Erika Ellison created SAMZA-1765:
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Summary: Containers fail to start on YARN with Error: Main method
not found in class SamzaContainer
Key: SAMZA-1765
URL: https://issues.apache.org/jira/browse/SAMZA-1765
Project: Samza
Issue Type: Bug
Components: container, yarn
Affects Versions: 0.14.0, 0.13.0, 0.14.1
Environment: Hadoop/YARN 2.7.4
Reporter: Erika Ellison
This issue is a critical blocker as we try to upgrade to Samza's latest release
0.14.1. I have also tested versions 0.14.0 and 0.13.0, where I saw the same
behavior. The version of Samza we are upgrading from is 0.11.0.
When I deploy a Samza app built against the new versions to YARN, I observe the
following:
Application Manager container gets launched and runs successfully.
AM launches application containers, but the containers crash, before even
samza-container-*.log is created and written to - stderr contains the following:
{code:java}
openjdk version "1.8.0_161"
OpenJDK Runtime Environment (build 1.8.0_161-b14)
OpenJDK 64-Bit Server VM (build 25.161-b14, mixed mode)
Error: Main method not found in class
org.apache.samza.container.SamzaContainer, please define the main method as:
public static void main(String[] args)
or a JavaFX application class must extend javafx.application.Application{code}
Sure enough, looking at version 0.11.0, SamzaContainer.scala used to have a
main method, and in newer versions it does not. Beyond that, I'm not sure where
to start investigating.
It may be worth noting that our Samza apps implement StreamTask, not the newer
API of StreamApplication. There may be some straightforward change required to
run apps implementing the older API on YARN, but I didn't find anything about
that in the documentation.
It may also be helpful to note that I can run Samza apps with the newer version
locally via the LocalThreadJobRunner, and the run loop is successfully entered.
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