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Date: Thu, 9 May 2013 06:13:15 +0000 (UTC)
From: "Ashwanth Fernando (JIRA)" <jira@apache.org>
To: dev@kafka.apache.org
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Subject: [jira] [Updated] (KAFKA-865) Mavenize and separate the client.
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     [ https://issues.apache.org/jira/browse/KAFKA-865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ashwanth Fernando updated KAFKA-865:
------------------------------------

    Description: 
It seems that the java client for Kafka is also bundled with the server JAR file and this is generated using sbt package. This is difficult for java folks to work with because:

1) Many java shops use maven and they want to specify the GAV of kafka in their pom and bang, the client jar and all its dependencies should be added to the application's classpath. I can't do that right now, because I need to run ./sbt eclipse, get the .JAR, add that to my classpath, add a whole lot of dependencies (log4j, slf4j, zkClient and so on) manually, which is a pain. 

There are 90 million maven central uploads/downloads in 2012 alone. Almost all the java shops out there have maven (either central or in house sonatype).

2) Separation of concerns - keeping the server (core) and the client's classes together in same jar file, increases the size of the bundle for a client and also everytime the server's code changes and a release is performed, the client also needs to update their .JAR file. which is not very great. We don't want a ton of clients to update their .JAR file, just because a faster replication strategy for the kafka server cluster changed in a new release.

Action items are to separate the client and server portions of Kafka, add it in a pom along with the compile time dependencies and upload it to Maven Central or if you have a LinkedIn externally exposed Nexus, over there.

This will increase adoption of the Kafka framework.

  was:
It seems that the java client for Kafka is also bundled with the server JAR file and this is generated using sbt package. This is difficult for java folks to work with because:

1) Many java shops use maven (and a lot of them have a Sonatype Nexus repository in house) for dependency management. They want to specify the GAV and bang, the client jar and all its dependencies should be added to the application's classpath. I can't do that right now, because I need to run ./sbt eclipse, get the .JAR, add that to my classpath, add a whole lot of dependencies (log4j, slf4j, zkClient and so on) manually, which is a pain. 

There are 90 million maven central uploads/downloads in 2012 alone. Almost all the java shops out there have maven (either central or in house sonatype).

2) Separation of concerns - keeping the server (core) and the client's classes increases the size of the bundle for the client and also everytime the server's code changes and a release is performed, the client also needs to update their .JAR file. which is not very great. We don't want a ton of clients to update their .JAR file, just because a faster replication strategy for my kafka cluster changed in a new release.

Action items are to separate the client portion of Kafka, add it in a pom along with the compile time dependencies and upload it to Maven Central or if you have a LinkedIn externally exposed Nexus, over there.

This will increase adoption of the Kafka framework.

    
> Mavenize and separate the client.
> ---------------------------------
>
>                 Key: KAFKA-865
>                 URL: https://issues.apache.org/jira/browse/KAFKA-865
>             Project: Kafka
>          Issue Type: Improvement
>          Components: clients
>    Affects Versions: 0.8
>            Reporter: Ashwanth Fernando
>
> It seems that the java client for Kafka is also bundled with the server JAR file and this is generated using sbt package. This is difficult for java folks to work with because:
> 1) Many java shops use maven and they want to specify the GAV of kafka in their pom and bang, the client jar and all its dependencies should be added to the application's classpath. I can't do that right now, because I need to run ./sbt eclipse, get the .JAR, add that to my classpath, add a whole lot of dependencies (log4j, slf4j, zkClient and so on) manually, which is a pain. 
> There are 90 million maven central uploads/downloads in 2012 alone. Almost all the java shops out there have maven (either central or in house sonatype).
> 2) Separation of concerns - keeping the server (core) and the client's classes together in same jar file, increases the size of the bundle for a client and also everytime the server's code changes and a release is performed, the client also needs to update their .JAR file. which is not very great. We don't want a ton of clients to update their .JAR file, just because a faster replication strategy for the kafka server cluster changed in a new release.
> Action items are to separate the client and server portions of Kafka, add it in a pom along with the compile time dependencies and upload it to Maven Central or if you have a LinkedIn externally exposed Nexus, over there.
> This will increase adoption of the Kafka framework.

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