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https://issues.apache.org/jira/browse/AMBARI-13245?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Nate Cole resolved AMBARI-13245.
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Resolution: Fixed
> RU cluster in hung state while trying to perform downgrade
> ----------------------------------------------------------
>
> Key: AMBARI-13245
> URL: https://issues.apache.org/jira/browse/AMBARI-13245
> Project: Ambari
> Issue Type: Bug
> Components: ambari-server
> Reporter: Nate Cole
> Assignee: Nate Cole
> Priority: Critical
> Fix For: 2.1.2
>
>
> The recently added {{Parallel}} class has a default thread timeout that is
> too low. As a result, EclipseLink code is deadlocking and preventing queries
> from executing.
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