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https://issues.apache.org/jira/browse/TWILL-61?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16392215#comment-16392215
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Terence Yim commented on TWILL-61:
----------------------------------
There are two ZK nodes involved that fails the second attempt
# The {{/[appName]/[runId]/runnables}} persistent node. We create ignore the
node exists exception on creation.
# Kafka fails to create the ephemeral node for the broker id
{noformat}
Caused by: java.lang.RuntimeException: A broker is already registered on the
path /brokers/ids/1. This probably indicates that you either have configured a
brokerid that is already in use, or else you have shutdown this broker and
restarted it faster than the zookeeper timeout so it appears to be
re-registering.{noformat}
> Second launch attempt of AM always failed
> -----------------------------------------
>
> Key: TWILL-61
> URL: https://issues.apache.org/jira/browse/TWILL-61
> Project: Apache Twill
> Issue Type: Bug
> Components: yarn
> Reporter: Terence Yim
> Assignee: Terence Yim
> Priority: Major
> Fix For: 0.5.0-incubating
>
>
> YARN would make multiple attempts to launch an application. Currently second
> or above attempts would always fail due to creation of /runId/state node in
> ZK fail (node exists) because runId is generated on client side and doesn't
> change between attempts.
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