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Experimental kafa simple consumer based firehose #1609
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30 changes: 30 additions & 0 deletions
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docs/content/development/kafka-simple-consumer-firehose.md
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--- | ||
layout: doc_page | ||
--- | ||
# KafkaSimpleConsumerFirehose | ||
This is an experimental firehose to ingest data from kafka using kafka simple consumer api. Currently, this firehose would only work inside standalone realtime nodes. | ||
The configuration for KafkaSimpleConsumerFirehose is similar to the KafkaFirehose [Kafka firehose example](realtime-ingestion.html#realtime-specfile), except `firehose` should be replaced with `firehoseV2` like this: | ||
```json | ||
"firehoseV2": { | ||
"type" : "kafka-0.8-v2", | ||
"brokerList" : ["localhost:4443"], | ||
"queueBufferLength":10001, | ||
"resetOffsetToEarliest":"true", | ||
"partitionIdList" : ["0"], | ||
"clientId" : "localclient", | ||
"feed": "wikipedia" | ||
} | ||
``` | ||
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|property|description|required?| | ||
|--------|-----------|---------| | ||
|type|kafka-0.8-v2|yes| | ||
|brokerList|list of the kafka brokers|yes| | ||
|queueBufferLength|the buffer length for kafka message queue|no default(20000)| | ||
|resetOffsetToEarliest|in case of kafkaOffsetOutOfRange error happens, consumer should starts from the earliest or latest message available|true| | ||
|partitionIdList|list of kafka partition ids|yes| | ||
|clientId|the clientId for kafka SimpleConsumer|yes| | ||
|feed|kafka topic|yes| | ||
|
||
For using this firehose at scale and possibly in production, it is recommended to set replication factor to at least three, which means at least three Kafka brokers in the `brokerList`. For a 1*10^4 events per second kafka topic, keeping one partition can work properly, but more partitions could be added if higher throughput is required. | ||
|
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<?xml version="1.0" encoding="UTF-8"?> | ||
<!-- | ||
~ Druid - a distributed column store. | ||
~ Copyright 2012 - 2015 Metamarkets Group Inc. | ||
~ | ||
~ Licensed 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. | ||
--> | ||
|
||
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" | ||
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> | ||
<modelVersion>4.0.0</modelVersion> | ||
<groupId>io.druid.extensions</groupId> | ||
<artifactId>druid-kafka-eight-simple-consumer</artifactId> | ||
<name>druid-kafka-eight-simple-consumer</name> | ||
<description>druid-kafka-eight-simple-consumer</description> | ||
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<parent> | ||
<groupId>io.druid</groupId> | ||
<artifactId>druid</artifactId> | ||
<version>0.8.2-SNAPSHOT</version> | ||
<relativePath>../../pom.xml</relativePath> | ||
</parent> | ||
|
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<dependencies> | ||
<dependency> | ||
<groupId>io.druid</groupId> | ||
<artifactId>druid-api</artifactId> | ||
</dependency> | ||
<dependency> | ||
<groupId>com.metamx</groupId> | ||
<artifactId>emitter</artifactId> | ||
</dependency> | ||
<dependency> | ||
<groupId>org.apache.kafka</groupId> | ||
<artifactId>kafka_2.10</artifactId> | ||
<version>0.8.2.1</version> | ||
<exclusions> | ||
<exclusion> | ||
<groupId>log4j</groupId> | ||
<artifactId>log4j</artifactId> | ||
</exclusion> | ||
<exclusion> | ||
<groupId>org.apache.zookeeper</groupId> | ||
<artifactId>zookeeper</artifactId> | ||
</exclusion> | ||
</exclusions> | ||
</dependency> | ||
<!-- Tests --> | ||
<dependency> | ||
<groupId>junit</groupId> | ||
<artifactId>junit</artifactId> | ||
<scope>test</scope> | ||
</dependency> | ||
</dependencies> | ||
|
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<build> | ||
<plugins> | ||
<plugin> | ||
<artifactId>maven-jar-plugin</artifactId> | ||
<configuration> | ||
<archive> | ||
<manifest> | ||
<addDefaultImplementationEntries>true</addDefaultImplementationEntries> | ||
<addDefaultSpecificationEntries>true</addDefaultSpecificationEntries> | ||
</manifest> | ||
</archive> | ||
</configuration> | ||
</plugin> | ||
</plugins> | ||
</build> | ||
</project> |
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...leConsumer/src/main/java/io/druid/firehose/kafka/KafkaEightSimpleConsumerDruidModule.java
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/* | ||
* Licensed to Metamarkets Group Inc. (Metamarkets) under one | ||
* or more contributor license agreements. See the NOTICE file | ||
* distributed with this work for additional information | ||
* regarding copyright ownership. Metamarkets 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. | ||
*/ | ||
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package io.druid.firehose.kafka; | ||
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import com.fasterxml.jackson.databind.Module; | ||
import com.fasterxml.jackson.databind.jsontype.NamedType; | ||
import com.fasterxml.jackson.databind.module.SimpleModule; | ||
import com.google.common.collect.ImmutableList; | ||
import com.google.inject.Binder; | ||
import io.druid.initialization.DruidModule; | ||
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import java.util.List; | ||
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public class KafkaEightSimpleConsumerDruidModule implements DruidModule | ||
{ | ||
@Override | ||
public List<? extends Module> getJacksonModules() | ||
{ | ||
return ImmutableList.of( | ||
new SimpleModule("KafkaEightSimpleConsumerFirehoseModule").registerSubtypes( | ||
new NamedType(KafkaEightSimpleConsumerFirehoseFactory.class, "kafka-0.8-v2") | ||
) | ||
); | ||
} | ||
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@Override | ||
public void configure(Binder binder) | ||
{ | ||
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} | ||
} |
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(not blocking for this PR) we may need to consider better ways to handle the "different scala version require different artifact IDs" thing.