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https://reviews.apache.org/r/48280/
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(Updated June 9, 2016, 10:30 a.m.)


Review request for atlas.


Changes
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As described in this 
[comment](https://issues.apache.org/jira/browse/ATLAS-515?focusedCommentId=15320301&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15320301)
 on ATLAS-515, I am changing the approach to initializing Kafka topics from 
being automated to being script driven, where the script can be automated by 
installation tools like Ambari.

Changes in this patch:

* Retains KafkaTopicCreator class with the logic for setting up topics
* Two python scripts - atlas_kafka_setup.py and atlas_kafka_setup_hook.py.
* Changes to pom.xml to include the required dependencies


Bugs: ATLAS-515
    https://issues.apache.org/jira/browse/ATLAS-515


Repository: atlas


Description
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Attached patch provides a method to automatically create Kafka topics 
ATLAS_HOOK and ATLAS_ENTITIES with configured number of replicas.


Diffs (updated)
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  distro/src/bin/atlas_client_cmdline.py f109ad3 
  distro/src/bin/atlas_config.py fab4046 
  distro/src/bin/atlas_kafka_setup.py PRE-CREATION 
  distro/src/bin/atlas_kafka_setup_hook.py PRE-CREATION 
  distro/src/conf/atlas-application.properties 873c1e0 
  distro/src/main/assemblies/standalone-package.xml 1c7b2c5 
  notification/pom.xml b3738db 
  notification/src/main/java/org/apache/atlas/hook/AtlasTopicCreator.java 
PRE-CREATION 
  notification/src/test/java/org/apache/atlas/hook/AtlasTopicCreatorTest.java 
PRE-CREATION 
  pom.xml eac95c8 

Diff: https://reviews.apache.org/r/48280/diff/


Testing
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* Started multiple Kafka brokers on single machine, configured number of 
replicas to be 2, started Atlas server and verified they got created correctly.
* Started multiple Kafka brokers on single machine, configured number of 
replicas to be 2, started Hive hook and verified it created ATLAS_HOOK 
correctly. Then started Atlas server and verified it by-passed ATLAS_HOOK 
creation, but did ATLAS_ENTITIES creation.
* Started one Kafka broker, onfigured number of replicas to be 2, started Atlas 
server and verified it received an exception as expected. But topic could still 
get auto-created and continued.
* Started 2 instances of Atlas server concurrently and verified topic creation 
is working fine.
* Existing UTs/ITs/new UTs pass.


Thanks,

Hemanth Yamijala

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