Github user nickwallen commented on a diff in the pull request:
https://github.com/apache/incubator-metron/pull/449#discussion_r103493583
--- Diff:
metron-analytics/metron-profiler/src/main/java/org/apache/metron/profiler/bolt/KafkaDestinationHandler.java
---
@@ -0,0 +1,106 @@
+/*
+ * 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.metron.profiler.bolt;
+
+import org.apache.commons.lang3.ClassUtils;
+import org.apache.metron.profiler.ProfileMeasurement;
+import org.apache.storm.task.OutputCollector;
+import org.apache.storm.topology.OutputFieldsDeclarer;
+import org.apache.storm.tuple.Fields;
+import org.apache.storm.tuple.Values;
+import org.json.simple.JSONObject;
+
+import java.io.Serializable;
+
+/**
+ * Handles emitting a ProfileMeasurement to the stream which writes
+ * profile measurements to Kafka.
+ */
+public class KafkaDestinationHandler implements DestinationHandler,
Serializable {
+
+ /**
+ * The stream identifier used for this destination;
+ */
+ private String streamId = "kafka";
+
+ /**
+ * The 'source.type' of messages originating from the Profiler.
+ */
+ private String sourceType = "profiler";
+
+ @Override
+ public void declareOutputFields(OutputFieldsDeclarer declarer) {
+ // the kafka writer expects a field named 'message'
+ declarer.declareStream(getStreamId(), new Fields("message"));
+ }
+
+ @Override
+ public void emit(ProfileMeasurement measurement, OutputCollector
collector) {
+
+ JSONObject message = new JSONObject();
+ message.put("profile", measurement.getDefinition().getProfile());
+ message.put("entity", measurement.getEntity());
+ message.put("period", measurement.getPeriod().getPeriod());
+ message.put("period.start",
measurement.getPeriod().getStartTimeMillis());
+ message.put("period.end", measurement.getPeriod().getEndTimeMillis());
+ message.put("timestamp", System.currentTimeMillis());
+ message.put("source.type", sourceType);
+ message.put("is_alert", "true");
+
+ // append each of the triage values to the message
+ measurement.getTriageValues().forEach((key, value) -> {
+
+ if(isValidType(value)) {
+ message.put(key, value);
+
+ } else {
+ throw new IllegalArgumentException(String.format("invalid type for
triage value: profile=%s, entity=%s, key=%s, value=%s",
--- End diff --
@cestella asked...
> Also, if someone tries to submit something that JSON can't handle (like a
stats object), will it get dropped or will an exception occur?
Good question. The type check for the `triage` block occurs here in
`KafkaDestinationHandler`. This is called by `ProfileBuilderBolt.handleTick`
when a tick tuple is received. The `KafkaDestinationHandler` throws an
exception which is then caught and logged by the bolt.
I was originally thinking this was OK, but after looking over this again,
an exception here would impact any of the Profile-Entity pairs being managed by
the same `ProfileBuilderBolt` instance. I was originally thinking that only
the specific problematic profile would be impacted, but this is not the case.
I think I need to change this to log the error and move on to the next
triage expression. Of course, as a user I'd like to know explicitly if I make
this mistake. Hmm... I'll have to noodle on this.
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