joewitt commented on a change in pull request #4161: Nifi-7285 Add a 
processor:Split and copy content to attributes
URL: https://github.com/apache/nifi/pull/4161#discussion_r398550550
 
 

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 File path: 
nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/SplitAndToAttribute.java
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 @@ -0,0 +1,191 @@
+/*
+ * 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.standard;
+
+import org.apache.nifi.annotation.behavior.*;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.flowfile.FlowFile;
+import org.apache.nifi.flowfile.attributes.CoreAttributes;
+import org.apache.nifi.flowfile.attributes.FragmentAttributes;
+import org.apache.nifi.processor.AbstractProcessor;
+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.schema.access.SchemaNotFoundException;
+import org.apache.nifi.serialization.*;
+import org.apache.nifi.serialization.record.*;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.*;
+
+@EventDriven
+@SupportsBatching
+@InputRequirement(InputRequirement.Requirement.INPUT_REQUIRED)
+@SideEffectFree
+@CapabilityDescription("Read JSON or Avro to Attribute.")
+@Tags({"JSON","Avro", "Split","Attribute"})
+@WritesAttributes({
+        @WritesAttribute(attribute = "mime.type", description = "Sets the 
mime.type attribute to the MIME Type specified by the Record Writer for the 
FlowFiles routed to the 'splits' Relationship."),
+        @WritesAttribute(attribute = "record.count", description = "The number 
of records in the FlowFile. This is added to FlowFiles that are routed to the 
'splits' Relationship."),
+        @WritesAttribute(attribute = "fragment.identifier", description = "All 
split FlowFiles produced from the same parent FlowFile will have the same 
randomly generated UUID added for this attribute"),
+        @WritesAttribute(attribute = "fragment.index", description = "A one-up 
number that indicates the ordering of the split FlowFiles that were created 
from a single parent FlowFile"),
+        @WritesAttribute(attribute = "fragment.count", description = "The 
number of split FlowFiles generated from the parent FlowFile"),
+        @WritesAttribute(attribute = "segment.original.filename ", description 
= "The filename of the parent FlowFile")
+})
+public class SplitAndToAttribute extends AbstractProcessor {
 
 Review comment:
   I am a strong -1 on this proposed processor.  PartitionRecord is likely to 
do what you want already (specify the fields you want extracted). This is 
generally an anti-pattern (needing to split to single entities and also 
extracting the attributes to flowfile attributes).  There needs to be a lot 
more description on what the actual use case is.

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