;
final SparseFixedBitSet failedSlots;
final List<BulkItemResponse> itemResponses;
final AtomicIntegerArray originalSlots;

int currentSlot = -1;
int[] originalSlots;
volatile int currentSlot = -1;

BulkRequestModifier(BulkRequest bulkRequest) {
this.bulkRequest = bulkRequest;
this.failedSlots = new SparseFixedBitSet(bulkRequest.requests().size());
this.itemResponses = new ArrayList<>(bulkRequest.requests().size());
this.originalSlots = new AtomicIntegerArray(bulkRequest.requests().size()); // oversize, but that's ok
}

@Override
Expand All @@ -646,12 +678,11 @@ BulkRequest getBulkRequest() {

int slot = 0;
List<DocWriteRequest<?>> requests = bulkRequest.requests();
originalSlots = new int[requests.size()]; // oversize, but that's ok
for (int i = 0; i < requests.size(); i++) {
DocWriteRequest<?> request = requests.get(i);
if (failedSlots.get(i) == false) {
modifiedBulkRequest.add(request);
originalSlots[slot++] = i;
originalSlots.set(slot++, i);
}
}
return modifiedBulkRequest;
Expand All @@ -666,7 +697,7 @@ ActionListener<BulkResponse> wrapActionListenerIfNeeded(long ingestTookInMillis,
return ActionListener.delegateFailure(actionListener, (delegatedListener, response) -> {
BulkItemResponse[] items = response.getItems();
for (int i = 0; i < items.length; i++) {
itemResponses.add(originalSlots[i], response.getItems()[i]);
itemResponses.add(originalSlots.get(i), response.getItems()[i]);
}
delegatedListener.onResponse(
new BulkResponse(
Expand All @@ -675,11 +706,11 @@ ActionListener<BulkResponse> wrapActionListenerIfNeeded(long ingestTookInMillis,
}
}

void markCurrentItemAsDropped() {
IndexRequest indexRequest = getIndexWriteRequest(bulkRequest.requests().get(currentSlot));
failedSlots.set(currentSlot);
synchronized void markItemAsDropped(int slot) {
IndexRequest indexRequest = getIndexWriteRequest(bulkRequest.requests().get(slot));
failedSlots.set(slot);
itemResponses.add(
new BulkItemResponse(currentSlot, indexRequest.opType(),
new BulkItemResponse(slot, indexRequest.opType(),
new UpdateResponse(
new ShardId(indexRequest.index(), IndexMetaData.INDEX_UUID_NA_VALUE, 0),
indexRequest.type(), indexRequest.id(), indexRequest.version(), DocWriteResponse.Result.NOOP
Expand All @@ -688,16 +719,19 @@ void markCurrentItemAsDropped() {
);
}

void markCurrentItemAsFailed(Exception e) {
IndexRequest indexRequest = getIndexWriteRequest(bulkRequest.requests().get(currentSlot));
synchronized void markItemAsFailed(int slot, Exception e) {
IndexRequest indexRequest = getIndexWriteRequest(bulkRequest.requests().get(slot));
LOGGER.debug(() -> new ParameterizedMessage("failed to execute pipeline [{}] for document [{}/{}/{}]",
indexRequest.getPipeline(), indexRequest.index(), indexRequest.type(), indexRequest.id()), e);

// We hit a error during preprocessing a request, so we:
// 1) Remember the request item slot from the bulk, so that we're done processing all requests we know what failed
// 2) Add a bulk item failure for this request
// 3) Continue with the next request in the bulk.
failedSlots.set(currentSlot);
failedSlots.set(slot);
BulkItemResponse.Failure failure = new BulkItemResponse.Failure(indexRequest.index(), indexRequest.type(),
indexRequest.id(), e);
itemResponses.add(new BulkItemResponse(currentSlot, indexRequest.opType(), failure));
itemResponses.add(new BulkItemResponse(slot, indexRequest.opType(), failure));
}

}
Expand Down
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