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https://issues.apache.org/jira/browse/TEZ-3036?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15097108#comment-15097108
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Jason Lowe commented on TEZ-3036:
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Haven't verified this, but I suspect this can be replicated by simply
hardcoding the WebUIService to throw an exception like ClassNotFoundException.
> Tez AM can hang on startup with no indication of error
> ------------------------------------------------------
>
> Key: TEZ-3036
> URL: https://issues.apache.org/jira/browse/TEZ-3036
> Project: Apache Tez
> Issue Type: Bug
> Affects Versions: 0.7.0
> Reporter: Jason Lowe
> Priority: Critical
>
> I've seen a couple of instances where the Tez AM fails to complete the
> startup sequence. It never gets around to registering with the
> ResourceManager, so the RM eventually times out the attempt and starts
> another. The subsequent attempts do the same. There are no indications in
> the logs that anything is wrong, rather it just seems to get stuck during
> startup then a bit over 10 minutes later is killed.
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