如何在samza

时间:2015-12-04 03:28:39

标签: apache-kafka apache-samza stream-processing

最近我正在尝试对Samza框架进行一些流处理工作。我已经成功部署了hello-samza示例。但是,当我尝试写自己的工作时,我不知道从哪里开始工作。

我已阅读this document,但我仍然无法明白这一点。所以任何人都可以帮助我:

  1. 我的代码架构(源代码,lib代码和配置)是什么。
  2. 我的代码将被推送到哪个目录。
  3. 我需要做的其他工作才能让我的代码运行。
  4. 你的建议对我很有帮助,非常感谢!

4 个答案:

答案 0 :(得分:3)

构建自己的Jobs非常简单。首先得到你好samza:

git clone https://git.apache.org/samza-hello-samza.git hello-samza

下一步是通过以下命令设置系统:

bin/grid bootstrap

jps

确保一切顺利

下一步是从pom.xml中删除apache-rat-plugin,而不是在hello-samza中构建你的项目。

当你遗憾的是你可以在src文件夹(MyTask.java)中添加一个java文件Job,在config目录中添加一个.properties文件(My.Task.properties)

这是一个示例空作业(MyTask.java)。

package com.samza;
public class MyTask implements StreamTask {
    private static final SystemStream OUTPUT_STREAM = new SystemStream("kafka","topicOut"); 
    public void process (IncomingMessageEnvelope envelope,                  MessageCollector collector,                 
    TaskCoordinator coordinator) throws Exception { 
        // Do something useful
    }
}

不要忘记实现.properties文件。

如果你有非错误代码,请使用maven构建:

mvn clean package
mkdir -p deploy/samza
tar -xvf ./samza-job-package/target/samza-job-package-0.10.0-dist.tar.gz -C deploy/samza

之后,您的服务器已启动(如果不是,您可以./bin/grid start all)启动,则可以deploy/samza/bin/run-job.sh --config-factory=org.apache.samza.config.factories.PropertiesConfigFactory --config-path=file://$PWD/deploy/samza/config/MyTask.properties部署您的作业

并使用kafka客户端消费者的结果 deploy/kafka/bin/kafka-console-consumer.sh --zookeeper localhost:2181 --topic outTopic

答案 1 :(得分:0)

如果您遵循Hello Samza说明,您将在本地计算机上运行功能齐全的Zookeeper,Kafka和Yarn / Samza群集。通过该项目,您可以运行与Wikipedia相关的任务来测试事物。

然而,和你一样,我在为新任务建立正确的目录结构和构建设置时遇到了一些麻烦(没有集群管理的东西)。所以,我通过剥离hello-samza之外的新任务所需的一切来创建hello-samza-base。我在自述文件中包含了有关构建新任务的说明。

就部署而言,这有点复杂。阅读有关创建Zookeeper,Kafka和Yarn集群的内容。

答案 2 :(得分:0)

我通过Maven Eclipse项目创建了Samza作业。版本0.9.2的依赖项,其中包含带有此内容的pom.xml文件(我有一些版本问题,所以你可能会在那里工作):

<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/xsd/maven-4.0.0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>com.acio.samza</groupId>
      <artifactId>samzafroga</artifactId>
      <version>0.0.1</version>
      <name>samzafroga</name>
       <dependencies>
        <dependency>
          <groupId>org.apache.samza</groupId>
          <artifactId>samza-api</artifactId>
        </dependency>
        <dependency>
          <groupId>org.apache.samza</groupId>
          <artifactId>samza-core_2.10</artifactId>
        </dependency>
        <dependency>
          <groupId>org.apache.samza</groupId>
          <artifactId>samza-log4j</artifactId>
        </dependency>
        <dependency>
          <groupId>org.apache.samza</groupId>
          <artifactId>samza-shell</artifactId>
        </dependency>
        <dependency>
          <groupId>org.apache.samza</groupId>
          <artifactId>samza-yarn_2.10</artifactId>
          <exclusions>
            <exclusion>
                <artifactId>jdk.tools</artifactId>
                <groupId>jdk.tools</groupId>
            </exclusion>
        </exclusions>
        </dependency>
        <dependency>
          <groupId>org.apache.samza</groupId>
          <artifactId>samza-kv_2.10</artifactId>
        </dependency>
        <dependency>
          <groupId>org.apache.samza</groupId>
          <artifactId>samza-kv-rocksdb_2.10</artifactId>
        </dependency>
        <dependency>
          <groupId>org.apache.samza</groupId>
          <artifactId>samza-kafka_2.10</artifactId>
        </dependency>
        <dependency>
          <groupId>org.apache.kafka</groupId>
          <artifactId>kafka_2.10</artifactId>
        </dependency>
        <dependency>
          <groupId>org.schwering</groupId>
          <artifactId>irclib</artifactId>
        </dependency>
        <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-api</artifactId>
        </dependency>
        <dependency>
          <groupId>org.slf4j</groupId>
          <artifactId>slf4j-log4j12</artifactId>
        </dependency>
        <dependency>
          <groupId>org.codehaus.jackson</groupId>
          <artifactId>jackson-jaxrs</artifactId>
        </dependency>
        <dependency>
          <groupId>org.apache.hadoop</groupId>
          <artifactId>hadoop-hdfs</artifactId>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-server</artifactId>
            <version>${jettyVersion}</version>
        </dependency>
        <dependency>
            <groupId>org.eclipse.jetty</groupId>
            <artifactId>jetty-webapp</artifactId>
            <version>${jettyVersion}</version>
        </dependency>
       </dependencies>
      <properties>
        <!-- maven specific properties -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <samza.version>0.8.0</samza.version>
        <jettyVersion>7.6.16.v20140903</jettyVersion>
      </properties>
        <repositories>
        <repository>
          <id>apache-releases</id>
          <url>https://repository.apache.org/content/groups/public</url>
        </repository>
        <repository>
          <id>scala-tools.org</id>
          <name>Scala-tools Maven2 Repository</name>
          <url>https://oss.sonatype.org/content/groups/scala-tools</url>
        </repository>
      </repositories>

