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https://issues.apache.org/jira/browse/NIFI-4975?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16435332#comment-16435332
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ASF GitHub Bot commented on NIFI-4975:
--------------------------------------
Github user MikeThomsen commented on a diff in the pull request:
https://github.com/apache/nifi/pull/2546#discussion_r181038091
--- 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 --
When you call `session.commit()`, it will throw an exception if you keep
the original input flowfile around. So what I had to do was immediate transfer
the original flowfile to REL_ORIGINAL and mark it null.
> Add support for MongoDB GridFS
> ------------------------------
>
> Key: NIFI-4975
> URL: https://issues.apache.org/jira/browse/NIFI-4975
> Project: Apache NiFi
> Issue Type: Improvement
> Reporter: Mike Thomsen
> Assignee: Mike Thomsen
> Priority: Major
>
> [An overview |https://docs.mongodb.com/manual/core/gridfs/]of what GridFS is.
> Basic CRUD processors for handling GridFS should be added to the MongoDB NAR.
>
>
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