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https://issues.apache.org/jira/browse/AMBARI-15795?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sumit Mohanty resolved AMBARI-15795.
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Resolution: Fixed
> Parallel execution should only be allowed on commands that have auto retry
> enabled
> ----------------------------------------------------------------------------------
>
> Key: AMBARI-15795
> URL: https://issues.apache.org/jira/browse/AMBARI-15795
> Project: Ambari
> Issue Type: Bug
> Components: ambari-agent
> Affects Versions: 2.2.2
> Reporter: Sumit Mohanty
> Assignee: Sumit Mohanty
> Fix For: 2.2.2
>
> Attachments: AMBARI-15795.2.patch, AMBARI-15795.patch
>
>
> Parallel execution of commands can result in failures if the commands process
> resources that are shared among the commands. For example, commands may check
> and delete the same file resource. Deleting a file resource that is already
> deleted is not a functional error but its does result in command failure.
> Its not always possible to guarantee that stack scripts are written with
> guards that can check the failure and then determine if its harmless or not.
> Auto retry is a way to get around failures due to resource contention - think
> eventual success. Try all commands in parallel - then try only the failed
> ones. Each command is idempotent by definition so after a few retries all
> commands succeed.
> When commands without auto-retry option are executed in parallel then there
> is no option to retry. This is not desirable.
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