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https://issues.apache.org/jira/browse/NIFI-856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15309210#comment-15309210
]
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_r65298978
--- Diff:
nifi-nar-bundles/nifi-lumberjack-bundle/nifi-lumberjack-processors/src/main/java/org/apache/nifi/processors/lumberjack/ListenLumberjack.java
---
@@ -0,0 +1,237 @@
+/*
+ * 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;
+
+import com.google.gson.Gson;
+import org.apache.nifi.annotation.behavior.InputRequirement;
+import org.apache.nifi.annotation.behavior.WritesAttribute;
+import org.apache.nifi.annotation.behavior.WritesAttributes;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.flowfile.attributes.CoreAttributes;
+import org.apache.nifi.flowfile.attributes.FlowFileAttributeKey;
+import org.apache.nifi.processor.DataUnit;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSession;
+import
org.apache.nifi.processor.util.listen.AbstractListenEventBatchingProcessor;
+import
org.apache.nifi.processor.util.listen.dispatcher.AsyncChannelDispatcher;
+import org.apache.nifi.processor.util.listen.dispatcher.ChannelDispatcher;
+import
org.apache.nifi.processor.util.listen.dispatcher.SocketChannelDispatcher;
+import org.apache.nifi.processor.util.listen.event.EventFactory;
+import org.apache.nifi.processor.util.listen.handler.ChannelHandlerFactory;
+import org.apache.nifi.processor.util.listen.response.ChannelResponder;
+import org.apache.nifi.processor.util.listen.response.ChannelResponse;
+import org.apache.nifi.processors.lumberjack.event.LumberjackEvent;
+import org.apache.nifi.processors.lumberjack.event.LumberjackEventFactory;
+import org.apache.nifi.processors.lumberjack.frame.LumberjackEncoder;
+import
org.apache.nifi.processors.lumberjack.handler.LumberjackSocketChannelHandlerFactory;
+import
org.apache.nifi.processors.lumberjack.response.LumberjackChannelResponse;
+import org.apache.nifi.processors.lumberjack.response.LumberjackResponse;
+import org.apache.nifi.ssl.SSLContextService;
+
+import javax.net.ssl.SSLContext;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.charset.Charset;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Collection;
+import java.util.ArrayList;
+import java.util.concurrent.BlockingQueue;
+
+
+@InputRequirement(InputRequirement.Requirement.INPUT_FORBIDDEN)
+@Tags({"listen", "lumberjack", "tcp", "logs"})
+@CapabilityDescription("Listens for Lumberjack messages being sent to a
given port over TCP. Each message will be " +
+ "acknowledged after successfully writing the message to a
FlowFile. Each FlowFile will contain data " +
+ "portion of one or more Lumberjack frames. In the case where the
Lumberjack frames contain syslog messages, the " +
+ "output of this processor can be sent to a ParseSyslog processor
for further processing.")
+@WritesAttributes({
+ @WritesAttribute(attribute="lumberjack.sender", description="The
sending host of the messages."),
+ @WritesAttribute(attribute="lumberjack.port", description="The
sending port the messages were received over."),
+ @WritesAttribute(attribute="lumberjack.sequencenumber",
description="The sequence number of the message. Only included if <Batch Size>
is 1."),
+ @WritesAttribute(attribute="lumberjack.*", description="The keys
and respective values as sent by the lumberjack producer. Only included if
<Batch Size> is 1."),
+ @WritesAttribute(attribute="mime.type", description="The mime.type
of the content which is text/plain")
+})
+@SeeAlso(classNames = {"org.apache.nifi.processors.standard.ParseSyslog"})
+public class ListenLumberjack extends
AbstractListenEventBatchingProcessor<LumberjackEvent> {
+
+ public static final PropertyDescriptor SSL_CONTEXT_SERVICE = new
PropertyDescriptor.Builder()
--- End diff --
@apiri
Made it required just to provide overall consistency with clients. Will
revisit when v2 support is introduced.
> 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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