      <pluginRepositories>
        <pluginRepository>
          <id>scala-tools.org</id>
          <name>Scala-tools Maven2 Repository</name>
          <url>http://scala-tools.org/repo-releases</url>
        </pluginRepository>
      </pluginRepositories>
       <build>
        <pluginManagement>
          <plugins>
            <plugin>
              <groupId>org.apache.rat</groupId>
              <artifactId>apache-rat-plugin</artifactId>
              <version>0.9</version>
              <configuration>
                <excludes>
                  <exclude>*.patch</exclude>
                  <exclude>**/target/**</exclude>
                  <exclude>*.json</exclude>
                  <exclude>.vagrant/**</exclude>
                  <exclude>.git/**</exclude>
                  <exclude>*.md</exclude>
                  <exclude>docs/**</exclude>
                  <exclude>config/**</exclude>
                  <exclude>bin/**</exclude>
                  <exclude>.gitignore</exclude>
                  <exclude>**/.cache/**</exclude>
                  <exclude>deploy/**</exclude>
                  <exclude>**/.project</exclude>
                </excludes>
              </configuration>
             </plugin>
          </plugins>
        </pluginManagement>
        <plugins>

          <!-- plugin to build the tar.gz file filled with examples -->
          <plugin>
            <artifactId>maven-assembly-plugin</artifactId>
            <version>2.3</version>
            <configuration>
              <descriptors>
                <descriptor>src/assembly/bin.xml</descriptor>
              </descriptors>
               <descriptorRefs>
                <descriptorRef>jar-with-dependencies</descriptorRef>
              </descriptorRefs>
            </configuration>
            <executions>
              <execution>
                <id>make-assembly</id>
                <phase>package</phase>
                <goals>
                  <goal>single</goal>
                </goals>
              </execution>
            </executions>
          </plugin>
        </plugins>
      </build>
       <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.apache.samza</groupId>
                <artifactId>samza-api</artifactId>
                <version>${samza.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.samza</groupId>
                <artifactId>samza-core_2.10</artifactId>
                <version>${samza.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.samza</groupId>
                <artifactId>samza-log4j</artifactId>
                <version>${samza.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.samza</groupId>
                <artifactId>samza-shell</artifactId>
                <version>${samza.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.samza</groupId>
                <artifactId>samza-yarn_2.10</artifactId>
                <version>${samza.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.samza</groupId>
                <artifactId>samza-kv_2.10</artifactId>
                <version>${samza.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.samza</groupId>
                <artifactId>samza-kv-rocksdb_2.10</artifactId>
                <version>${samza.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.samza</groupId>
                <artifactId>samza-kafka_2.10</artifactId>
                <version>${samza.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.kafka</groupId>
                <artifactId>kafka_2.10</artifactId>
                <version>0.8.2.0</version>
            </dependency>
            <dependency>
                <groupId>org.schwering</groupId>
                <artifactId>irclib</artifactId>
                <version>1.10</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>1.6.2</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>1.6.2</version>
            </dependency>
            <dependency>
                <groupId>org.codehaus.jackson</groupId>
                <artifactId>jackson-jaxrs</artifactId>
                <version>1.8.5</version>
            </dependency>
            <dependency>
                <groupId>org.apache.hadoop</groupId>
                <artifactId>hadoop-hdfs</artifactId>
                <version>2.6.0</version>
            </dependency>
        </dependencies>
       </dependencyManagement>
    </project>

工作的基本代码就是这个:

package xxxx;

import java.util.Map;

import org.apache.samza.config.Config;
import org.apache.samza.system.IncomingMessageEnvelope;
import org.apache.samza.system.OutgoingMessageEnvelope;
import org.apache.samza.system.SystemStream;
import org.apache.samza.task.MessageCollector;
import org.apache.samza.task.StreamTask;
import org.apache.samza.task.TaskContext;
import org.apache.samza.task.TaskCoordinator;

public class Redirect implements StreamTask {
      private final SystemStream OUTPUT_STREAM = new SystemStream("kafka", "samzaout");

     public void process(IncomingMessageEnvelope envelope,
         MessageCollector collector,
         TaskCoordinator coordinator)
     {
         String msg = (String)envelope.getMessage();
         // Transformation

         String outmsg = "xxx-" + msg + "-xxx";
         collector.send(new OutgoingMessageEnvelope(OUTPUT_STREAM, outmsg));
     }
}

编译完成后,需要将其分组到一个jar文件中,并将其放在一个可访问所有samza节点,web或hdfs的位置。

从您必须创建的属性文件中引用它以启动它。在项目网页中查找示例。

答案 3 :(得分:-2)

再阅读该文档,再看一下hello-samza示例,如果将其部署到YARN,请阅读更多内容。你正在寻找的所有答案都在那里。

hello-samza有三个职位。选择一个并按照它,配置,启动脚本等。

这是来自hello-samza页面如何启动维基百科供稿工作

deploy/samza/bin/run-job.sh --config-factory=org.apache.samza.config.factories.PropertiesConfigFactory --config-path=file://$PWD/deploy/samza/config/wikipedia-feed.properties

属性文件显示编译的作业/任务代码的位置。维基百科供稿工作/任务的源代码在这里:

https://github.com/apache/samza-hello-samza/blob/master/src/main/java/samza/examples/wikipedia/task/WikipediaFeedStreamTask.java

只需修改此作业,或复制和修改,即可开始使用。