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https://issues.apache.org/jira/browse/NIFI-856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15261645#comment-15261645
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ASF GitHub Bot commented on NIFI-856:
-------------------------------------
Github user trixpan commented on a diff in the pull request:
https://github.com/apache/nifi/pull/290#discussion_r61381652
--- Diff:
nifi-nar-bundles/nifi-lumberjack-bundle/nifi-lumberjack-processors/src/main/java/org/apache/nifi/processors/lumberjack/event/LumberjackMetadata.java
---
@@ -0,0 +1,26 @@
+/*
+ * 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.lumberjack.event;
+
+/**
+ * Metadata keys for Lumberjack.
+ */
+public interface LumberjackMetadata {
--- End diff --
Good question. Rationale behind it was to follow the RELP pattern put
together by Bryan
https://github.com/apache/nifi/blob/master/nifi-nar-bundles/nifi-standard-bundle/nifi-standard-processors/src/main/java/org/apache/nifi/processors/standard/relp/event/RELPMetadata.java
I would leave as it is.
> Add Processor for Lumberjack protocol
> -------------------------------------
>
> Key: NIFI-856
> URL: https://issues.apache.org/jira/browse/NIFI-856
> Project: Apache NiFi
> Issue Type: New Feature
> Reporter: Mike de Rhino
> Labels: features
> Attachments: NIFI-856.patch
>
>
> It would be great if NIFI could support the [lumberjack
> protocol|https://github.com/elastic/logstash-forwarder/blob/master/PROTOCOL.md]
> so to enable the use of logstash forwarder as a source of data.
> A lot of non Java shops tend to avoid installing Java at data producing nodes
> and instead of Flume they end up using things like kafka, heka, fluentd or
> logstash-forwarded as data shipping mechanisms.
> Kafka is great but its architecture seem to be better focused on multi-DC
> environments instead of multi-branch scenarios (imagine having to manager 80
> Zookeeper quorum, one for each country where you operate?)
> [Heka|https://github.com/mozilla-services/heka] is fine, it has decent
> backpressure buffering but no concept of acknowledgement on the receiving
> side of a TCP stream. If the other end of a TCP stream is capable of
> listening but gets stuck with its messages it will keep spitting data through
> the pipe, oblivious to the woes at the other end.
> Logstash forwarder in the other hand, is a quite simple tool, with a
> reasonable implementation of acknowledgments on the receiving side but... it
> depends on Logstash(and logstash has its own issues).
> It would be great if NIFI could serve as a middle man, receiving lumberjack
> messages and offloading some of the hard work Logstash seems to struggle with
> (e.g. using NIFI to save to HDFS while a downstream Logstash writes into ES).
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