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From "Shadi A. Noghabi" <>
Subject Re: Review Request 36006: Writing a tool to read from the coordinator stream and react to config changes accordingly.
Date Tue, 28 Jul 2015 02:39:20 GMT

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(Updated July 28, 2015, 2:39 a.m.)

Review request for samza, Yi Pan (Data Infrastructure), Navina Ramesh, and Naveen Somasundaram.

Repository: samza


After a job is submitted, it might need some configuration change, specifically it might need
more containers. In SAMZA-704 a tool is being added to write to the coordinator stream (CoordinatorStreamWriter).
 This tool can be used to write new configurations to the coordinator stream. However, another
tool (ConfigManager) is needed to read the config changes and react to them, which is the
goal of this task. This tool should be brought up after the job is submitted and read any
config changes added to the coordinator stream, and react to each accordingly. 

This tool, called the Config Manager, is focusing on handling container changs by reacting
to set-config massages with key "yarn.container.count". 

The config manager is a separate standa alone module, that should be brought up separately
after the submission of a job. Therefore, you have to add two configurations to the input
config file:
1. yarn.rm.address= <ip of resource manager in yarn. ex: localhost >
2. yarn.rm.port= <the port of the resource manager http server. ex: 8088 >

The config manger will periodically poll the coordinator stream to see if there are any new
messages. This period is set to 100 ms by deafualt. However, it can be configured by adding
configManager.polling.interval=<polling interval> to the input config file. Thus, overal
the command to run the config manager along with the job would be:

<path to samza deployment>/bin/ --config-factory=<config factory>
--config-path=<path to config file of a job>


  build.gradle 0852adc4e8e0c2816afd1ebf433f1af6b44852f7 
  checkstyle/import-control.xml 6654319392929857bb861d77763afd8a5ea7674c 
  gradle/dependency-versions.gradle fb06e8ed393d1a38abfa1a48fe5244fc7f6c7339 
  samza-autoscaling/src/main/java/org/apache/samza/autoScaling/utils/ PRE-CREATION

  samza-core/src/main/scala/org/apache/samza/job/JobRunner.scala 1c178a661e449c6bdfc4ce431aef9bb2d261a6c2

  samza-shell/src/main/bash/ PRE-CREATION 
  samza-test/src/test/scala/org/apache/samza/test/integration/TestStatefulTask.scala ea702a919348305ff95ce0b4ca1996a13aff04ec

  samza-yarn/src/main/scala/org/apache/samza/job/yarn/SamzaAppMasterService.scala ce88698c12c4bf6f4cf128f92d60b0b9496997d7

  settings.gradle 19bff971ad221084dac10d3f7f3facfa42b829a7 


Testing (updated)

Tested with hello samza and works properly.


Shadi A. Noghabi

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