Github user mattyb149 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/2546#discussion_r180937862
  
    --- Diff: 
nifi-nar-bundles/nifi-mongodb-bundle/nifi-mongodb-processors/src/main/java/org/apache/nifi/processors/mongodb/QueryHelper.java
 ---
    @@ -0,0 +1,67 @@
    +/*
    + * 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.mongodb;
    +
    +import org.apache.nifi.components.AllowableValue;
    +import org.apache.nifi.components.PropertyDescriptor;
    +import org.apache.nifi.components.Validator;
    +import org.apache.nifi.flowfile.FlowFile;
    +import org.apache.nifi.processor.ProcessContext;
    +import org.apache.nifi.processor.ProcessSession;
    +
    +import java.io.ByteArrayOutputStream;
    +import java.io.IOException;
    +
    +public interface QueryHelper {
    +    AllowableValue MODE_ONE_COMMIT = new AllowableValue("all-at-once", 
"Full Query Fetch",
    +            "Fetch the entire query result and then make it available to 
downstream processors.");
    +    AllowableValue MODE_MANY_COMMITS = new AllowableValue("streaming", 
"Stream Query Results",
    +            "As soon as the query start sending results to the downstream 
processors at regular intervals.");
    +
    +    PropertyDescriptor OPERATION_MODE = new PropertyDescriptor.Builder()
    +            .name("mongo-operation-mode")
    +            .displayName("Operation Mode")
    +            .allowableValues(MODE_ONE_COMMIT, MODE_MANY_COMMITS)
    +            .defaultValue(MODE_ONE_COMMIT.getValue())
    +            .required(true)
    +            .description("This option controls when results are made 
available to downstream processors. If streaming mode is enabled, " +
    +                    "provenance will not be tracked relative to the input 
flowfile if an input flowfile is received and starts the query. In streaming 
mode " +
    --- End diff --
    
    Can you explain why provenance would not be tracked relative to the input 
flowfile? Also perhaps refer to "streaming mode" as "Stream Query Results" for 
consistency with what is presented to the user.


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