Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/180#discussion_r50879510
--- Diff:
nifi-nar-bundles/nifi-elasticsearch-bundle/nifi-elasticsearch-processors/src/main/java/org/apache/nifi/processors/elasticsearch/PutElasticsearch.java
---
@@ -0,0 +1,231 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF 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.apache.nifi.processors.elasticsearch;
+
+import org.apache.commons.io.IOUtils;
+import org.apache.nifi.annotation.behavior.EventDriven;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.expression.AttributeExpression;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.logging.ProcessorLog;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.io.InputStreamCallback;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.elasticsearch.ElasticsearchParseException;
+import org.elasticsearch.ElasticsearchTimeoutException;
+import org.elasticsearch.action.bulk.BulkItemResponse;
+import org.elasticsearch.action.bulk.BulkRequestBuilder;
+import org.elasticsearch.action.bulk.BulkResponse;
+
+import org.elasticsearch.client.transport.NoNodeAvailableException;
+import org.elasticsearch.node.NodeClosedException;
+import org.elasticsearch.transport.ReceiveTimeoutTransportException;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+
+@EventDriven
+@Tags({"elasticsearch", "insert", "update", "write", "put"})
+@CapabilityDescription("Writes the contents of a FlowFile to
Elasticsearch")
+public class PutElasticsearch extends AbstractElasticsearchProcessor {
+
+ static final Relationship REL_SUCCESS = new
Relationship.Builder().name("success")
+ .description("All FlowFiles that are written to Elasticsearch
are routed to this relationship").build();
+
+ static final Relationship REL_FAILURE = new
Relationship.Builder().name("failure")
+ .description("All FlowFiles that cannot be written to
Elasticsearch are routed to this relationship").build();
+
+ static final Relationship REL_RETRY = new
Relationship.Builder().name("retry")
+ .description("A FlowFile is routed to this relationship if the
database cannot be updated but attempting the operation again may succeed")
+ .build();
+
+ public static final PropertyDescriptor ID_ATTRIBUTE = new
PropertyDescriptor.Builder()
+ .name("Identifier attribute")
+ .description("The name of the attribute containing the
identifier for each FlowFile")
+ .required(true)
+ .expressionLanguageSupported(false)
+ .addValidator(StandardValidators.NON_EMPTY_VALIDATOR)
+ .build();
+
+ public static final PropertyDescriptor INDEX = new
PropertyDescriptor.Builder()
+ .name("Index")
+ .description("The name of the index to insert into")
+ .required(true)
+ .expressionLanguageSupported(true)
+
.addValidator(StandardValidators.createAttributeExpressionLanguageValidator(
+ AttributeExpression.ResultType.STRING, true))
+ .build();
+
+ public static final PropertyDescriptor TYPE = new
PropertyDescriptor.Builder()
+ .name("Type")
+ .description("The type of this document (used by Elasticsearch
for indexing and searching)")
+ .required(true)
+ .expressionLanguageSupported(true)
+
.addValidator(StandardValidators.createAttributeExpressionLanguageValidator(
+ AttributeExpression.ResultType.STRING, true))
+ .build();
+
+ public static final PropertyDescriptor BATCH_SIZE = new
PropertyDescriptor.Builder()
+ .name("Batch Size")
+ .description("The preferred number of FlowFiles to put to the
database in a single transaction")
+ .required(true)
+ .addValidator(StandardValidators.POSITIVE_INTEGER_VALIDATOR)
+ .defaultValue("100")
+ .build();
+
+
+ @Override
+ public Set<Relationship> getRelationships() {
+ final Set<Relationship> relationships = new HashSet<>();
+ relationships.add(REL_SUCCESS);
+ relationships.add(REL_FAILURE);
+ relationships.add(REL_RETRY);
+ return Collections.unmodifiableSet(relationships);
+ }
+
+ @Override
+ public final List<PropertyDescriptor>
getSupportedPropertyDescriptors() {
+ final List<PropertyDescriptor> descriptors = new ArrayList<>();
+ descriptors.add(CLUSTER_NAME);
+ descriptors.add(HOSTS);
+ descriptors.add(PROP_SSL_CONTEXT_SERVICE);
+ descriptors.add(PROP_SHIELD_LOCATION);
+ descriptors.add(PING_TIMEOUT);
+ descriptors.add(SAMPLER_INTERVAL);
+ descriptors.add(ID_ATTRIBUTE);
+ descriptors.add(INDEX);
+ descriptors.add(TYPE);
+ descriptors.add(BATCH_SIZE);
+
+ return Collections.unmodifiableList(descriptors);
+ }
+
+
+ @Override
+ public void onTrigger(final ProcessContext context, final
ProcessSession session) throws ProcessException {
+ // Create the client if one does not already exist
+ createClient(context);
+ final int batchSize = context.getProperty(BATCH_SIZE).asInteger();
+ final String index =
context.getProperty(INDEX).evaluateAttributeExpressions().getValue();
+ final String id_attribute =
context.getProperty(ID_ATTRIBUTE).getValue();
+ final String docType =
context.getProperty(TYPE).evaluateAttributeExpressions().getValue();
+
+ final List<FlowFile> flowFiles = session.get(batchSize);
+ if (flowFiles.isEmpty()) {
+ return;
+ }
+
+ final ProcessorLog logger = getLogger();
+
+ try {
+ final BulkRequestBuilder bulk = esClient.get().prepareBulk();
+ for (FlowFile file : flowFiles) {
+ final String id = file.getAttribute(id_attribute);
+ if (id == null) {
+ getLogger().error("no value in identifier attribute
{}", new Object[]{id_attribute});
+ throw new ProcessException("No value in identifier
attribute " + id_attribute);
+ }
+ session.read(file, new InputStreamCallback() {
+ @Override
+ public void process(final InputStream in) throws
IOException {
+ String json = IOUtils.toString(in,
StandardCharsets.UTF_8)
+ .replace("\r\n", " ").replace('\n', '
').replace('\r', ' ');
+ bulk.add(esClient.get().prepareIndex(index,
docType, id)
+
.setSource(json.getBytes(StandardCharsets.UTF_8)));
+ }
+ });
+ }
+
+ final BulkResponse response = bulk.execute().actionGet();
+ if (response.hasFailures()) {
+ for (final BulkItemResponse item : response.getItems()) {
+ final FlowFile flowFile =
flowFiles.get(item.getItemId());
+ if (item.isFailed()) {
+ logger.error("Failed to insert {} into
Elasticsearch due to {}",
+ new Object[]{flowFile, item.getFailure()},
new Exception());
+ session.transfer(flowFile, REL_FAILURE);
+
+ } else {
+ session.transfer(flowFile, REL_SUCCESS);
+
+ }
+ }
+ } else {
+ for (final FlowFile flowFile : flowFiles) {
+ session.transfer(flowFile, REL_SUCCESS);
+ }
+ }
+
+
+ } catch (NoNodeAvailableException nne) {
+ logger.error("Failed to insert {} into Elasticsearch No Node
Available {}", new Object[]{nne}, nne);
+ for (final FlowFile flowFile : flowFiles) {
--- End diff --
For each of these cases, we can just call session.transfer(flowFile,
REL_RETRY), rather than iterating over the FlowFiles.
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